HP LaserJet Classics II_III

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LaserJetSeries!1PriiTter [HP 33440)andLaserJetillPrinter(HP33449)CombinedServiceManual

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HP Part No. 33449-90906Printed in USA

First Edition - February 1990,,

HP DOC

Back to Welcome
http://../Welcome.pdf


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NoticeHEWLETT-PAC- MA~S NO WARRAN~ OF ~ ~ND ~TH REGARD TO T~S~TERM, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED W~TIES OFMERCMTABILI~ AND FIT~SS FOR A PARTICULAR PURPOSE . H ewlet t -Pa cka rd sha llnot be liable for er r or s con t a in ed her ein or for in cid en t i con sequen t ia l d amages in connect ionwit h t h e fu r nishing, per formance, or u se of t h is ma t er ia l.Th is documen t con t in s p rop riet a r y in forma tion wh ich is p rot ect ed by copyr igh t . Ml r igh t s a r er es ewed. No pa t i of t h is documen t may be phot ocopied, r epr odu ced, or t r an sla t ed t o a not herlanguage withou t the p r ior writ t en consen t of Hewle ti-Packard Company.Th e in forma t ion con tin ed in t h is documen t is s ubject t o ch an ge wit hou t n ot ice.

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@ Copyr igh t 1990 Hewle ti-Packard Company


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HP 33440/HP 33449 COMBINED PRINTERREADERS COMMENT SHEET

SERVICE MANUAL

P lea se @ve u s you r commen t e concer n ing th is manua l. You r con st r u ct ive cr it icism will h elp u scr ea t e bet ir manua ls in t h e fu t ur e. Be a s specific a s pos sible, giving sect ion and page r efer en ceswher e app rop ria t e. Commenb on th e wr it ing, gr aph iw, binding, s ize, and p rin t ing method a r ehelpfu l ~n -m~ng ou r manua ls mor e u sefu l and fr iendly.If you wot id lik e a r eply, be sur e t o in clude you r name and add res sw it h you r r espon se.for your feedback. , Thank you

Februaw 199033W9-90906


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...11111~:NO POSTAGE :NECESSARY :lF~l~DIN TNEUN~D STA=S !BUSINESS REPLYMAILFIRST CLASS MAIL PERWT NO. 141 SOISE, IDAHO

POST~E WILL BEPAIDBY ADDRESSEE

Hewlti-Packard CompanyBoise DiWsionAtin:Learning Produc@ M.S. 517P.O. Box 15Boise, Idaho 83707-99W


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Printing HistoryTh is manua l wa s cr ea t ed u sin g HP Tagflectra sot ia re on a n HP Vect ra P er son al Compu ter . Th ebody t ed is pr in ted in Centu~ Schoolbook fon ts , a nd ch apt er a nd s ect ion h eads a re pr in t ed inHelvet ica fon ts. Th e camer a -r ea dy copy wa s pr in t ed on an HP La ser J et III pr in t er a nd r epr odu cedusing standard offset pr in t ing.Hr s t E d it ion - F eb r u a ~ 1990

Trademark creditsPCL is a r egis ter ed t r adema rk of Hewlet i-Packa rd Company. Resolu t ion Enhancemen t isa t r ademark of Hewle t t-Packard Company. PostScript is a r egis ter ed t r adema rk of AdobeSyst ems, In c. in t he U .S . a nd ot h er cou nt r ies . HP Vectra Per sona l Computer is a pr odu ct ofHewlet t -Packa rd Company. lBM is a r egis t er ed t r adema rk of I nt~r n at iond Busin es s Mach in esCorporation.

This manual uses the following convent ions :CoIor in dim t es t e~ or gr aph ics t h at is s pecific t o t he La ser J et III (HP 33449) pr in ter . Color mayd so be u sed for emphasis , t it ies , and oth er non -HP 33449-specific ma t er ia l.Th e n ames of ma jor pr in t er pa fis a nd a ss emblies a r e ca pit iized.Bold is u sed for emph a sis , pa t i i cu l a r l y in s it u at ion s wher e it a lic me wou ld be con fu sin g.I ta lic type is u sed to indica t e r ela t ed documen t s or for emphasis .COMPUTERt ype in dica tes t et i visible on t he pr in ter s displa y or commands a s seen on a PCterminal.[-] indicates keys, such as (=], on the pr in ter s Cont rol Panel or on a computerkeyboard.Note Not es con tin impot in t in forma tion set off fr om t he t et i.,!

*Caution Caut ion mes sa ges a ppea r befor e or t ier pr ocedu r es wh ich , if n ot obsemed, cou ld

@r esu lt in loss of da ta or in damage t o equ ipmen t.

Warning Warning messages signal a specific procedure or practice which, if not followedB

Mcorrectly, could cause personal injury.

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contents1. P RODUCT INF oRm moN

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HP 33440/HP 33449 COMBINED SERVICE MANUAL

36. SELF TESTSGeneralTh ree t ypes of s elf-t es t r ou t in es , ot h er t ha n Ser vice Mode t es ts cover ed in t he n efi s ect ion , mn beper formed on t he HP 33440 and HP 33449 pr in ter s. Th es e s elf-t es t r ou t in es a res 05 SELF TEST.s 04 SELF TEST.H 15 ENGINE TEST (Test P rin t).

05 SELF TESTEach t im e t he pr in ter is power ed on or t he Con tr ol P an el [PRINT FONTS/TEST) key is h eld down for2-t o-5 seconds , 05 SELFTESTis d isplayed . (I f t h e key is h eld down longer , 04 SELFTESTwiH bed isplayed .) The p rin t er will t h en execu t e a self t es t t h a t ver ifies oper a t ion in t h e following a r ea s:s Program ROM.s I nt er n al Fon t ROM.E RAM on the I nt er fa ce/Format ier PCA and any op tiona l (a cces sor y) RAM PCAS.E DRAM Cont rolle r.N In ter face/Format ter logic.s Ml LEDs.If t h e seU te st was exp licit ly invoked , va lu able in format ion abou t p age coun~ dat e codes , andcon figu ra tion s elect ion s mn be obt in ed fr om the fir st por tion of t he r es ult in g pr in tou t. Th ein forma tion is summar ized in F igu re 3-7 for t he HP 33440 a nd in F igu re 3-8 for t he HP 33449.When t he pr in t er is fir st swit ch ed on , on ly t he n on -pr in tin g por tion of t he s elf t es t is per formed.A self t est m ust be r equ est ed fr om t he Con tr ol P an el or t hr ough a n Cz comma nd t o get aself-t es t pr in tou t . When t he pr in t in g por t ion of t he self t es t begin s, t he mes sa ge 06 PRINTINGTEST is dis pla yed. Th e s elf t es t maybe abor ted by pr es sin g t he [~] (cONTINuE/REsETj, or(PRINT FONTS/TESTj k eys. Th e numer ic por t ion of t he mes sa ge will fla sh wh ile t he s elf t es t is bein gaborted.~Q~~ The s elf t es t is pr in ted in t he defa ult media s ize in t he defa ult or ien ta t ion . Th e

Q HP 33440 self-t es t p rin t ou t is an example of 12% prin t cover age (s ee F igu r e 3-7).P,,P~.) Th e HP 33449 s elf-t es t pr in t ou t is a n example of 10% pr in t cover age (s ee-.~,.. F igu re 3-8). Th is m ay be u sefn l a s a r efer en ce in det ermin in g t on er u se. A t ypica lEP-S Ca rt ridge sh ou ld h ave a dequ at e t on er t o pr in t 4000 sh eet s of pa per a t a n

average 5~0 coverage.

Self-Test Printout InformationThe Self-Tes t P r in t ou t con t in s va lu able in forma tion such a s page coun t, firmwar e da t e codes ,Con t r ol Panel s et t in gs , and any in st iled op tion s.

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HP 33440/HP 33449 COMBINED SERVICE MANUALHP 33440 Self Test PrintoutThe number ed it ems below r efer t o F igu re 3-7.1. P age Cou nt i Sh ows a ppr oxim at ely h ow man y pa ges h ave been pr in ted over t he We of t hepr in ter . P age cou nt ca n be u sed t o det ermin e wh en t o ch an ge t he ozon e filt er a nd t o t ra ckpr in ter usage. The page count is cur ren t a s long a s the pr in ter is powered on. men t hepr in t er is power ed off, t h e page count is r ou nded down t o t h e n ea r est t en -pa ge in cr emen t a ndrecorded in non-volatfle memory.

2. Da te Cod-: Sh ows P rogr am ROM and Int er na l F on t ROM da te codes ~D).3. Au to Con tin ue: Sh ows Au to Con tin ue set tin g.4. I&led Memo= Shows tot i amount of ava ilable memo~.5. Spbol Set i Shows select ed symbol set .6. P rin tin g Menw Sh ows select ed P rin tin g Men u it em s.7. Cot il~t ion Menw Shows selected Confi~ra t ion Menu items.8. Sample P rin ti Sh ows r ipple pr in t pa tier n. Th is a rea is u sefu l for ch eckin g pr in t den sit y a ndqutity.

k ;age Coun t=97 Orogram ROMDatecode=198612 03, Int er na l F on t ROMDa tecode=lsAu to Con tin ue= OFFIn st alled Memor y=4608 Kbyt esSymbol Set= IBM-US.t enu I tems :Copies=l, Manual Feed=OFF, Font Source=I, Font Number=OO,Form=60 LinesPara llel 1/0!ll#$%&f o*+,- . /012 3456789: ; ?@ABCDEFGHIJKLMNOPQRSTU~XYZ[.!l!#$%&~()*+, -.\ o123456789:-#$%&()* +,-. \ Ol23456789. , s=>? @ABCDEFGHIJ KMOPQRSTwXYZ[\

@o. ;? @ABcDEFGHIJKwoPQRsT~xYz [ \ 19 #$%&()*+,-4 ./0123456789 : ;? @ABcDEFGHIJKWOPQRST~XYZ [\ 1~$%&()*+, -.\ Ol23456789: ;? @ABcDEFGHIJKwOPQRS-XYZ [\ ] A%&'()*+, -./O123456789 :; ?@ABCDEFGHIJKWOPQRST~XYZ [\ ]A 1& () *+, -./Ol23456789 : ;? @ABCDEFGHIJKLMNOPQRSTWXYZ[\ ] _T:r () *+r-. /O123456789: ;? @ABCDEFGHTJKWOPQRSTWXYZ[\ ] _ al()*+,-./Ol23456789:; c=>?@ABCDEFGHIJKWOPQRSTWXYZ[\ ]A_abc)*+,-./Ol23456789 :;?@ABCDEFGHIJKWOPQRSTWXYZ [\ ]A_abcc*+,- ./0123456789:; ?@ABCDEFGHIJKLMNOPQRSTWxYZ[\ ]A ~abcdc+,-./0123456789: ; abcdel?@ABcDEFGHIJKWOPQRSTmxyz [\ l~_

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HP 33440/HP 33449 COMBINED SERVICE MANUALHP 33449 Self Test PrintoutThe number ed it ems below r efer t o F igu re 3-8.1. P rin tin g Menm Shows t he cu rr en t P rin tin g Menu select ion s in t he or der t ha t t hey a ppea r int he Con t rol P anel dis pla y. U se t h is in forma t ion t o ver ify t ha t t h e s elect ion s a r e a ct ive in t hePr in t ing Menu .

2 . Cot ilgn ra tion Menw Sh ows t he cu rr en t Con fi~ra tion Menu select ion s in t he or der t ha t t heya ppea r in t he Con tr ol P an el displa y. U se t his in forma tion t o ver ify h ow t he pr in ter is set u p t ocommunica te with the computer .

3. W Size: Shows how much memory is in st iled in the pr in ter . 1024 ~ytes of inst iledmemor y is st an da rd wit h t he pr in ter . If opt ion al m emor y boa rds h ave been in st iled, a self t estca n be u sed t o ver i~ t ha t t he boa rds a re in st iled pr oper ly.

