PSR-550

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SERVICE MANUAL

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IMPORTANT NOTICE

This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed

that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known andunderstood by the users, and have therefore not been restated.

WARNING : Failure to follow appropriate service and safety procedures when servicing this product may result in

personal injury, destruction of expensive components and failure of the product to perform as

specified. For these reasons, we advise all Yamaha product owners that all service required should

be performed by an authorized Yamaha Retailer or the appointed service representative.

IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authoriza-tion,

certification, recognition of any applicable technical capabilities, or establish a principal-agent

relationship of any form.The data provided is believed to be accurate and applicable to the unit (s) indicated on the cover. The research engineering,

and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefor, inevitable

and changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to

exist, please contact the distributors Service Division.

WARNING : Static discharges can destroy expensive components. Discharge any static electricity your body

may have accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires

connect to this bus).

IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you applypower to the unit.

WARNING : CHEMICAL CONTENT NOTICE !

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic

(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency

(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY

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SPECIFICATIONS

Keyboards

61 standard-size keys (C1 C6) with

touch response.

Display

Large multi-function LCD display

Setup

STANDBY/ON Master Volume : MIN MAX

Demo

9 Songs

Realtime Controls Pitch Bend wheel

Control & Number Buttons

SONG STYLE MUSIC DATABASE VOICE L VOICE R1 VOICE R2 VOICE CHANGE

MIXER NEXT/BACK DIRECT ACCESS EXIT Data dial, [1] [0], [+/YES], [-/NO]

Overall Controls

Tempo : 32 280 Transpose

Voice

219 Panel Voices +14 Drum Kits + 480

XG Voices

Amplifiers

6W + 6W (when using PA-6 power

adaptor) 4.5W + 4.5W (when using batteries)

Speakers

12 cm (4-3/4") x 2, 3 cm (1-3/16") x 2

Power Consumption

22W (when using PA-6 power adaptor)

Power Supply

Adaptor : Yamaha PA-6 AC poweradaptor

Rated Voltage DC 10-12VRated Current 2A

Batteries : Six D size, R20P (LR20) orequivalent batteries

Dimensions (W x D x H)

952 x 387 x 169 (mm)(37-1/2" x 15-1/4" x 6-5/8")

Weight

8.7 Kg (19.2 lbs.) excluding batteries

Supplied Accessories

Data Disk Music Stand Owners Manual

Optional Accessories

Headphones : HPE-150 AC Power Adaptor : PA-6 Foot Switch : FC4, FC5 Keyboard Stand : L-6, L-7

Digital Effects

Reverb : 24 types

Chorus : 16 types DSP (system/insertion) : 74 types Harmony/Echo : 22 types

Registration Memory

32 Registration Banks : 1 4 Naming Accompaniment Freeze

Disk Operations

Song playback/recording Load (Style/Mult i Pad/Registrat ion

Memory) Save (Style/Mult i Pad/Registrat ion

Memory) Utility : Format, Song Copy, Delete File

Song

Song Volume Song Track Settings : ON/OFF Repeat Play Song Transpose

Song Recording

Quick Record, Multi Record Recording Tracks : 1 16 Punch In/Punch Out Quantize Naming Clear Setup Data : Volume, Octave, Pan, Reverb

depth, Chorus depth, DSP depth

Multi Pad Recording

User Pad Bank : 4 (41 44)

Naming

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CIRCUIT BOARD LAYOUT & WIRING

Speaker

(Woofer-L)L50

Speaker

(Tweeter-L)

W-STBW-ANAW-DMV

Speaker

(Woofer-R)

W-PNS

W-PNL

380

L40

W-MID

Lower case side

Upper case side

390

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Upper case side

390 370 360 W-LCD

W-EP2 W-ENC W-EP2 W-MVR W-PIT

AM

PN 1/5PN 2/5

PN 4/5 PN 5/5

PN 3/5

Speaker

(Tweeter-R)