4. Page Counti Shows appr oxima tely h ow many pages h ave been pr in t ed over t he life of t hepr in ter . P age cou nt ca n be u sed t o det ermin e wh en t o ch an ge t he ozon e filt er a nd t o t ra ckpr in ter usa ge. Th e page coun t is cu rr en t a s long a s t he pr in ter is power ed on. When t hepr in t er is power ed off, t he page count is r ou nded down t o t he n ea r est t en -pa ge in cr emen t a ndrecorded in non-vola t i le memory.

5. Da te Codes a nd In st alled Devices: Shows fir mwa re an d in ter na l font da te codes~MDD) as well as inst iga t ion of car t r idges and media t ray size.

6. Sample P rin ti Sh ows r ipple pr in t pa tt er n. Th e r ipple pr in t pa tt er n (a lwa ys in Cou rier for t heHP 33449) a nd t he a rea s a t t he t op a nd bot iom of t he pa ge a re u sefu l for ch eckin g pr in t den sit yand qua lity.

7. Sca la ble Typefa ces: Demon st r at es t he pr in ter s a bilit y t o pr in t wit h s ala ble t ypefa ces.8. Gr aph /P ie Ch at i Th e ba r gra ph a nd pie ch ar t t est t he pr in ter s HP-GL/2 vect or gr aph icsca pabilit y. (Th e 3370por tion of t he pie ch ar t ds o s er ves a s a ch eck on t h e Resolu tionEnhancemen t qua lit y and p roper adju stmen t - s ee F igu r e 3-4.)

9. P at ter ns: Use t he sh adin g a nd cr ossh at ch pa tt er ns in t he blocks a t t he t op a nd bot tom of t hepa ge a s well a s in t he ch ar ts t o ch eck pr in t den sit y a nd qu alit y.

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o$_aI

S EL F T ES T

[

PRINTING mm:CWIES =1FW1 WCE = 1 (, terml)FwT WER =0PAPER = LETTERWI ENTAT 1~ = P (Portrait)FmM = ~ LINESWNUAL FEED = OFFS!m *1 = RWN-8

CMFtW1lW MM:Nlo ml = OFF110 = =RIAL=RIAL = RS-Z2W RATE = lEOORWST XW = OFFDTRWITY = Mlml = DmKPAEPRMEC1 = LIR

Rm size:3DnK WtwPaw c-t: Woimare Datmti 1~25r.te_l Fmt D,C*: 1m3aFmt Ca,trlxaImt.lld: NWEPam, Tray: LETTERCDEFGEIJmOPQRST~XYZ [ \ ] _l abc4efghi jkkopqrstu~z{ I }~1 ~C#$%&q ( ) q+, -. /a~EFGEI~WOPQ-T~YZ [\]_~abcaafghijk-opqrstumz {I}~1 *#$%&f()q+,-.101DEFGEIJ=OPQRST~z [\1_*tic4afghijklmopqrstu~c{ I}~!t8#$%&z ()q+,-. /012

/ /

Figure 3-8. HP 3344905 SELF TEST Printout

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HP 33440/HP 33W9 CQMBIWD SERVICE MANUAL04 SELF TESTHold ing down the (PRINT FONTS/TEST) key un til 04 SELFTESTis d isplayed (abou t 5 seconds ) willca use a con tin uou s self t est t o be r un u sin g t he 05 SEW TEST pr in tou t pa ge. Th e con tin uou ss elf-t es t mode is a good way t o t es t t he paper pa th s in ce it on ly t es ts t he elect r on ics on ce wh ilecon t inu ing to p rin t ou t t h e self-t es t page. P r es sing th e PRINT FONTS/TEST )) -, or(CONTI NUE/RESET) k ey t erm in a tes t h e con tin uou s t es t mode. Th e numer ic por t ion of t he mes sa gewill fla sh wh ile t h e self t es t is bein g abor ted.Note Bemuse of t he complex gr aph ics on t he Self-Tes t pa ge, pr in tin g speed for t he HP

33449 t il be les s t h an th e fu ll eigh t -p age-p er -m inu te r a t ed level.

Test Print (15 ENGINE TEST)Act iva t in g t h e TEST PRINT swit ch a cces sed by in ser t in g a pen or pen cil in t o t he h ole on t h elower r igh t side of t he pr in ter (F igu re 3-9) (beh in d a cover pa nel on t he HP 33449) ca uses apa ge of ver tid lin es (sh own in F igu re 3-10) t o be pr in ted. Wh ile pr in tin g, t he displa yw ill r ea d15 ENGINETEST.Th is is an en~ne t es t on ly s in ce t h e I nt er fa ce PCA is complet ely bypa ssed topr odu ce t h is pr in t . It is u sefu l t o ver ify pr oper oper a tion of t he DC Con t roller cir cu it r y a nd a llother p r in t engine componen t s (i.e ., eve ryth ing bu t the In ter face /Format ie r PCA). Hold ing downth is but ion will p roduce con t inuou s pages un til t h e bu t t on is r elea sed .

Figure 3-9. Selecting the Test Print Switch (HP 33440 shown here)

f 1

Figure 3-10. Portion of Test Print Pattern

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3-7. SERVICE MODEGeneralSer vice Mode sh ou ld on ly be u sed by s er vice r epr es en ta t ives . It et is ts t o a llow t he page count(wh ich mea su res t he life of t he pr in t en gin e) t o be r eset in t he even t t he In ter fa ce PCA is r epla ceda nd t o pr in t a t est pa tt er n wh ich is u sefu l for pr in t qu alit y a na lysis.Note F or t he ~ 33449, Ser vice Mode m essa ges a re n ot lodzed (except for cet inmes sa ges, su ch a s 05 SELFTEST,wh ich a re u sed in bot h u ser a nd Ser vice Mode).

Using Service ModeTo access Service Mode1. Hold down the (-j, the [CONTINUE/RESET], a nd t he ENTER/RESET MENU keyss imu lt a neou sly for a t lea st on e s econd wh ile power in g on t he pr in t er . Th is in t er r upt s t henorma l in it ia l non -p rin t ing self t es t . If Ser vice Mode ha s been p roper ly select ed , t h e d isplay willbe bla nk a nd dl fou r LEDs will be illumin at ed.

2. P r es s t he (CONTINUE/RESET) key on ce on ly. Th en pr ess t he (ENTER/RESET MENU) key.3. The d isplay will r ead SERVICEMODE (not iodized) a nd dl fou r LEDs on t he Con tr ol P an el wills t il l be i lluminated.

Note Any a t t endance message , such as 16 TONERLOW,win over r ide the SERVICEMODEPI dis pla y. However , t he pr in t er is .in s er vice mode a t t h is t ime if t h e pr ecedin g

w steps were per formed.

4. Mthough t he pr ocedu res a r e es sen t ia lly t he same, t im in g for t he HP 33440 and HP 33449 differa t t h is poin tHP 33440 ~er fr om 5 t o 30 secon ds, depen ding u pon in st iled m emor y, 05 SELFTEST

will be displa yed a nd dl fou r ligh ts on t he Con tr ol P an el will t ur n off. Aft erabou t five seconds, 02 WARMINGUPwill be br ie fly d isplayed, a ft er which thepr in ter wil l again display SERVICEMODEand the ready indica tor (only) wil lilluminate.

HP 33449 ~er less than one second, 05 SELFTEST(not iod ized ) will be displayeda nd dl fou r ligh ts on t he Con tr ol P an el will r em ain lit for u p t o 60 secon ds,depen din g u pon in tiled memor y, t hen t ur n off for a bou t 10 secon ds, a ft erwhich the p r in ter will aga in d isplay SERVICEMODEand the ready ind ica tor(only) till illuminate.

If t he self t es t fa ils, t he pr in ter will dis pla y t h e s ame er ror mess age t h at it n orma lly wou ld.5. To exit Service Mode for either pr in ter , press either the (~j or the ~~] key. Toreturn the HP 33440 on line, the [-) key must be pressed again .

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HP 33440/HP 33449 COMBINED SERVICE MANUALSelf TestsSever a l s elf t es t s mn be per formed in Service Mode1.

2.

3.

4.

HP 33449 only Press the (PRINT FONTS/TEST) key h per form t he pr in tin g por tion of t he se~t es t. 05 SELFTESTis dis pla yed (lodzed for HP 33449) a nd a s elf-t est pr in tou t is pr odu ced.For bot h pr in t er s, h oldin g down t he (PRINT FONTS/TEST) key un t il 05 SELFTESTis displayed(a bou t two s econds) ca us es t he forma t ier t o fir st per form a self t es t. Du rin g t he pr in t in gpor t ion , 06 PRINTINGTEST (lowed for HP 33449) is dis pla yed and a Ser vice Mode s elf-t es tp rin t ou t is p roduced. The p rin t er will t h en aga in d isplay SERVICEMODE.F igu re 3-11 sh ows asample of the Service Mode self-t e st p r in t .Th e (PRiNT FONTS/TESTj key mn dso be u sed t o r un con tinu ou s Ser vice Mode se~ t est i byh oldin g down t he key u nt il 04 SELFTEST (iodized for HP 33449) is displa yed. ~er sever alseconds, the p r in ter will begin con t inuous ly p r in t ing the Service Mode pr in tou t .To abor t the self t est press the (~) key onc~ th is@ return the pr in ter to Service Mode.S ever al a ddit ion d pages maybe pr in t ed t o clea r t he bu ffer , du rin g wh ich t ime t h e 04-por t ion oft h e message will fla sh .

s,= 1111I 1111== :...:.:,.:::f:,= 1111u 1111= M;&%i2a%*mm gm~ ; ~ 1: ==wf~~%..............7s.%>...:.w..............i*.fY.,.,,:>w


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HP 33440~P 33449 COMBINED SERVICE MANUALSetting the Page CountThe pwe coun$ which is st or ed in non-vola t ie W and displayed on the self-test Pfintout,r epr es en ts t h e n umber of pa ges wh ich h ave been forma t ied by t he pr in t er . If it becomes n ecess a~t o in~ a new Inter fa ce P CA, t he page count should be set t o reflect the page count (age) of thep rin t engin e. To set t h e page coun t, en t er Ser vice Mode and per form the following p rocedu r e:1. Befor e r emovin g t he old In ter fa ce PC~ ver ify t he cu rr en t pa ge cou nt of t he pr in ter . Th is ca nbe don e by execu tin g a 05 SELF TEST (befor e en ter in g Ser vice Mode) or , for t he HP 33449, bypress ing the (PRINT FONTS/TEST) key wh ile in Ser vice Mode. Th e pa ge cou nt ca n be fou nd ont he fir st lin e of t h e pr in t ou t for t he HP 33440 and followin g t he Con figu ra t ion Menu s et t in g fort he HP 33449.

Note If a 05 SELFTESTwill n ot execu te, t he page count ca n be ver ified by en ter in gPB Service Mode as descr ibed above. After en ter ing Service Mode, per form thew fo~owing steps:

s

9Press the ~=j key.PAGES=X~ is displayed. ~ is the page count cur ren t iy stored inNVRAM.-The under lined charac~r denotes the cu r sor pos it ion .Recor d t h is n umber for fu tu re r efer en ce in s et t in g t he page count t ierin t iling the new PCA.

2.

3.

&er ver i~ng the page count of the old In t er face P C~ in st il the new PCA as descr ibed inChapt er 6.To store the page count in the Non-vola t ile RAM (~) on the new Inter face PcA, per formthe following steps:w Mer enter ing Service Mode, press the ~=] key.s PAGES =XXXXXX is displayed. XXXXXX r epr es en t t he digit s for t he page count cu rr en tlystor ed in ~. The under lin~d chara cter denot es t he cursor posit ion .

w Using the Q or ~ keys, select the desired value for the under lined digit and pr ess (~).Th e cu rsor will a ut omat idly move on e digit t o t he r igh t.

s Set ea ch digit in t he same m an ner . When t he find va lue ha s been en ter ed, t he pr in ter willa ut oma tidly r et ur n t o Ser vice Mode.

Note Th e pa ge cou nt is a ccu ra te (cu rr en t) a s lon g a s t he pr in ter is power ed on . Wh en,8 t he pr in ter is swit ch ed off, t he pa ge cou nt is r ou nded down t o t he n ea rest 10w in cr emen t a nd r et a in ed in ~. Th is m ea ns t ha t t he pa ge cou nt n umber m aybe off by u p t o n in e pa ges ea ch t im e t he pr in ter is swit ch ed off.

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PREVENTIVEMAINTENANCE

4. PRm~ WmN~CE4-1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . .4-2. LIFE ~ECTANCY OF CONSUMABLES AND REMTED PARTS .4-3. MNTENANCE CHEC~OINTS .4-4. CLE~NG THE PRINTERGenera l . . . . . . . . .Transfer Guide . . . . . . .Tr an sfer Cor on a Assembly . .Regist ra t ion Assembly . , .Feed Guide Assembly . . . .Fusing Assembly . . . . . .Fuser Separa t ion Pawls . .

Beam-To-Drum Mir ror . . .P r imary Corona . . . . . .4-5. CLEWNG PAPER J AMSPaper P ickup Area . . . . .Transfer Guide Area . . . .Fusing Assembly Area . . .

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. .4-7. FUSER CLEANING PAD REPLACEMENT .4-8. EP-S CARTMDGE HFE AND USE . . . .Ct idge Life . . . . . . . . . . . . . . .16 TONER LOW Message . . . . . . . . .4-9. PRINT DENSITY ADJ USTMENT . . . . .

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4-34-34-44-54-54-54-64-74-74-84-84-94-1o4-114-114-124-124-134-144-154-154-154-16

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Figures

4-1. Main tenance Checkpoin t s.. . . . . . . . . . . . . . . . . . . . . . . .4-2. Clea ing the Transfer Guide.. . . . . . . . . . . . . . . . . . . . . . .4-3. Cleaning the Transfer Corona Wire . . . . . . . . . . . . . . . . . . . . .4-4. Cleaning the Regist ra t ion Assembly . . . . . . . . . . . . . . . . . . . .4-5. Cleaning the F eed Guide Assembly . . . . . . . . . . . . . . . . . . . . .4-6. Cleaning the F using Assembly . . . . . . . . . . . . . . . . . . . . . . .4-7. Cleaning the Beam-to-Drum Mir ror . . . . . . . . . . . . . . . . . . . .4-8. Cleaning Brush Lomtion . . . . . . . . . . . . . . . . . . . . . . . . .4-9. Cleaning the Pr imary Corona Wire in the EP-S Car t r idge . . . . . . . . . . .4-10. Paper Pathand J am Areas . . . . . . . . . . . . . . . . . . . . . . . .4-11. Clea r ing J ams in t he Paper P ickup Area . . . . . . . . . . . . . . . . . . .4-12. Clea r ing the Transfer Guide Area . . . . . . . . . . . . . . . . . . . . . .4-13. Clea r ing the Fusing Assembly Area . . . . . . . . . . . . . . . . . . . . .4-14. Ozone F ilt er Replacement .. . . . . . . . . . . . . . . . . . . . . . . .4-15. Repla t ing the Cleaning Pad . . . . . . . . . . . . . . . . . . . . . . . ,4-16. Dist r ibu t ing Toner in the EP-S Car t r idge . . . . . . . . . . . . . . . . . .4-17. Adjust ing P r in t Density . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

4-44-54-64-74-74-84-94-1o4-1o4-114-114-124-124-134-144-154-16

4-1. Sefice Life of Consumables. . . . . . . . . . . . . . . . . . . . . . . . 4-3

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HP 33440/HP 33449 COMBINED SERVICE MANUAL4?. INTRODUCTIONVer y lit ie r ou t in e oper at or main ten an ce is r equ ir ed for HP 33440 and HP 33449 pr in t er s. Mos tmain ten an ce a nd adju stmen t pr ocedu res a re ca r ried ou t on ly when t he EP -S Ca rt r idge is ch an gedor t her e is a pr in t qu alit y or pa per feed pr oblem . Sin ce t he main ta in able pa rt s of bot h pr in ter s a res im ila r , t h e HP 33440 ha s gener a lly been u sed for illu st r a t ion .Note Ml rou t in e ma in t en ance and adju stmen t s a r e t h e cu st omer s r espon sibilit y. Mos tof the following procedu res a re included for r efe rence on ly.

4-2. LIFE EXPECTANCY OF CONSUMABLES AND RELATED PARTSThe expect ed s er vice live of con sumables a nd r ela t ed pa r ts is given in Table 4-1. Nways in spectthese componen t s for wear when servicing the p r in ter . The expected-service -life est ima tes a reba sed on A4 or let ter size pr in ts wit h a n a ver age of 5 per cen t t on er cover age a t a den sit y dia ls et t in g of 7. The con t r ol p anel s elf t es t p rin t ou t p roduces approxima t ely a 12 percent coveragefor t he HP 33440, 10 per cen t for t he HP 33449.

Table 4-1. Service Life of Consumables

EP-S Car t r idge* 1

Cleaner Pad* 1

Separa t ion Pad I 1

Approximately 4000 pages(application dependent).Open : 6-me. shelf life.Unopened : 2-yr . shelf life .L ife of EP-S Car t r idge.

RocMng the ca r t r idge whenTONERLOWappea r s mayprolong catir idge life.Included with EP-SCartridge.

100,OOO**100,OOO**or anytime theSepara t ion Pad is r ep laced.100,OOO**or anfiime FeedRol ler Assembly is replaced.50,000**100,OOO**

*Cus tomer respons ib ility. **Es t ima ted , see note below.***HP respons ibility on ear ly HP 33440s .

Note The 100,000-page componen t service life i s ONLY AN ESTIMATE. The serviceP i life of con sumables is dir ect iy r ela ted t o t he t ype of media u sed a nd t he t ype of@ prin t ing be ing done. The Fus ing Assembly, Feed Rolle r Assembly, Separa t ionPad, and Tr ans fer Corona Assembly shou ld be in spect ed for exces sive wea r and

r ep la ced if n eces sag whenever a p rin t er is being ser viced .

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43. MAINTENANCE CHECKPOINTSP rin cipa l m ain ten an ce ch eckpoin t for t he HP 33440 a nd HP 33449 pr in ter s a re ~u st ra ted inF igu re 4-1 below. Sin ce t he pr in t er s a r e qu it e s im ila r , t he HP 33440 h as been u sed for illu st r at ionhere.

EP.S Catidge

ozone Ffi*r, * * 1111 FeedhUer Asembly & SePmt ion Pad *

1111 II ,...,,.,. , s,,,.,,.. W,y.1,Sm. . . . . .

ILwer [Sopmpyl Removeacmmlaed debris.De!,vev alcoholG,de

*Rqlace eve~ 100,~ pag~.**Replm evey 50,000pagw.

Figure 4-1. Maintenance Checkpointscaution Do not clean wit h -or expose r ubber r oller s or ot h er r ubber ized par t s t o-isop ropyl

*a lcoh ol. Do not u se ammot ia -ba sed clea nin g pr odu t i or t he EP -S Ca r tfidge dr ummay be permanen t ly damaged.

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4-4. CLEANING THE PRRNTERGeneralIf r edu ced pr in t qu alit y occu r s, clea n t he in side of t he pr in t er by wipin g any visible t on er awaywith a damp cloth . I tems th a t a r e color ed gr een a r e u ser -a cces sible for clean ing.Note Ton er is a n on t ot ic su bst a nce composed of pla st ic, ir on , a nd a sma ll amountof pigmen t. Ca re s hou ld be t a ken t o a void br ea t hin g t on er p ar t icles . To clea n

t on er fr om skin a nd clot hin g, r emove a s much t on er a s p oss ible wit h a va cu umor dr y t issu e wipes, t hen wa sh t he t on er fr om sk in or clot hin g wit h cold water.Hot wa ter m ay mak e t on er ver y difficu lt t o r emove. Beca use t on er t en ds t o bedegraded by vinyl ma ter ia ls , con tact with vinyl shou ld be avoided .

Th er e a re seven pr ima ry a r ea s of t h e pr in t er wh ich sh ou ld be k ept clea n:1. Tr an sfer Gu ide. 5. Fus ing Assembly.2. Tr ans fer Corona Assembly. 6. Beam-to-Drum Mir ror .3. Regis t r a tion Assembly. 7. P r ima ry Corona .4. F eed Gu ide Assembly.

caution Th e pr in t er mus t be t ur ned off pr ior t o clea nin g.

Transfer GuideWipe th e Tr ans fer Guide (s ilve r s t r ip , see Figu re 4-2) clea n wit h a damp clot h (use water only).

Figure 4-2. Cleaning the Trans fer Guide

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HP 33440/HP 33449 COMBINED SERVICE MANUALTransfer Corona AssemblyTo clean th e Tr an sfer Corona Assembly1.2.

3.4.

5.

Swit ch t h e p rin t er OFF and open t he Top Cover Ass embly.Dip a cot t on swab in isopr opyl a lcoh ol. Wa t er a n be u sed if is opr opyl a lcoh ol is n ot a va ila ble.M&e sure the mab is not dr ipping.Ca re~y clea n t he Tr an sfer Cor on a hou sin g, r emovin g a s much t on er bu ildu p a s pos sible.Wit h a dean swab and is opr opyl a lcoh ol (or wa ter ), gen tiy wipe t he Tr an sfer Cor on a wir e (seeF igu re 4-3) wit h t h e cot t on swab unt il n o r esidu e r ema in s.Wit h t he br ush -en d of t he gr een clea nin g br ush , r emove any debr is a ccumu la t ion s a rou nd t hesh ar p r ow of st at ic t eet h on t he ou tpu t side of t he Tr an sfer Cor on a (see F igu re 4-3).

Caution Be m refu l n ot t o br ~ t he m on ofilamen t t in es t ha t cr oss dia gon dly a bove t he

#T~sfer Cor on a wir e. Aso, be ca refil not t o get a lcoh ol on a ny r oller s or pla st icparts.

Figure 4-3. Cleaning the Transfer Corona Wire

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HP 33440/HPRegistration AssemblyRemove any deb ris from the Re~st r a t ion Assemblys cover .

33449 COMBINED SERVICE MANUAL

Llfi t h e cover of t h e Re#s tr a t ionAssembly (see F i~r e 4-4) a nd wipe off a ny pa per du st u nder nea th t he a ssembly cover wit h adamp cloth (u se wa t er on ly).

Feed GuideWipe t he F eed

Figure 4-4. Cleaning the Registration AssemblyAssemblyGu ide As sembly (s ee F i~r e 4-5) wit h a dampen ed clot h (u se wa ter on ly).

Figure 4-5. Cleaning the Feed Guide Assembly

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HP 33440/HP 33449 COMBINED SERVICE MANUALFusing AssemblyPer iod id ly clean ing th e Fu ser Separ a t ion Pawls (claws ) (s ee F igu r e 4-6) will h elp p rolong th e lifeof the p r in ter s Fus ing Assembly.

warning The fusing area gets HOT. Also, be careful not to get toner on clothing; it maystain.

SeparationPawls

Figure 4-6. Cleaning the Fusing AssemblyFuser Separation PawlsTo clea n t he pawls :1.2.3.

4.

Tur n t he pr in ter OFF.Fu lly open th e Top Cover Assembly.P ush t he r ea r sect ion of t he F usin g Assembly (t he sect ion t owa rd t he r ea r of t he pr in ter ) fu llyopen . You will be a ble t o s ee t he fou r bla ck p la st ic Fu ser S epa ra t ion Pawls (claws) a lon g t helower edge of t he s ect ion ju st pu sh ed ba ck (s ee F igu re 4-6).Clea n t he t ip of ea ch pawl wit h a clot h dampen ed wit h wa ter . Avoid con ta ct wit h t he mainpor t ion of the Fus ing Assembly.