Speaker

(Tweeter-L)W-STB390380W-PNL

FDD

W-PNS

W-PND

RED BLUE WHITE

Side view

Back Light Assembly & LCD390

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8

X100

7MHz

CL1

5MHz

X200

33.8688MHz

X800

16MHz

64M

IC230 44P

2,5,6,9,12,

15,16,19HC74

TR

CN150

9 15

SI[0 10]

YAMAHA PSR-55CN999 BACK LIGHT

Switch 2bit

IC700 16P

TO HOSTHOST SELECT

MIDI

IN OUT IF

12

9IC370 20P

7

4

158

PHONES/OUTPU

CN480

1/5

FOOT SWITCH

4-20,22

29-30,

52-54,

56-60,

62-64,

61-70

RESETIC190

84

/IC+5D

1-10,

14-21,

23-30,

32-42

1-3 8,9 2,12

1

2

3

2

5

6

9,12,15

16,19

3,4,7,8,13,

14,17,18

2-15,17-21,

18-21,24-28,

35-38

2-5,7-10,

18-21,

24-28,

35-38

32-35,47,48,50,

51,53,60,61

6

39-46

15

2

/IC

22

/IC

30

2-5,7-10,

18-21,24-27,

35-38,40-43

2-11,15-22,

24-31,34-44

MKS5 CN1

+5R

IC1 44P

CPU

MK-L MK-H

CN3 CN2 CN4

IC100 112P

IC260 44P

IC200 168P

IC270 28P

IC310 42PIC350 16P

IC800 64P IC999 14P IC700 20P

TR998

TR999

IC100 80P IC20

IC300 44P IC330 32P IC500 20PIC600 16P

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DISASSEMBLY PROCEDURE

3. DM Circuit Board, Shield Box U and L

(Time required : About 10 min.)

3 1 R h l bl (S d 1)

[430A] : Bind Head Tapping Screw-P 3.0X12 MFZN2Y (EP600300)

[440A] : Bind Head Tapping Screw-P 3.0X25 MFZN2Y (VK228100)

(Fig.1)

2. Spring Terminal


2 1 R h l bl (S d 1)

1. Lower Case Assembly


1-1. Remove the fourteen (14) screws marked [430A]

and the four (4) screws marked [440A]. The lower

case assembly can then be removed. (Fig. 1)

[430A] [430A] [430A]

[430A][430A]

[440A] [440A]

[430A] Lower Case AssemblyBattery Cover Assembly

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[420H] [450][420A]

[450] [420A] [450]

[L30]

[420H]X2

Speaker

(Tweeter)

Speaker

(Tweeter)

Speaker

(Woofer)

Speaker

(Woofer)

[L30]

DM AM

Shield Box L

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7. PN 1/5 Circuit Board


7-1. Remove the lower case assembly. (See procedure 1)

7-2. Remove the DM circuit board and the shield box

U and L. (See procedure 3)

PN 5/5

[420] : Bind Head Tapping Screw-P 3.0X8 MFZN2Y (EP600280)

(Fig.6)

[420D]

[420D] [420D]

[420E] [420D] [420D] [420C] [420D][420F]

Wheel Assembly

[420G]

PN 4/5PN 1/5 PN 5/5



6-1. Remove the lower case assembly. (See procedure 1)6-2. Remove the DM circuit board and the shild box U

and L. (See procedure 3)

6-3. Remove the AM circuit board. (See procedure 5)

6-4. Remove the volume knob from the control panel

side. (Fig. 7)6-5. Remove the three (3) screws marked [420C]. The

PN 4/5 circuit board can then be removed. (Fig. 6)




9-2. Remove the two (2) screws marked [420F]. The

PN 3/5 circuit board can then be removed with the

PN 2/5

PN 3/5

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11. Keyboard Assembly



11-2. Remove the two (2) screws marked [440B]. Thekeyboard assembly can then be removed. (Fig. 4)

12. Speakers(Time required : About 10 min.)12-1. Remove the lower case assembly. (See procedure 1)

12-2. Remove the right and left (woofer) speakers by

removing four (4) screws marked [L30] from each

speaker. (Fig. 4)

12-3. Remove the right and left (tweeter) speakers by

removing two (2) screws marked [420H] from eachspeaker. (Fig. 4)

13. LCD and Back Light Assembly



13-2. Remove the DM circuit board and the shield box

U and L. (See procedure 3)

13-3. Remove the floppy disk drive assembly.

(See procedure 4)13-4. Remove the AM circuit board. (See procedure 5)

13-5. Remove the PN 1/5 circuit board. (See procedure 6)

13-6. The LCD can then be removed with the back light

assembly. (Fig. 9)

15. Assembling the Keyboard Assembly15-1 Install the white keys CEGB from the lower notes,

and then install the DFA keys and C' key.

Afterwards install the black keys from the higher

notes, and tighten the twenty-one (21) screws

marked [140]. (Fig. 11)

15-2 Install the rubber contacts in the assembly while

pressing the keys as shown in Figure 12. Check

that the rubber contact has been firmly placed into

position in the area indicated by the arrow in Figure 13.

When fitting the rubber contacts, raise both ends

of the frame so that keys do not push the rubber

contact up.

15 3 ll h d i i b d i h

(Fig.11)

[140] : Bind Head Tapping Screw-P 3.0X16 MFZN2Y (EP600310)

[140]

[140]

Black Key

White Key

DFA

Black Key

White Key

CEGB

White Key C

Back Light Assembly LCD Rubber Connector

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LSI PIN DESCRIPTION

PD789022GB-A15-8E(XZ560100) CPU ........................................................................................... 13

HD6437042AF90F(XZ787100) CPU .................................................................................................. 14

HG73C205AFD(XU947C00) SWX00B(Tone Generator)................................................................... 15

HD63266F(XI939A00) FDC(Floppy Disk Controller) ......................................................................... 16

S6A0065B01-Q0RJ(XV993A00) LCD DRIVER ................................................................................. 16

S6A0069X10-Q0RJ(XV226A00) LCD DRIVER .................................................................................. 17

PCM1716E(XU829A00) DAC(Digital to Analog Converter) ............................................................... 13

PD789022GB-A15-8E(XZ560100) CPU MKS5 : IC1

PIN

NO. I/O FUNCTIONNAME

PIN

NO. I/O FUNCTIONNAME

123456789

10111213

P12P11P10

P47/KR7P46/KR6P45/KR5P44/KR4P43/KR3P42/KR2P41/KR1P40/KR0

NCIC

I/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/O

Port 1

Port 4/Key return signal detection input

Internally connected (N.C.)

23242526272829303132333435

P32/INTP2/CPT2P31/INTP1P30/INTP0P22/RXD/SI0

P21/TXD/SO0

P20/ASCK//SCK0P07P06P05P04P03P02P01

I/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/O

Port 3/External interrupt input/Capture edge input

Port 3/External interrupt input

Port 2/Asynchronous serial interface serial data input/Serial interface serial data inputPort 2/Asynchronous serial interface serial data output/Serial interface serial data outputPort 2/Asynchronous serial interface serial clock input/Serial interface serial clock

Port 0

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DM : IC100HD6437042AF90F(XZ787100) CPU

PIN

NO.I/O FUNCTIONNAME

PIN

NO.I/O FUNCTIONNAME

123456789

101112131415161718192021222324

25262728293031323334353637

TIOC4/DACK0/PE14

PE15VSSA0A1A2A3A4A5A6A7A8A9

A10A11A12A13A14A15A16VCCA17VSS

/RAS/PB2/CASL/PB3

/CASH/PB4

VSS/RDWR / PB5

A18//BACK/PB6A19//BREQ/PB7A20/PB8A21/PB9

VSS/RD

/WDTOVF

VCC

I/OOIOOOOOOOOOOOOOOOOOIOI

I/O

I/OI/OI

I/OI/OI/OOOIOOOI

MTU I/O / DMA acknowledge / Port EPort EGround

Address bus

Power supplyAddress busGroundRow address strobe / Port B

Column address strobe (low) / Port BColumn address strobe (high) / Port BGroundDRAM read / write / Port BAddress bus / Bus acknowledge / Port BAddress bus / Bus request / Port B