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Beam-To-Drum MirrorThe Beam-to-Drum Mir ror


can be ea sily d amaged . Norma lly, it can be cleaned by ca r efu llyblowing any deb ris off it s su rface.caution Newer a s semblies con t a in a fir s t sur fa ce mir r or (i.e., a m ir r or wit h it s r eflect ivecoa t in g on t he t op, or first, su rface) which can be eas ily damaged . Do not clean

the mirror un less absolu tely necessa~ (e.g., fingerpr in ts , water condensat ion , e tc.).

I f addit iond clean ing is r equ ir ed , p roceed as follows:1. Acces s t he Beam-t o-Dr um Mir ror , lom t ed under t he Top Cover As sembly, by movin g t h e Mir r orSh ut ter Assembly t o t he r igh t (fr eein g t he lever ) a nd swin gin g it u p a nd ou t of t he wa y (seeF igu re 4-7, ds o Mir r or Shu t ier As sembly in Ch apt er 6).

2. Car efn lly clean th e mir r or wit h a clean , lin t -fr ee wipe, dampened on ly w ith a cleaning flu idapproved for a camera lens.

Figure 4-7. Cleaning the Beam-to-Drum Mirror

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HP 33440/HP 33449 COMBINED SERVICE MANUALPrimary CoronaBemuse t he P rim ar y Cor on a is defica te, it sh ot id ody be clea ned wh en pr in t qu alit y begin s t odegrade (~idly, da rk ver t id st reaks on the page).

Caution Clean t he P r ima ry Cor on a wir e u sin g on ly t he pad-en d of t he clea nin g br ush@

pr ovided. U sin g a cot t on swab or ot her clea nin g t ool may br ea k t he wir e,r equir ing rep lacemen t of the EP-S Car t r idge .

1.2.3.4.5.

6.7.

Tu rn t he pr in ter OFF.Open the p r in ter s Top Cover Assembly.Remove t he EP -S Ca r tr idge fr om th e pr in t er .Lift ou t t he clea nin g bwsh , a s sh own in F igu re 4-8.Ca refu lly in ser t t he felt -t ipped end of t he br us h in on e en d of t h e EP-S ca rt r idge s lot , a s s hownin F igu re 4-9. (The br ush will fit on ly one wa y. Look ca re~y a t F igu re 4-9 for t he cor rect wa yto pos it ion the clean ing brush .)Slide t he bru sh ba ck a nd for th a few t im es t o dea n t he P rim ar y Cor ona wir e.Ret ur n t he br ush a nd t he EP-S Ca rt ridge t o t he pr in ter .

Figure 4-8. Cleaning Brush Location

Figure 4-9. Cleaning the Primary Corona Wire in the EP-S Cartridge

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45. CLEARING PAPER JAMSIf 13 PAPER JAM appea r s in t h e d isplay window, open th e p rin t er s Top Cover Assembly and lookfor jammed paper . P a per jams occu r main ly in t h e followin g t h ree a rea s:s Paper P ickup a r ea .s Transfe r Guide a rea .H Fusing Assembly a r ea .Th e t h ree a rea s in t he pr in t er pa per pa th men tion ed above a re illu st r at ed in F ign re 4-10 below:

Figure 4-10. Paper Path and Jam AreasPaper Pickup AreaOpen t h e Regis tr at ion As sembly cover a nd, if n ecess ar y, t a ke ou t t he paper t ra y t o r emove jammedpaper (see Figu re 4-11).Caution Do not a tiem pt t o pt il pa per t ha t h as jammed ba ck t hrou gh t o t he fr on t of t he

#1 pr in ter . Th is W r esu lt in dama ge t o t he Regist ra tion Assembly.$.ti,,

Figure 4-1 %.Clearing Jams in the Paper Pickup Area.

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HP 33440/HP 33449 COMBINED SERVICE MANUALTransfer Guide AreaOpen th e Regis tr a t ion Assembly cover (Tr ans fer Gu id e Lo&) and r emove jammed paper a s shownin Figu re 4-12.

Figure 4-?2. Clearing the Transfer Guide Area.Fusing Assembly AreaOpen t he r ea r door of t he F usin g Assembly a nd r emove t he jammed pa per (see F igu re 4-13). P ullt he sh eet ba ck ou t of t he fu ser (a s sh own ) t o pr even t con tam in at ion fr om unfised t on er .

Figure 4-13. C!earing the Fusing Assembly Area.

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4-6. OZONE FILTER REPLACEMENTOzon e is a color les s ga s gen er at ed by dl k ser p rin t er s a nd phot ocopier s. It maybe per ceived a spungen t t o t hose sen sit ive t o it s odor . The Ozone F ilt er , a cu st omer -r ep la ceable it em , r emovest h is odor . Th e fflt er sh ou ld be r epla ced ever y 50,000 pages . If t he pr in ter is bein g oper a ted in acon fin ed envir onmen t , it may need to be r ep la ced mor e ofien . Visua l in sp ect ion will not show thata filt er is dim , pa ge cou nt is t he on ly r elia ble in dlm tor on wh ich t o ba se a decision t o ch an ge afilter.On older HP 33440 pr in ter s, it m aybe n ecessa ry t o r emove t he Ozon e F ilt er Mou nt t o ch an get h e filt er . Unt il t he pr in t er is u pda ted, it is HP s r es pon sibilit y t o ch an ge t h e Ozon e F ilt er . Ont h ese models , t h e Ozon e F fit er Mount ca n be upgr aded t o a llow t h e filt er t o be ch anged wit hou tr emovin g t he mount . Refer t o Ser vice Not e 33440A-7 and t o Ch apt er 6, S ect ion 6-3.Cond it ions tha t may genera te ozone compla in t s a r e:s Mult ip le la ser p rin t er s and/or cop ier s in a con fin ed a r ea .s Extremely low rela t ive humidi ty.s Poor room vent ila t ion .s Pr in t er exhaus t por t d ir ect ed towa rd th e fa ce of p er sonnel.s Ozone Filt e r in poor cond it ion (i.e ., ove r 50,000 page coun t ).s Long, con t inuou s p rin t ing combined wit h any of t h e above.

Examine th e p rin t er s envir onmen t t o det erm ine if any of t h e p reced ing condit ion sexis t. It may be n eces sa ry for t he cu st omer t o t a ke cor rect ive a ct ion t o en su re t hep rin t er s envir onmen t is fr ee of condit ion s t h a t may gener a te an ozone compla in t .

To replace a user -replaceable fil ter :1. Th e Ozon e F ilt er is loca ted in t he h ou sin g on t he in ner r igh t side of t he pr in ter (seeFigure 4-14).

2. Swit ch pr in ter OFF a nd open t he Top Cover Assembly.3. Slide t he filt er ou t a nd r epla ce it wit h a n ew filt er .

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4-7. FUSER CLEANING PAD REPLACEMENTTo r epla ce t he Fu ser Clea nin g Pad1.2.3.4.5.6.7.

Open th e Top Cover Assembly.Open th e Fu sing Assembly top cover (gr een felt cover ).Remove e tis t ing clean ing pad (see WARNING below).U se t he felt en d of t he n ew clea nin g pa d t o wipe t he F usin g Assembly r oller .Disca rd t he felt en d of t he clea nin g pa d a nd in ser t t he n ew clea nin g pa d.Lower t h e Fu sing Assembly cover (it does not close t igh t iy).Close t he pr in ter s t op cover a nd t ur n t he pr in ter ON .

Warning The Fusing Roller gets HOT. Be sure to hold the Cleaning Pad by the green

@tabs as shown in Figure 4-15.

Figure 4-f5. Replacing the Cleaning Pad

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4-8. EP-S CARTRIDGE LIFE AND USECartridge LifeThe elect r ophotogr aph lc (EP-S ) ca r t ridge is a dean and conven ien t mean s of supp lying th econ sumable it em s n eeded in t he pr in tin g pr ocess. Wh en u sin g eit her t he HP 33440 or HP 33449p rin t er for t yp id word p roces sing app lica t ion s, an EP-S Ca r t ridge will p rin t app roxima tely 4000pa ges. H a ver age pa ge cover age is figh t (a t ypid pa ge of t et i h as a gr ea t ded of Wh it e spa ce),t h e EP-S Ca r t ridge shou ld la s t longer . If t h e app lica t ion r equ ir es a den ser page cover age (gr aph icsa nd forms, for em ple), t hen t he E P-S Ca rt ridge will n ot la st a s long.Th e fife of a n EP-S Ca rt ridge mn be emen ded by oper at in g t he pr in ter wit h t he pr in t den si~a dju stmen t did set on a h igh er n umber (for ligh ter pr in ts). See Adjust ing Prin t Densi ty on t hefollowing page. Mso, s ee Chapt er 2, Sect ion 2-3, for EP-S Ca r t ridge s tor age dat a .

Do NOT a tiempt t o r efill a u sed ca rt ridge. Damage t o t he pr in ter ca n r esu lt .

16 TONER LOW MessageThe 16 TONER LOWmessa ge in dim tes t ha t t he amou nt of t on er in t he E P-S Ca fidge is get tin glow, Wh it e st re~s will soon a ppea r on pr in tou ts. F or m tim um u sa ble E fe, r em ove t he E P-SCa rt ridge a nd r ot at e a rou nd it s lon g t is (see F igu re 4-16) t o dist ribu te t he r emain in g t on er .Mt hou gh t he 16 TONER LOWwa rn in g may s til be dis pla yed, t he fa deou t sh ou ld clea r u p a llowin gu p t o 100 mor e pa ges t o be pr in ted. If t he fa deou t con dit ion per sis ts , t h e EP-S Ca rt ridge must bereplaced.

Figure 4-16. Distributing Toner in the EP-S Cartridge

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4-9. PRINT DENSITY ADJUSTMENTP rin t den sit y r efer s t o t he r ek tive da rkn ess of t he pr in t on t he pa per . Den se pr in t a ppea rs ver ybla ck t it h a st igh tiy kauier look . Le ss d en se p rin t look s ligh t er , and sohd-filled a r ea s may not becompletely black.When pr in t den sivis set a t a low number, t in er is u sed a t a fa st er r at e, r edu cin g t he E fe of t heEP-S Ca rt ridge. P rin tin g wit h t he pr in t den sit y set t o a h igh er n umber is a good wa y t o con ser vet on er wh en da rk er pr in t is n ot n ecess ar y.To adju st p rin t d en si~:1. Open th e p rin t er s Top Cover Assembly.2. Use t he n umber ed gr een did loca ted a t t he left side t owa rd t he fr on t of t he pr in ter (seeF igu re 4-17) t o a dju st den si~. l is t he da rkest set tin g, 9 is t h e t igh t es t. An in it ia l s et t in gof W is recommended.

3. F idy close t he pr in ter s Top Cover Assembly.Note When using h-t ier paper and envelopes, t he pr in t densi~ did may need to be set

B t o a lower (da rk er ) s et t in g b m in im ize ba ck gound.

F igu re 4-17. Adjusting Print DensityThe Resolu tion Enh an cemen t fea tu re of t he HP 33449 and t he den si~ a dju stmen ta ffeet ea ch oth er . See Chapt er 3, Sect ion 3-4, for p roper adju stmen t p rocedur es .

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5

5. mNcTIoNfi OWRWEW5-1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2. IMAGE FOWTION SYSTEM. . . . . . . . . . . . . . . . . . . . .Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Photosensit ive Drum . . . . . . . . . . . . . . . . . . . . . . . . . . .Drum Sensit ivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CLEANING: Stage One...... . . . . . . . . . . . . . . . . . . . .CONDITIONING: Stage Two.... . . . . . . . . . . . . . . . . . . .~ITING: St ige Three . . . . . . . . . . . . . . . . . . . . . . . . . .DEVELOPING: Stage Four .... . . . . . . . . . . . . . . . . . . . .TRANSFER Stage Five . . . . . . . . . . . . . . . . . . . . . . . . . .FUSING: Stage Sk . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-3. PAPER PIcKuP/FEEDsYsTEM . . . . . . . . . . . . . . . . . . . .Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Manual Feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Paper J am Sensing, . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Dr ive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-4. MACHINE CONTROL SYSTEM. . . . . . . . . . . . . . . . . . . . .5-5. INTERFACE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . .Genera l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Descr ipt ions of Blocks in the HP334401nter face PCA Diagram . . . . . . . .CPU(Centrd Processing Unit ).. . . . . . . . . . . . . . . . . . . . .ROM(Read-Only Memory) . . . . . . . . . . . . . . . . . . . . . . .NVRAM (Non-Vola t ile Wndom Access Memory) . . . . . . . . . . . . . .SRAM(St it ic Random Access Memory) . . . . . . . . . . . . . . . . . .Address Con troller . . . . . . . . . . . . . . . . . . . . . . . . . . .DRAM (Dynamic Wndom Access Memory) . . . . . . . . . . . . . , . .Bit Shifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Timing Cont roller . . . . . . . . . . . . . . . . . . . . . . . . . . .I/O Con troller . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Video In ter face . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Font Car t r idge In ter face . . . . . . . . . . . . . . . . . . . . . . . . .

5-35-45-45-55-55-65-75-85-1o5-115-125-135-135-145-145-155-165-175-175-175-175-175-175-175-185-185-185-185-195-195-19

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Descr ipt ions of Blocks in the W 33449 Format ter PCA Diagram . . . . . . .Genera l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ASIC (Applimt ion Specific Integra ted Chip) . . . . . . . . . . . . . . . .CPU(Centrd Processing Unit ). . . . . . . . . . . . . . . . . . . . . .EPROM/ROM (Erasable ProgramabIe Read Only Memory/Read Only Memory)NVRAM(Non-Vola t iIe RAM)..,. . . . . . . . . . . . . . . . . . .DW (Dynamic Random Access Memory) . . . . . . . . . . . . . . . .Font Car t r idge Inter face . . . . . . . . . . . . . . . . . . . . . . . . .

5-6. PO~RDISTRIBUTION . . . . . . . . . . . . . . . . . . . . . . . .

5-195-195-205-205-205-205-205-205-21

5-1. Dia gr am of F un ct ion al Blocks for ~ 33440 a nd W 33449 P rin ter s5-2. Dia gr am of EP-S Ca rt ridge Mu st ra tin g Im age Forma tion Syst em .5-3. Photosensit ive Drum . . . . . . .5-4. Drum Cleaning St it ion . . . . . .5-5. Erase hpEffet i . . . . . . . .5-6. Pr imary Corona Assembly . . . . .5-7. Rot a t ing Smnner Mir r or (Top view)5-8. Drum Signals . . . . . . . . . .5-9. Developing an Image . . . . . . .5-10. Transfer of Toner Image . . . . . .5-11. Paper Separa t ion . . . . . . . . .5-12. Fusing P rowss . . . . . . . . . .5-13. Paper P ickup/Feed System . . . .

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. . .5-14. P aper Rea ching t he &gia t ra tion Rollers . .5-15. Main Drive Syatem . . . . . . . . . . . ,5-16. DC Controller Block Diagram . . . . . . .5-17. ~ 33440 In ter face PCA Block Diagram . .5-18. ~ 33449 Format ter Block Diagram . . . .5-19. DC Power Dist r ibu t ion . . . . . . . . . .

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5-35-45-55-65-65-75-95-95-1o5-115-115-125-135-145-155-165-185-195-21

5-1. Drum Sensit ivity Tab Set t ings . . . . . . . . . . . . . . . . . . . . . . . 5-5

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5f.INTRODUCTIONTh is fn nct ion d over view of t he HP 33440 and HP 33449 pr in t er s is des ign ed t o pr ovide t he s er vicer ep resen t a tive wit h a gener a l under st and ing of t h e p roces ses wh ich occu r du r ing p rin t ing. Thediagr am below (F i~ re 5-1) gr oups t h e fou r ba sic funct iona l block s d is cu ssed in t h is ch apt e~s Sect ion 5-2: Image Format ion Sys tem.H Sect ion 5-3: Paper P ickup/Feed Sys t em .s Sect ion 5-4: Mach ine Con t rol Sys tem (DC Con t rolle r PCA).s Sect ion 5-5 : In ter face System.s Sect ion 5-6 : Power Dist r ibu t ion .For add it iond det a ils abou t how the p rin t er s funct ion in va r iou s oper a t ion a l s it u a tion s, r efer a lsoto Chapter 7, Troubleshooting.

To external device (host computer, etc)

t j~ ____ __I SYSTEM INTERFACE 1

I Interface PCB1;

1l 1 , I

Wdeo controller PCS 1!IllL_____ ___q_____jL 1Face up trav~/ - 1 ~_ _L_ _[~ DeliverV

PICK-UP/FEED CONTROL SYSTEM 1SYSTEM ;/

:t~ 4

/ rollers 1- 11/ h DC controller PCB1/ Face down trav II~

____;~LJ __ _ J1/ ~/ A

I

~ __ ij_ _ IMAGE FORMATION 1/ SYSTEM I

!! Mirror ~--------- - Smnning mirror I

t I 1 ITransferandseparationunit

I-J 1u d ~~ u) Cassette I

~ Fixing assemblv I J

Figure 5-1. Diagr am of Funct iona l Block s for HP 33440 and HP 33449 Printers

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5=2sIMAGEFORMATIONSYSTEMOverviewbser pr in t ing r equ ir es t h e in t er a ct ion of sever a l d iffer en t a r ea s of t echnolo~ (mechanid ,e lect ron ics , op t ics , e lect rophotographics , e tc.) which mus t be coord ina ted to p roduce a p r in tedpage. The fir st in t h e sequence of p roces ses , image format ion , cen t er s a r ound th e photosen sit ived rum con ta ined in the Elect rophotograph ic (EP-S) Car t r idge and cons is t i of fou r p rogressivestagess Cleaning.w Conditioning.I Wr it in g.s Developing.MO add it iond s t ages , p er formed ou t sid e t h e EP-S Ca r t ridge, a r e:s Transferring.m Fusing.Mos t image format ion sys t em componen t wh ich undergo wea r or d egr ada t ion (con sumablecomponen t s ) a r e convenien t ly assembled in the rep laceab le EP-S Car t r idge . Because th is makesmain t en an ce es sen t ia lly a n oper at or s t a sk , it ehmin at es t he n eed for a s er vice dl wh en t hes epa~ mu st be r epla ced. Th e EP -S Ca rt r idge con ta in s t he phot os en sit ive dr um , P r ima ry Cor on a,d evelop ing s ta t ion , t on er cavit y, and cl~ning s t at ion . A cros s-s ect ion of t h e EP-S Ca r t ridgedet in g t h e image format ion sys tem and it s r ela t ion sh ip t o ot h er pr in t er compon en t s is illu st r at edin F igu r e 5-2.

CONDITIONING Miro WR!T!NGPrimary Corona Wre 1 Laaer Beam

1 :

Primary tirona GrUEraae Lamps

\,.,r--l.-l

.-. / \.- . .CLEANING ~ Blade

k~

DEVELOPING :q J

1, ;;:;, Developing Cylinder ,,/tPhoto-Fusing Roller Cleaner Sensitive

\ 7,, / CartridgaDrum

b. ~ -b

FUSINGUpper Fusing Roller ~.._ ..-K+~-upRoer

IuRegistration Rollers

f \ TRANSFERRINGStatic:Charge Tranafar CoronaEliminatorLower Fusing Roller FeedGuideAssembly

Figure 5-2. Diagram of EP-S Cartridge Illustrating Image Format ion System

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HP 33440/HP 33449 COMBINED SERVICE MANUALPhotosensitive DrumThe photosen sit ive d rum-th e cor e of t h e image format ion sys tem-ha s specia l p ropet iies wh icha llow an im age t o be formed on it s su rfa ce a nd t hen t ra nsfer red t o pa per . Th e dr um is a nefiruded a luminum cylinder wh ich i s coa ted with a non-toxic laye r of organ ic photoconduct ivema ter ia l (OPC). Th e a lumin um ba se of t he dr um is elect r id ly connect ed t o gr ou nd.Th e OPC ma ter ia l h as pr opet iies s im ila r t o a phot odiode. It becomes elect r idly condu ct ive (inone d ir ect ion on ly) when exposed to ligh t . Nega t ive cha rges depos it ed on th e sur fa ce of t h e d rumcon du ct t o t he a lumin um (zer o pot en tia l) ba se of t he dr um wh en exposed t o ligh t. Ar ea s of t hed rum not exposed to figh t r ema in nonconduct ive and r et a in t h e in it ia l ch a rge.cau t i on Do n ot expose t he dr um t o dir ect su nligh t or a ny ot her br igh t t igh t sou rce;

[~upermanen t damage t o t h e dr um cou ld occu r.

Drum SensitivityBecaus e dl dr ums cannot be manufa ct ur ed t o t he exa ct s ame s en sit ivit y levels , t hey a r e t es ted a tt h e fa ct or y a nd given a r a tin g of h igh , medium , or low sen sit ivi~ (s ee Table 5-l). Dependin g ont his r at in g, t ibs a re pla ced on t he m rt ridge wh ich en able pr in ter m icr o~t ch es wh ich , in t ur n,con tr ol bs er power ou tpu t t o a dju st for t he dr um s s en sit ivi~ level. Th es e m icr oswit ch es dsoin dica t e wh et her or n ot t he EP -S Ca rt r idge is in st iled.

Table 5-1. Drum Sensitivity Tab Settings-. D= Sensit ivity. Csms 1 CSENS 2High L LMedium L HLow H LCar t r idge not Inst iled H HIL = Switch Activated I

High-VoltagePower Supply

Figure 5-3. Photosensitive Drum

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HP 33440/HP 33449 COMBINED SERVICE MANUALCLEANING: Stage OneDu rin g t he fir st st age of t he im age forma tion pr ocess, t he dr um s su fice is pr epa red t o h old a nim age t hr ou gh a ph ysid a nd elect rid clea nin g pr ocess. Du rin g pr in tin g, t he dr um is con st an tlyr ot at in g, m t in g s ever a l complet e r ot it ion s per pr in t ed page. Befor e formin g t he image for a givens ect ion of pr in t , lefiover t on er fr om t he pr eviou s r ot a tion of t he dr um mus t be r emoved. Th is isa ccomplis hed by a r ubber clea nin g bla de wh ich scr a pes t on er off t he dr um and in t o a debr is ca vit y.A sweeper bla de in t he debr is ca vi~ r ot at es, weepin g t oner away fr om t he a rea n ea r t he dr um(see Figure 5-4).Th e dr um is elect rost at idly clea ned by t he E ra se bmus (see F igu re 5-5). Th ese five small lamps,lom ted in t h e h inged Top Cover Assembly, Mumina t e t h e d rums photosen sit ive ma t er ia l t on eu tdlze a ny elect rid ch ar ges wh ich may h ave pr eviou sly been on t he dr um . Th e illumin at ionof t h ese lamps is con t r olled by th e Mach in e Con t r ol Sys t em (DC Con t r o~er PCA).

Cleaning bladeI

Sweeping

Sweeper strip

Figure 5-4. Drum Cleaning Station

-/y$Lamps Red . . . .. . 1Filter

::..... 1&~,.. Photosensitive,.. Layer:....!:. Aluminum.... BaseFigure 5-5. Erase Lamp Effect

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HP 33440/HP 33449 COMBINED SERVICE MANUALCONDITIONING: Stage TwoMer t he dr um h as been physidly a nd elect ridly clea ned, it m ust be con dit ion ed. Th econdit ion ing p roces s con s is t s of t h e app liwt ion of a un iform nega t ive cha rge on th e sur fa ce of t h edr um by t h e P r ima ry Cor on a As sembly (see F igu re 5-6) loca t ed in side t he EP -S Ca rt r idge. Th is 6 W ch ar ge, a pplied t o t he cor on a wir e by t he H igh Volt age P ower Su pply Assembly, cr ea tes acor on a eflect . Th is m ea ns t ha t t he a ir su rr ou ndin g t he wir e is ion ized a nd n o lon ger a ct s a s a nin su la t or . Nega tive ch ar ges fr om t h e wir e m igr a te t o t he su rfa ce of t he dr um .Th e P r imar y Cor on a gr id (see F igu re 5-6), pos it ion ed between t he cor on a wir e a nd t he dr um ,r eWla t es t he volt ige a pplied t o t he dr um s su rfa ce, s o t ha t a u niform 600 V ch ar ge is depos it ed.Th e cor on a gr id is con nect ed t o a va r is tor in t he H igh Volt a ge Power Supply As sembly wh ichbleeds off a ny e~r a cu rr en t wh ich wou ld r a is e t h e su rfa ce volt age a bove t h e des ir ed level.