Address bus/ Port B

GroundReadWatch dog timer overflowHigh write / Port APower supply

575859606162636465666768697071727374757677787980

81828384858687888990919293

D11D10D9D8

VSSD7D6D5

VCCD4D3D2D1D0

VSSXTALMD3

EXTALMD2NMIVCCMD1MD0

PLLVCC

PLLCAPPLLVSSPA15 / CK

/RESPE0/DREQ0PE1/DRAK0

PE2PE3PE4VSS

PF0 / AN0PF1 / AN1PF2 / AN2

I/OI/OI/OI/OI

I/OI/OI/OI

I/OI/OI/OI/OI/OIIIIIIIIII

IIOI

I/OOOOOIIII

Data bus

Ground

Data bus

Power supply

Data bus

GroundCrystal oscillatorMode controlCrystal oscillatorMode controlNon-maskable interrupt requestPower supplyMode controlMode controlPLL Power supply

PLL capacitorPLL GroundPort A / ClockPower on resetPort E / DMA requestPort E / DMA acknowledge

Port E

Ground

Port F / Analog input/WRH/PA13

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HG73C205AFD(XU947C00) SWX00B(Tone Generator) DM : IC200

1 ICN I Initial clear 85 CMA3 O Program address bus2 RFCLKI I PLL Clock 86 CMA8 O Program address bus3 TM2 I PLL Control 87 CMA2 O Program address bus4 AVDD_PLL Power supply 88 CRD O read signal5 AVSS_PLL Ground 89 CMA1 O Program address bus6 MODE0 I SWX dual mode 90 CUB O high byte effective signal7 VCC7 Power supply 91 VCC91 Power supply8 GND8 Ground 92 GHND92 Ground9 XIN I crystal oscillator 93 CS1 O CS signal

10 XOUT O crystal oscillator 94 CMA0 O Program address bus11 MODE1 I SWX separate mode 95 CLB O low byte effective signal12 TEST0 I TEST pin 96 CMA12 O Program address bus13 TESTON I TEST pin 97 CMA11 O Program address bus14 AN0-P40 I A/D converter 98 CMA10 O Program address bus

15 AN1-P41 I A/D converter 99 CMA9 O Program address bus16 AN2-P42 I A/D converter 100 GND100 Ground17 AN3-P43 I A/D converter 101 CWE O write signal18 AVDD_AN Power supply 102 CMA16 O Program address bus19 AVSS_AN Ground 103 CMA15 O Program address bus20 TXD0 O for MIDI or TO-HOST 104 CMA14 O Program address bus21 TXD1 O for MIDI 105 CMA13 O Program address bus22 EXCLK I Crystal oscillator 106 CMD8 I/O Program memory Data bus23 SMD11 I/O Wave memory data bus 107 CMD7 I/O Program memory Data bus24 SMD4 I/O Wave memory data bus 108 CMD9 I/O Program memory Data bus25 SMD3 I/O Wave memory data bus 109 CMD6 I/O Program memory Data bus26 SMD12 I/O Wave memory data bus 110 CMD10 I/O Program memory Data bus27 SMD10 I/O Wave memory data bus 111 CMD5 I/O Program memory Data bus28 SMD5 I/O Wave memory data bus 112 CMD11 I/O Program memory Data bus29 SMD2 I/O Wave memory data bus 113 CMD4 I/O Program memory Data bus

30 SMD13 I/O Wave memory data bus 114 CMD12 I/O Program memory Data bus31 SMD9 I/O Wave memory data bus 115 CMD3 I/O Program memory Data bus32 SMD6 I/O Wave memory data bus 116 CMD13 I/O Program memory Data bus33 SMD1 I/O Wave memory data bus 117 CMD2 I/O Program memory Data bus34 SMD14 I/O Wave memory data bus 118 CMD14 I/O Program memory Data bus35 VCC35 Power supply 119 VCC119 Power supply36 GND36 Ground 120 GND115 Ground37 SMD8 I/O Wave memory data bus 121 CMD1 I/O Program memory Data bus38 SMD7 I/O Wave memory data bus 122 CMD15 I/O Program memory Data bus39 SMD0 I/O Wave memory data bus 123 CMD0 I/O Program memory Data bus40 SMD15 I/O Wave memory data bus 124 CMA21 O Program address bus41 SOE O read signal 125 PDT15 I/O SWX access data bus42 SWE O write signal 126 PDT14 I/O SWX access data bus43 SRAS O RAS signal 127 PDT13 I/O SWX access data bus44 SCAS O CAS signal 128 PDT12 I/O SWX access data bus