PrimaryCorona

PrimaryGrid

Figure 5-6. Primary Corona Assembly

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HP 33440/HP 33449 COMBINED SERVICE MANUALWRITING: Stage ThreeAft er r ot at in g pa st t he con dit ion in g st at ion , t he dr um h as a u niform 600 V pot en tia l on it ss ur fa ce. At t h e wr it in g s ta t ion , a la ser beam is u sed t o dis ch ar ge t h is pot en t ia l in s elect ed a r ea s byfocu sing la ser figh t on select ed por t ion s of t h e photoconduct ive d rum . Th is cr ea t es wha t is knowna s a n elect r o~t ic image. Th is image is la t er developed in to a visible image,The following is an exp lanat ion of how la ser ligh t is con t r olled t o acMeve th e elect r os t at ic imagedescr ibed a bove. La ser ligh t is pr odu ced by a sm~ la ser diode wh ich is t ur ned on a nd off bysupplin g or den yin g power . Th e fixed focu s beam of t he la ser diode is dir ect ed on to a s ix-fa cedr ot a tin g polygon m ir r or (s ee F igu re 5-7). As t he m ir r or r ot a tes , t he beam r eflect ed off t he m ir r orsweeps in a n a rcin g fa sh ion . Th rou gh a set of m ir ror s a nd len ses, t he swept beam is br ou gh tin to focu s t o descr ibe a h or izon ti lin e on t he ph ot osen sit ive dr um . Th e beam r ea ch es t he dr umt hr ou gh a n open in g in t he t op of t he EP-S Ca rt ridge.Beca use t he beam is sweepin g? t h e en tir e len@h of t he dr um ca n be cover ed by t he beam;s im ila r ly, becau se t h e d rum is r ot a t ing, t h e en t ir e cir cumfer ence can be cover ed . Th is sweep ingof t he dr um a nd modu la tion of t he beam a llows exposu re of dl desir ed su rfa ces on t he dr um (seeF igu re 5-8). Th is is sim ila r t o h ow t he elect ron beam in a t elevision set sca ns t o form a videoimage on t h e scr een .Th e speed of t he Sca nn er Mot or (wh ich r ot at es t he polygon al m ir ror ) a nd t he speed of t he mainmot or (wh ich r ot it es t he dr um ) a re syn ch ron ized so t h at ea ch succes sive sweep of t he beam isoffset on the sur face of the drum by 1/300 of an inch. The beam can a so be turned on and offa t su ch a r at e a s t o pla ce a n in termit ten t ser ies of dot s of ligh t every 1/300 of an in ch in t hehor izon t i d ir ect ion . Th ls is how the p rin t er a ch ieves it s 300 x 300-dot i-p er -squa re-in ch r esolu t ion .(Not e t h a t one a spect of t h e HP 33449s Resolu t ion Enhancemen tTM fea tur e Wows for mor edefin ed dot pla cemen t in t he h or izon ti dir ect ion .) Th e Scann er Mot or is con t rolled by t h eSCNCONT lin e fr om the DC Con t r oller . Th is volt age level va r ies d epending on th e Scanner Motors peed feedba ck s ign a ls FG+ and FG (see F igu re 5-15 a ls o).Befor e t h e beam r ea ch es t he dr um a t t h e begin nin g of ea ch sweep, it is r eflect ed off a smd mir rorin to an opt id fiber cable. Th is m oment i~ pulse of figh t is sen t down the opt id fiber t o the DCCon tr oller PCA wher e it is con ver ted t o a n elect r id sign a l wh ich , in t ur n, is u sed t o s yn ch ron izet he ou tpu t of da ta for on e sweep (sm n lin e). Th is pu lse ~led t he Beam Det ect pu lse is dsou sed t o dia gn ose pr oblems wit h t h e la ser or s ca nn er mot or . (See F igu re 5-8.)Aft er p as sing th e wr it ing s t it ion , t h e d rums sur fa ce ha s an invis ible elect r os t at ic la t en t image.The por tion s of t he d~m n ot exposed t o t he la ser a re st ill a t t he 600 V pot en tia l (pla cedt h er e by t he P r ima ry Cor on a) wh ile t h ose p or t ion s expos ed t o ligh t h ave been disch a rged t oapproxima tely 100 V.Note Beca use t he HP 33440 a nd ~ 33449 pr in ter s a re cla ss I la ser pr odu ct s, t hey a re,8 sa fe for office or da ti pr ocessin g u se. Th e la ser u sed in t he pfin ter is a solid st at e,

&b in fr a r ed , cla ss In la ser .

warning Although the infrared laser beam is invisible, eye damage may result if director indirect (reflected) eye contact with the laser beam should occur. Heed allCAUTIONS and WARNINGS when woking on the printer with covers removed orwith the laser unit itself.

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Direction of scan

\

4/---- - /,/ .4, //\ /&// Laser beam/K Scanning mirror

a

To external device

r 8 1Interface PCA=D VDO VSTNC

t + \DC controllerBD1 PO LDRV SCNCONT I

fiberk

-1OOV CHARGEWHERE LASERSTRIKES-600V CHARGEWHERE LASERDOES NOT STRIKE


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HP 33440/HP 33449 COMBINED SERVICE MANUALDEVELOPING: Stage FourAt the develop ing s t it ion , the invis ib le e lect ros ta t ic image is deve loped in to a vis ible image ont he dr um when t on er fr om a developer cylin der is t r an sfer r ed t o disch a rged a r ea s on t h e dr um .Th e developer con sist s of a r ot at in g met ilic cyfin der , a fr eed magn et t ha t r un s t he len ~h of t hecylinder , a t oner mvit y, and a toner -br u sh -h eigh t -con t rol blade. The toner in t h e t oner cavit yis a powde~ su bst in ce made of bla ck pla st ic r esin bou nd t o ir on pa rt icles. Th e ir on in t het on er muses it t o be a tir act ed t o t he magn et in side t he cylin der . As t he cylin der r ot at es, t hebmsh -heigh t -con t r ol blade hmit s t h e amoun t of t oner on th e cyt inder .The p la s tic t oner p ar t icles a cqu ir e a nega t ive sur fa ce cha rge by rubbing aga in st t h e cylinderwh ich is connect ed to a nega t ive DC supply (s ee F igu r e 5-9). Th is e lect r os t at ic cha rge cau ses t h et on er pa rt icles t o be a tt ra ct ed t o t he a rea s of t he dr um wh ich h ave been exposed t o la ser ligh ta nd r epe~ed fr om t he a rea s n ot exposed (see F igu re 5-9). An AC pot en tia l is dso a pplied t o t hedeveloper cyt in der t o fa rt her a ss is t t on er pa t iicles t o over come t he a t tr a ct ion of t he magn et a nd t opull t on er back to t h e cylinder fr om unexposed a r ea s, t hus improving den si@ and con t r as t .Th e DC bia s of t h e developer cylin der wn be u ser -a dju st ed wit h t he P r in t Den si@ con t rol. Th isch an ges t he a t tr a ct ive for ce between t on er a nd dr um , pu llin g mor e or les s t on er t o t he dr um .

+V

o.100-600

-v

Developing cylinder surface potent ial* Drum surface potential/ (ex posed area)----- -------------- ---. . . .- _ DC bias-------- --------- - \::::~faceTime (t) _ (unexpo=d area) , BladeK]C......... .......::...........:,....E :. -... \2u :.. .: ..Y :+. % n.- I!---.--: .:. 0g}:..+: ,.n .:.. .~~ ~ ~

+::::: }Develop ing cy linder

9AC biasIA (1600 Vp-P)#lDCbas

Figure 5-9. Developing an imageNote Th e ch ar ges makin g u p t he la ten t im age sh own in F igu re 5-9 a re n ega tive bu tqi

t hey a re s hown a s pos it ive in t he illu st r at ion beca use t hey a re les s n ega t ive t ha nw t he ch ar ges on t he t on er .

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( HP 33440/HP 33449 COMBINED SERVICE MANUALTRANSFER: Stage FiveAt t he t ra nsfer st at ion , t he t in er im age on t he dr um is t ra nsfer red t o t he pa per . A cor onaa ssembly is posit ion ed beh in d t he pa per so t ha t t he pa per , wh ich is t ra velin g a t t he same speed t hed rums sur fa ce is r ot a t ing, con t a ti t h e d rum . Th is cor ona p roduces pos it ive cha rges wh ich collecton t he ba ck of t he pa per . Beca use t he posit ive ch ar ges on t he pa per a re st ron ger , t hey pu ll t henega t ively cha rged toner pa r t icle s off the d rum (see Figu re 5-10).As t he pa per a nd dr um con tinu e t o a dva nce, t he sm all r adiu s of t he dr um an d t he st iffn ess of t hepa per ca use t he pa per t o n at ut ily peel awa y fr om t he dr um (see F igu re 5-11). Sepa ra tion is dsoa ssist ed by a high n ega tive vol~e being a ppt ied t o a r ow of sh ar p m et i t eet h-t he St it ic Cha rgeElimina tor . Th is S ta t ic Charge Elimina tor weakens the a t t r act ive forces between the nega t ivelycha rged d rum sur fa ce and pos it ively cha rged paper . Withou t t h is a ss is t an ce, t h in paper s cou ldcon ceiva bly wr ap a rou nd t he dr um . F r om the t ra n sfer s ta t ion , t he paper moves t o t h e fu sin gst at ion a nd t he dr um r ot at es ba ck t o t he clea nin g st at ion t o pr epa re it t o r eceive t he n efi sect ionof pr in t .

Figure 5-10. Transfer of Toner Image

Figure 5-11. Paper Separation5-11


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HP 33440/HP 33449 COMBINED SERVICE MANUALFUSING: Stage SixUnt fl t he pa per r ea ch es t he fu sin g st at ion , t he t on er is h eld on t he pa per ody by gr avi@ andweak elect r os ta t ic for ces . At t he fu sin g st a tion , t on er is ma lt ed a nd for ced in t o t he paper by h ea ta nd pr es su r e t o pr odu ce a permanen t image. Th e fu sin g s ta t ion (see F igu re 5-12) con sisk of a nu pper n on -st ick r o~er t ha t is h at ed fr om t he in side by a high in ten sit y qua rt z lamp a nd a lowersofi r o~er t ha t Wows pr essu re t o be a ppt ied over a la rge con ta ct a rea between t he pa per a nd t heu pper fu sin g r o~er . At t his poin t t he t on er is m elt ed a nd squ eezed in to t he pa per fiber s. Tok eep t he t on er or pa per fr om s tick in g t o t h e Fusin g RoUer , t h e r oller is cover ed wit h a n on -s tick ,Teflon -@e r esin . A clea nin g pa d, wh ich is in con ta ct wit h t he F usin g Ro~er , a ppt ies a t hin coa t ofsificon e ofl b t he su rfa ce of t he r oller t o dso h elp pr even t st ick in g. Th e clea ner pa d dso ser ves t owipe off a ny t on er or debr is t ha t is t ra nsfer red t o t he r oller .Th e Fus in g RoUer t emper at u re is mon it or ed by t he Mach in e Con tr ol Sys tem via a t h erm is tor . Th eMa ch in e Con tr ol Syst em main tin s a t emper at ur e of 165 C (330 F ) du rin g st an dby mode a nd180 C (355 F ) du rin g pr in tin g.A t hermopr ot ect or swit ih is ds o loca t ed in t he Fus in g As sembly, a dja cen t t o t h e t h ermis tor . Th et hermopr ot ect or sh ut i down (open s t he power cir cu it b t he fu ser bu lb) wh en t he t emper at ur e isin ~cess of 210 C (410 F ). If t he fisin g syst em is sh ut down by over hea tin g, a n ERROR50 isdis pla yed. E t h is occu rs, t he pr in t er mu~ be power ed off a nd t he t h ermopr ot ect or r epla ced. Th epr in t er mum r ema in power ed off for a t lea st seven t o t en m in ut es or t he ERROR50 condit ion willremain.

Fused Toner\ ,Fusing roller cleaning pad

\

area

Pressure roller

Figure 5-12= Fusing Process

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Paper PathThe paper pick up and feed sys tem is r es pon sible for pick in g paper fr om t he in pu t pa per t r ay,deliver in g it t o t he image forma t ion sys tem a t pr ecis ely t h e r igh t t ime, feedin g it t o t he fu sin gst at ion , a nd deliver in g it t o t he ou tpu t t ra y. F igu re 5-13 illu st ra tes t he ~ 33440~ 33449 pa perpa t h. Th e -s et t e-feed paper pa th begin s wh en t he Mach in e Con t rol Sys@m (DC Con t rollerPCA), &er r eceivin g a pr in t command, s ta r ts t he Ma in Dr ive Mot or . Appr oximat ely NO secondsla ter , t he P aper P icku p Solen oid is en abled md t he P aper P ick up Ro~er mak es on e r ot at ion a ndfeeds paper t o t he ReQs tr a tion RoUer s. S in ce t h e Regis tr at ion Roller s a r e n ot t ur nin g a t t h is t ime,t he fr on t edge of t he paper bows (s ee F igu re 5-14).

vMl Main motor I PaWr control PCA III1 SL301 roller

Feed Gui;e AssemblyPS331(Pwr deliveq sen@r)P,ck.p ,oller

PS301 : Paper sensorPS302: Manual paper feed sensor

Figure 5-f13. Paper Pickup/Feed system

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HP 33440/HP 33449 COMBINED SERVICE MANUALThe r egis tr at ion r oller s a lign t he lea din g edge of t he paper wit h t he lea dln g edge of t he imageon t he phot os en sit ive dr um . When t h e dlgnmen t is cor r ect t he Regis tr a tion Clu t ch Solen oid isa ct iva t ed a nd t he r oller s t ur n a nd advance t he paper t owa rd t h e phot os en sit ive dr um . Aft er t hepr in t im age h as been t ra nsfer red t o t he pa per a t t he t ra nsfer st at ion , t he pa per is fed in to t heFu sing Assembly by th e Regis tr a t ion and Feed Roller s .

Registration Rollers Paper (Bowed) Pick-up Roller

TransferCorona o\ ~o o0UT-

oq

Separation Pad PAPER TRAY

Figure 5-14. Paper Reaching the Registration RollersManual FeedTh e t im in g of m anu al pa per feed is iden ti~ t o t he t im in g for ~set te pa per feed, except for t hefollowing points:1,

2.

A differ en t in pu t pa per s en sor is u sed.s Ca ss et t e pa per ou t s en so~ PS301.s Manua l feed paper s en sofi PS302.Th e in it ia l wa rmup t im e for m an ua l feed is lon ger . It is a ssumed t ha t m an ua l feed will beu sed for h ea vier media su ch a s en velopes a nd h eavier pa per . Bemuse t h ese h ea vier pa per s willa bsor b mor e h ea t, t he ext ra wa rmup t im e a llows dl compon en ts of t he fu sin g syst em t o r ea cht he 180 C (355 F ) t emper a tu re befor e paper movemen t begin s, wh ich is r equ ir ed for pr operfu sin g of t on er t o t hes e paper s.

Paper Jam SensingThe Paper Deliver y Sen sor (PS331) indim tes when paper r ea ches and clea r s t h e fu sing s t at ion .PS331 det ect s a pa per jam in any of t he fo~owin g condit ion s:s Paper does n ot r ~ch t he deliver y s en sor wit h in t h e r equ ir ed t ime (deliver y dela y jam).s Paper does n ot cl-r t he deliver y s en sor wit h in t h e r equ ir ed t ime (deliver y jam).s P aper is pr esen t a t t he deliver y sen sor wh en power is swit ch ed ON (pa per wa s left in side t hepr in t er a nd t he fu ser cooled-ofi, if t he fu ser is h ot it will eject t he paper ).

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HP 33440/HP 33449 COMBINED SERVICE MANUALMain DriveTh e Mt in Mot or (Ml) a nd Sca nn er Mot ir (M3) pr ovide t he mech an id dr ives n ecessa ry forpr in tin g. Th e Ma in Mot or is con t rolled via a dr iver by commands ou tpu t fr om t he DC Con t roller .The Ma in Motor , via gea r t r a in s, d rives t h e follot ings P ick up Roller .s Registrat ion Assembly.s Drum (t it hln EP -S Ca rt ridge).s Feed Rollers.s Fusing Assembly.N Detivery Rollers.

n L I I

indicalcs mecl]anical linkage

indicates enable lines

1A

IllI II SCANNER DRIVE ,Ommand (SCNCONT) J III JFG +Scann,g mfrror FG-

Figure 5-15. Main Drive System

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5H4.MACHINECONTROL SYSTEMThe DC Con t ro~er PCA-th e mach in e con t r ol sys t em-is r espon sible for coordin a t ing d l a ct ivit iesinvolved in t h e p rin t ing p roces s. I t d rives t h e la s er beam , coordin a ting dot p at ier n (video)da ta fr om t he In t er fa ce/Format ier PCA t it h paper s ize, dr um sen sit ivit y, a nd la ser beammot ion in forma tion . The mach in e con t r ol sys t em dso con t r ols and mon it or s p aper mot ion , t h eh igh -volt age s ys tem , fu ser t emper at u re, er as e lamps , a nd W motor s. It d so sh a res mach in e s ta t usin format ion t it h t h e I nt er fa ce/Format t er PCA so th a t p roper d iagnos t ic mes sages a r e d isplayedon t he Con t rol P anel (s ee F igu re 5-16). A fis t of t he s ign als mon it or ed or con tr o~ed by t he DCCon t r oller PCA is in Chap&r 7, Sect ion 7-7.In summa ry, t he follot in g it ems a re con t rolled by t he mach in e con t rol s ys tem :

s Paper mot ion . s Paper s ize and ava ilabilim .s Laser dfive. s High-voltage system.s Erase Lamps. s Fuser t empera tu re.s Timing. s Smnn er an d M~n Mot or dr ive.s Machine s~tus . s +24 V oper a tion .

mm

nDccontrollerPCA

FomatterlInterfacePCAExternal

d-ice

I II I -

1 Ac we ,Powr switih doleFigure 5-%6. DC controller Block Diagram

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5-5. BNTERFACEsYsTEb4GeneralFor bot h t he HP 33440 (In ter fa ce PCX) a nd HP 33449 (F orma tt er PC#), t heIn ter face/Format ter PCA is responsib le for the followingCommunica tin g wit h t he h os t s ys tem , eit h er t hr ou gh t he s ta nda rd s er ia l or pa r allel por t s ort h rough th e op tiona l 1/0 in t er fa ce, if in st iled .Mon itor ing opera tor in ter face via the p r in ter s Con t rol Panel and d isplaying p r in ter s t a tu sin format ion to the opera tor .Communica t ing with the p r in t engine (DC Con t rolle r PCA).Storing font information.Storing configuration information.Man ipula t ing in coming da t a , such a s conver sion of ASCH cha ract er d at i in t o a bin a ry pageimage t h at t he pr in t en gin e may u se for cr ea t in g a la ser image on t he phot ocondu ct ive dr um .

In add it ion , for t h e HP 33449 on ly, t h e Forma t ier PCA con t a in s cir cu it r y for Resolu t ionEnhancementTM capab le of modu la t ing the DC Con t rolle r PCAS laser d rive cir cu it ry to p roducesmoothe& black-to-white boundar ies.Opt ion al m rt ridges may dso be in s~ed in con nect or s on t he In ter fa ce/F orma tt er PCA t oprovid e add it iond fon t s for t ext p rin t ing or t o over lay por t ion s of mach in e code (ROM) for p rin t eremu la t ion . P r oper communica t ion bet ieen th e I nt er fa ce/Format t er PCA and th e hos t sys t emis es ta blish ed by con f~r at ion s et t in gs s elect ed a t t h e Con tr ol P anel. ASCII code and gr a ph icsd at a fr om the ext er n al d evice is t h en p roces sed according to t h e Con t r ol Panel s et t in gs or p rin t ercommands a nd is con ver ted t o dot da ta . Th e dot da ta is u sed for modu la tin g t he la ser .

Descriptions of Blocks in the HP 33440 Interface PCA DiagramThe HP 33440 In ter fa ce PCA Block Dia gr am is sh own in F igu re 5-17,CPU (Central Processing Unit)The CPU block con t a in s a 16-bit m icr op roces sor t h a t execu t es p rogr ams s tor ed in ROM to con t r olt h e oper a t ion of t h e I nt er fa ce PCA.

ROM (Read-Only Memory)Bes id es s t or ing micr op roces sor con t r ol p rogr ams , t h e ROM stor es t h e dot p at ier n s of in t er n alch a ra ct er s et s . Maximum ROM capacit y is 1 Mbyt e.NVRAM (Non-Volatile Random Access Memory)The ~ is a non-vola t ile random-access memory with a capacity of 32 bfies.con t en ts a r e n ot los t wh en power is swit ch ed off, it is u sed t o s tor e pr in t in g s et upin forma tion en t er ed via t h e Con t r ol Panel and page coun t in forma tion .SRAM (Static Random Access Memory)

Since i t sconfiguration

The 4 ~yt e SRAM is used as a st ick area in the 16 Mbyt e addr ess spa ce accessed by themicroprocessor (CPU).

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I Jfi. I POnrOrH riainfia I lTmMOwOll lfi~Mb~m)l

IL-. dcontrolP.mlFigure 5-17. HP 33440 interface PCA Block Diagram

~ddress ControllerThe addr es s con t ro~er is implemen t ed a s a s in gle ga t e a rr ay cir cu it (GA1). J umper s a t ta ch ed t othe gat e ar ray enable the ROM a ddress region t o be changed. The ROM has a mt im um mpa ci~of 1 Mbyt e a nd is u sed in fou r sepa ra te sedion s. Th e a ddr ess con tr oller dso ou tpu ts a ddr essin forma tion en abfin g amess h da ta in t he Int er fa ce PCAS DRAM (bmum mpa ci@ of 512~ytes) and e~ansion DW (mAmum mpacity of 4 Mbytes).DRAM (Dynamic Random Access Memory)The DRAM is a dynamic random access memory with a @mum mpaci@ of 512 ~@s. Its tor es pr in tin g a nd fon t in forma tion in pu t fr om t he efier nd device. It d so s tor es pa ge format t in gin format ion and other pa rameter s r equ ir ed by the in terna l microp rocessor . The microp rocessorsubdivides the DRAM memor y space a s required. An e~ansion memory board a be added t oin cr ea se t he DRAM by 1, 2, or 4 Mb~es, depen din g u pon t he boa rd pu rch ased.Bi t ShifterTh e bit sh ift er is u sed t o offset or over la y pr in ted ch ar act er s, a nd t o sh ifi da ta by 1 t o 15 bit s.fiming ControllerThe t im ing con t r oller gener a t es t im ing s igna ls n eeded when da t a is wr it t en t o or r ead fr omDW. It dso genera t es DRAM refresh signals.

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HP 33440/HP 33449 COMBINED SERVICE MANUAL1/0 ControllerTh e 1/0 con tr oller con tr ols t he t im in g of da ta in pu t fr om on opt ion al 1/0 PCA t o t hemicrop rocessor via the pa ralle l in ter face connector . I t d so con t rols the t iming of communica t ionwit h t he DC Con tr oUer .