PIN

NO.

NAME I/O FUNCTIONPIN

NO.

NAME I/O FUNCTION

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HD63266F(XI939A00) FDC(Floppy Disk Controller)

S6A0065B01-Q0RJ (XV993A00) LCD DRIVER

DM : IC800

PN : IC200

PIN

NO.123456789

101112131415161718192021222324

2526272829303132

I/O

IIIIIIIII

I/OI/OI/OI/OI/OI/OI/OI/OOOI

IIIIIII

8"//5"XTALSET

/RESETE//RD

RW//WR/CS

/DACKRS0RS1

VSS1VSS2

D0D1D2D3D4D5D6D7

/DREQ/IRQ

/DENDVSS3

1/2 EX1

VCC1NUM1NUM3

IFSSFORM

/INP/READY/WPRT

NAME

Data transmission speedClock selectRestEnable/ReadRead/write/WriteChip selectDMA acknowledge

Register select

Ground

Data bus

DMA requestInterrupt requestData endGround

Power supply

Host interface selectFormat dataIndex pulseReady from FDDWrite control signal

FUNCTIONPIN

NO.333435363738394041424344454647484950515253545556

5758596061626364

I/O

III

OO

OOOO

OO

OO

OOOO

/TRKO/INDEX/RDATA

XTAL2EXTAL2

NCXTAL1

EXTAL1VSS4VSS5

NCVCC2VCC3VCC4

/WGATE/WDATA

VSS6/STEP/HDIR

/HLOAD/HSELVSS7/DS0/DS1

/DS2/DS3VSS8

/MON0/MON1/MON2/MON3

VSS9

NAME

Track 00 signalIndex signalRead data input from FDD

Clock

Clock

Ground

Power supply

Write controlWrit data to FDDGroundStep signal to control head of FDDDirectionHead loadHead selectGround

Drive select

Ground

Motor on

Ground

FUNCTION

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S6A0069X10-Q0RJ(XV226A00) LCD DRIVER PN : IC100

PIN

NO.123456789

101112131415161718192021222324

25262728293031323334353637

I/O

OOOOOOOOOOOOOOOOOOOOOO

I

O

OO

OOII

S22S21S20S19S18S17S16S15S14S13S12S11S10S9S8S7S6S5S4S3S2S1Vss

OSC1

OSC2V1V2V3V4V5

CLK1CLK2VddMD

RSR/W

NAME

Segment signal output for LCDdriving

GroundOscillator

Oscillator

Power supply

Data latch clockData shift clockPower supply (+5 V)Altamated signal for LCD driver outoutDisplay data interface

Read/write

FUNCTIONPIN

NO.414243444546474849505152535455565758596061626364

65666768697071727374757677

I/O

I/OI/OI/OI/OI/OI/OOOOOOOOOOOOOOOOOOO

OOOOOOOOOOOOO

DB2DB3DB4DB5DB6DB7C1C2C3C4C5C6C7C8C9

C10C11C12C13C14C15C16S40S39

S38S37S36S35S34S33S32S31S30S29S28S27S26

NAME

Data interface

Common signal output for LCDdriving

Segment signal output for LCDdriving

FUNCTION

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M5243AP06(XU911A00)

Graphic EqualizerAM : IC370

LA4705NA(XQ619A00)

Power AmplifierAM: IC400

1IN 1-1

2

3

4

5

6

7

8

9

10

NF 1-1

IN 2-1

NF 2-1

IN 3-1

NF 3-1

Non-Inverting

input-1

Inverting

input-1

Output-1

GND

Non-Inverting

input-1

Inverting

input-1

Output-1

GND11

12

13

14

15

16

17

18

19

20 IN 1-2

NF 1-2

IN 2-2

NF 2-2

IN 3-2

NF 3-2

R

65k

1.2k

65k

1.2k

65k

1.2k

47k

R1

- + -+

Vret

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CIRCUIT BOARDS

DM Circuit Board

to AM-CN800 to AM-CN530 to AM-CN100 to MKS5-CN1

toPN1

/5-CN101

to

PN1

/5-CN102

toFDDA

ss'y

Ass'y

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DM Circuit Board

PSR 550

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PN 1/5 Circuit Board

to DM-CN650

to PN 2/5-CN602

to DM-CN750 to DM-CN960

A

AA

PSR 550

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PN 1/5 Circuit Board

B

B

PSR 550

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AM Circuit Board

FOOT SWITCHMIDIHOST SELECTTO HOSTto DM-CN170

1999

IN OUTC

PSR 550

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Component side

DC-IN10-12VPHONES/OUTPUTto DM-CN250

20

toPN

5/5-CN701

toBATTERY

C

PSR-550

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MK-L Circuit Board

to MK-HD

D

E

E

D

D

E

PSR-550

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MK-H Circuit Board

to MKS5-CN4

to MK-L

F

F

G

G

F

F

G

PSR-550

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TEST PROGRAM

1. PREPARATION

1) PA-6 (AC adaptor) is used.

2) The volume is usually moved to the use position when no

volume change is required.

3) Measuring instruments:frequency counter, level meter

(with JIS-C filter)

Note : Connect a stereo plug to the [PHONES/OUTPUT]

jack at 33 ohms.

4) Jigs : foot switch, MIDI cable, floppy disk (2HD & 2DD)

2. HOW TO ENTER THE TEST PROGRAM

MANUAL MODE :

While pressing the C2#, F2 and G2# keys, turn the

[STANDBY/ON] switch on.

3. PROCEEDING THROUGH THE TEST

PROGRAM

MANUAL MODE :

1) When the test program is started, TEST appears on

the LCD.

2) Select the test program item to be executed by pressing

the [BACK] or [NEXT] button.

3) Press the [START/STOP] button to execute testing.

When the test result is OK, press the [START/STOP]

button to return to the test item name on display.Proceed to the next test by pressing the [BACK] or

[NEXT] button.When the test result is OK, an asterisk

(*) is added in front of its item name on display.

When the test result is NG, press the [DEMO] button or

the lowest (leftmost) white key on the keyboard to return

to the test item name on display and then turn off the

[STANDBY/ON] switch to end the test program.

4. TEST PROGRAM LIST

TEST No. LCD (initial) Test Functions and Judgment Criteria

1 001:Version Displays ROM version.

ROM (Program, Wave) versions are displayed alternately on the LCD.

2 002:RomChk1 Checks the ROM.

The test results appear on the LCD.

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19 019:D/ANoise Connect the level meter (with a JIS-C filter) to the [PHONES] jack. (33 ohm load)

Set the [MASTER VOLUME] at maximum. Check D/A converter noise.PHONES L/R :Less than -80.0 dBm

20 020:SW,LEDChk Check the switches on the panel and LED.

Press the switches on the LCD as instructed. A pre-assigned note is output when the

switch is pressed. (See table 1.) When the switch with LED is pressed, that LED will

light up. As the check result appears on the LCD when all the switches are pressed as

instructed. Check that OK is displayed. For the dial check, confirm that turning the

data dial clockwise will increase the figure in the range of 0 to 100 and turning it

counterclockwise will reduce it. (To stop this check before reaching its end, press thelowest (leftmost) white key on the keyboard to return to the test item name on display.)

21 021:AllLEDOn Check that the all LEDs on the panel are on.

22 022:RedLEDOn Check that the all red LEDs on the panel are on.

23 023:GreenLEDOn Check that the all green LEDs on the panel are on.