Video InterfaceTh e video in ter fa ce h as t io 4-~~e sca n buffer m emor ies (SWS) through which pr in t ingin format ion conver t ed to dot d at i is ou tpu t con t inuou sly t o t h e DC Con t r oller .Font Cartridge InterfaceFon t mr t ridges a r e ROM ca r t ridges wh ich hold add it iond dot p at t er n dat a for differ en t fon t s.The fon t ca r t ridge in t er fa ce bu ffer s t h e ma in bu s fr om the fon t ca r t ridge connector s.

Descriptions of Blocks in the HP 33449 Formatter PCA DiagramGeneralTh e Block Dia gr am of t he HP 33449 Forma tier PCA is sh own in F igu re 5-18. An expla na tion ofthe b locks with in the d iagram follows:

mmOptional ~Dptiona[

68000 Standard Cartridge

L HE,

Cartridge10MHz EPRBM nCPU HR RDM J6

Serla(1/0 (Right) (Left)J2

I System Bus 11 II

DptionaLV 1/0 Operator EngineInterfaceExpended Pane( NVRAM J11/0 J9 J8 (to DC Contro((er)

Figure 5-18. HP 33449 Formatter Block Diagram

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HP 33440/HP 33449 COMBINED SERVICE MANUAL5-6. POWER DISTRIBUTIONPower dist ribu tion is illu st ra ted in F i~r e 5-19. Wh en t he ON /OFF swit ch is set t o ON , ACvolt a ge is s upplied t o t he DC Power Supply As sembly via t he AC Power Modu le. Fu se F1 pr ot ect it he DC Power Supply As sembly fr om cu rr en t s ur ges. Th e DC Power Supply pr ovides t h e followin gvoltages:

+5 Vdc and -5 Vdc+ 24A Vdc an d + 24B Vdc

Th e ~SET sign al gen er at ed by t he DC Power Su pply Assembly r esu lt s fr om a ny of t he followin gconditions:s When the power is in it ia lly swit ch ed ON.s When t he +5 Vdc power fa lls below t he r equ ir ed level.s When AC power is momen t a rily in t er r upt ed .Th e +5 Vdc power su pply is t he fir st su pply en abled a nd is t he on ly volt age level r equ ir ed t ot i~e u p t he main m icr opr oces sor on t he DC Con tr oller PCA. Aft er t he p roces sor in it ia lizesit self, t h e p roces sor gen er at es t he ~MOTE sign al wh ich en ables t h e +24 Vdc r egu la t or s.

_ _

F---::w~ DCPOWERmPPLY/MAIN MOTORDRIVER MODULEJ50z FILTERING,RKTIFICATlON a REGULATION3 - . . .. A.....5A ~:;:Ry::K;

+24. ,J- ~.. .1y ~+44 ;iii


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6REMOVAL AND REPLACEMENT

Contents6. R~OV&ANDREPMC_~

6-1.INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . .Genera l . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tools Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hardware Review . . . . . . . . . . . . . . . . . . . . . . . . . . . .ComponentLomtionandIdent ifimt ion . . . . . . , . . . . . . . , . . . .

6-2. COVERS,PANELS,ANDASSOCWTEDPARTS . . . . . . . . . . . . .Genera l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MainBodyCovers : . . . . . . . . . . . . . . . . . . . . . . . . . . .HP33440Pr inter . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP33449Pr inter . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP33449FanGuide(Ser idNumberPla te) . . . . . . . . . . . . . . . .

Control Panel . . . . . . . . . . . . . . . . . . . , . . . . . . . . . .F rontSuppor tP la te . . . . . . . . . . . . . . . . . . . . . . . . . . .Miscellaneous Covers . . . . . . . . . . . . . . . . . . . . . . , , . . .Upper and Lower Face-Up (Rear ) Output Trapdoor s . . . . . . . . . . . . .Cover Release But ton . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-3. WN BODY COMPONENTS.. . . . . . . . . . . . . . . . . . . . .OZONE F ILTER MOUNT . . . . . . . . . . . . . . . . . . . . . . . . .UPPER COOLING FAN . . . . . . . . . . . . . . . . . . . . . . . . .AC PO~RMODULE . . . . . . . . . . . . . . . . . . . . . . . . . .WNMOTOR AND DR~ ASSEMBLIES . . . . . . . . . . . . . . . . .Mtin Motor and Drive Assembly. . . . . . . . . . . . . . . . . . . . .57- and 19-Tooth Gears and Drum Drive Sht i . . . . . . . . . . . . . .Feed Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .

DC PO~R SUPPLY ASSEMBLY.. . . . . . . . . . . . . . . . . . . .DC Power Supply Fuse . . . . . . . . . . . . . . . . . . . . . . . . .DC Power Supply Assembly . . . . . . . . . . . . . . . . . . . . . . .

PWERCONTROL PCA . . . . . . . . . . . . . . . . . . . . . . . . .HIGH-VOLTAGE PO~R SUPPLY ASSEMBLY . . , . . . . . . . . . . .LASER/SCANNING ASSEMBLY.. . . . . . . . . . . . . . . . . . . .F IBER OPTIC CABLE . . . . . . . . . . . . . . . . . . . . . . . . . .COVER LATCH ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . .Genera l, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Right a nd Left Cover La tch H ooks . . . . . . . . . . . . . . . . . . . .Right and Lefi Hook Guides . . . . . . . . . . . . . . . . . . . . . . .

6-56-56-56-66-76-116-116-116-116-126-146-156-166-176-186-186-196-196-206-206-216-216-226-236-246-246-246-256-266-276-276-286-286-286-28

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PAPER PICKUP/INPUT TRAY AREA . . . . . . . . . . . . . . . . . . . 6-29Genera l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29Paper Sensing Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29Laser Shut ier Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30Feed Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31Manual Feed Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32Pressure Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33

REGISTRATION ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . 6-34Genera l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34Regist ra t ion Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 6-34Trant ier Corona Roller Grounding Blo& . . . . . . . . . . . . , . . . . 6-35Separa t ion Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36

TRANSFER CORONA ASSEMBLY. . . . . . . . . . . . . . . . . . . . 6-37TRANSFER AREA RESISTOR REPLACEMENT . . . . . . . . . . . . . . 6-37FEED G~DEASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . 6-38Feed Guide Grounding Spr ing Pla te . . . . . . . . . . . . . . . . . . . 6-39FUSING ASSE~LY .,...... . . . . . . . . . . . . . . . . . . . 6-40Fusing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40Efit Sensor PCA and Thermistor . . . . . . . . . . . . . . . . . . . . . 6-40Thermoprotector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40Ht Sensor Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-42

6-4. TOP COWR ASSEMBLY COMPONENTS . . . . . . . . . . . . . . . . 6-43Genera l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43TOP COVER ASSEMBLY REMOVAL . . . . . . . . . . . . . . . . . . . 6-44Method One . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-44Method No . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-45

M~ORSHUTTER ASSEMBLY.. . . . . . . . . . . . . . . . . . . . 6-46-OR ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47ERASE WASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . 6-48ERASE LAMP CONNECTOR ARM. . . . . . . . . . . . . . . . . . . . 6-49DEL~RYAREA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-49Fuser Insu la t ing Cover . . . . . . . . . . . . . .. . . . . . . . . . . . 6-49Defivery Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50Defivery Coupler Assembly . . . . . . . . . . . . . . . . . . . . . . . 6-50Sta t ic Eliminator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-51Deflector P awls (Claws) . . . . . . . . . . . . . . . . . . . . . . . . . 6-51

TOP COVER ~GE BRACKET PLATES . . . . . . . . . . . . . . . . . 6-526-5. BOTTOM COWR COMPONENTS . . . . . . . . . . . . . . . . . . . 6-53BOTTOM COVER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . 6-53LO~RCOOL~G FAN...... . . . . . . . . . . . . . . . . . . . 6-53~TERFACE/FORMATTER PCA . . . . . . . . . . . . . . . . . . . . . 6-54DC CONTROLLER PCA . . . . . . . . . . . . . . . . . . . . . . . . . 6-55

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6-1.6-2.6-3.6-4.6-5.6-6.6-7.6-8.6-9.6-10.6-11.6-12.6-13.6-14.6-15.6-16.6-17.6-18.6-19.6-20.6-21.6-22.6-23.6-24.6-25.6-26.6-27.6-28.6-29.6-30.6-31.6-32.6-33.6-34.6-35.6-36.6-37.6-38.6-39.6-40.6-41.

Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rea r View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .In ter ior Viewwith Covers Removed . . . . . . . . . . . . . . . . . . . .Bot tom View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .In ter na l P r in t er Compon en ts (HP 33440 shown , bu t dl in ter na l pa r ts a re

essen t ia lly ident id) . . . . . . . . . . . . . . . . . . . . . . . . . .HP33440Main Body Covers Assembly . . . . . . . , . . . . . . . . . . .HP33449Main Body Covers... . . . . . . . . . . . . . . . . . . . . .HP 33449 Front and Top Cover Panel Replacemen t . . . . . . . . . . . . .Fan Guide Remold . . . . . . . . . . . . . . . . . . . . . . . . . . . .Control Panel Remold . . . . . . . . . . . . . . . . . . . . . . . . . .F ront Suppor t Pla te . . . . . . . . . . . . . . . . . . . . . . . . . . .Miscellaneous Covers . . . . . . . . . . . . . . . . . . . . . . . . . . .Face-Up Output Trap doors... . . . . . . . . . . . . . . . . . . . . .Ozone Filt er Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . .AC Power Module and Upper Cooling Fan . . . . . . . . . . . . . . . . .Main Motor and Drive Assembly. . . . . . . . . . . . . . . . . . . . . .57- and 19-Tooth Gears a nd Drum Drive Sht i . . . . . . . . . . . . . . .Feed Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .DC Power Supply Assembly.,.. . . . . . . . . . . . . . . . . . . . .Paper Control PCARemovd . . . . . . . . . . . . . . . . . . . . . . . .High-Voltage Power Supply Assembly . . . . . . . . , . . . . . . . . . .Laser/Scanning Assembly . . . . . . . . . . . . . . . . . . . . . . . . .Cover La tch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .Paper Sensing Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . .Laser Shut ter Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . .Feed Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .Manual Feed Guide and Pressure Assembly . . . . . . . . . . . . . . . . .Main Body Block (Invert ed) . . . . . . . . . . . . . . . . . . . . . . . .Regist ra t ion Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .Transfer Corona Roller Grounding Block . . . . . . . . . . . . . . . . . .Separa t ion Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Transfer Corona Assembly and Resistor Loca t ions . . . . . . . . . . . . . .Feed Guide Assembly, . . . . . . . . . . . . . . . . . . . . . . . . . .Grounding Spr ing Pla te . . . . . . . . . . . . . . . . . . . . . . . . . .Fusing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fusing Assembly Component s . . . . . . . . . . . . . . . . . . . . . . .Efit Sensor Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Top Cover Sect ion (HP33440 shown) . . . . . . . . . . . . . . . . . . . .Top Cover Assembly Remova l, Method One . . . . . . . . . . . . . . . . .Top Cover Assembly Remova l, Method Two , . , . . . . . . . . . . . . . .Shut ter , Mir ror , and Erase Lamp Assemblies . . . . . . . . . . . . . . . .

6-76-86-96-96-106-116-136-136-146-156-166-176-186-196-206-216-226-236-246-256-266-276-286-296-306-316-326-336-346-356-366-376-386-396-416-416-426-436-446-456-46

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HP 33440/HP 33449 COMBINED

6-42.6-43.6-44.6-45.6-46.6-47.6-48.6-49.6-50.6-51.

Mir ror Holder . . . .E ra se bmp Assem bly

SERVICE

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. . . . .Fuser In su la tin g Cover Remova l .Delive~ Assembly RemovalSta t ic E limina tor . . . . .Deflect or P awls (Claws) . .Hinge Pla te Remova l . . .Bot iom Cover ComponentIn ter fa ce/F orma tt er PCA .DC Cont roller PCA . . . .

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Documents

HP LaserJet Classics II_III