28 028:AllLCDOn Check that all LCD dots are on.

29 029:AllLCDOff Check that all LCD dots are off.

30 030:LCDBacLig Lighting (color) check of LCD back light.

Press the [DIRECT ACCESS] button and check that the back light color changes in theorder of violet, red, OFF and blue.

32 032:Pedal1Chk Connect the foot switch (FC-4 or FC-5) to the [FOOT SWITCH] jack.

Check that the C3 note is output when pressing and releasing the pedal and the C4 note

is output when pressing the pedal again.

34 034:PBWheelChk Check that the C3 note is output when rotating the [PITCH BEND] wheel to minimum

and the C4 note is output when rotating it to maximum.

38 038:MidiChk After connecting the [MIDI IN] jack and [MIDI OUT] jack with a MIDI cable, execute

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* NOTE : The above tests Nos. 42-47, require approximately 25 minutes to conduct.

If the time is not available to perform the tests, proceed the test No.48 by pressing several the [NEXT] button.

48 048:FactorySet All the RAMs are initialized and set to the factory preset data when executing this test.

The results appear on the LCD.49 049:TestExit Exit from the test program after executing this test.

TABLE 1

ORDER SWITCH LCD NOTE

1 DSP Push DSP C3

2 DSP FAST/SLOW Push Fast/Slow C#3

3 TOUCH Push Touch D3

4 SUSTAIN Push Sustain D#3

5 HARMONY Push Harmony E3

6 BACK Push Back F3

7 NEXT Push Next F#3

8 DIRECT ACCESS Push Direct Acces G39 VOICE CHANGE Push Voice Change G#3

10 MIXER Push Mixer A3

11 Track 1 Push Track 1 A#3

12 Track 2 Push Track 2 B3

13 Track 3 Push Track 3 C4

14 Track 4 Push Track 4 C#4

15 Track 5 Push Track 5 D4

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ORDER SWITCH LCD NOTE

39 EXIT Push Exit D3

40 DEMO Push Demo D#341 RECORD Push Record E3

42 SONG Push Song F3

43 STYLE Push Style F#3

44 MUSIC DATABASE Push MDB G3

45 VOICE L Push Voice L G#3

46 VOICE R1 Push Voice R1 A3

47 VOICE R2 Push Voice R2 A#3

48 ACMP ON/OFF Push Acmp On/Off B3

49 ACMP/SONG VOLUME Push Acmp Volume C4

50 TEMPO/TAP Push Tempo/Tap C#4

51 TRANSPOSE Push Transpose D4

52 FUNCTION Push Function D#4

53 PART ON/OFF VOICE L Push Part Voice L E4

54 PART ON/OFF VOICE R1 Push Part Voice R1 F4

55 PART ON/OFF VOICE R2 Push Part Voice R2 F#456 LOAD Push Load G4

57 SAVE Push Save G#4

58 UTILITY Push Utility A4

59 SYNC STOP Push Sync Stop A#4

60 SYNC START Push Sync Start B4

61 START/STOP Push Start/Stop C5

62 INTRO Push Intro C#5

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Even though these settings are retained in memory, you

should save them and all your important data to

floppy disk for permanent, safe storage. To save all of the

data types listed above to floppy disk, use the Save

operation and select All as the file type.

Data Backup

Except for the data listed below, all PSR-550 panel settings are reset to their initial settings whenever the power is turned

on. The data listed below are backed up - i.e. retained in memory - as long as an AC adaptor is connected or a set of batteriesis installed.

User Style data

User Pad data

Registration Memory data

Registration Memory Bank Number

Registration Memory/One Touch Setting status

Freeze on/off

MIDI Transmit settings

MIDI Receive settings

Voice Set on/off

Voice L (Voice Change, Mixer)

Fingering mode

Split Point

Sustain on/off

Upper Octave setting

Pitch Bend Range

Scale Tuning

Transpose

Footswitch Function, Polarity

Touch on/off, Sensitivity

Multi Pad setting

Master Tuning

Metronome on/off

All data listed above will be lost if the power is interrupted

in other words, if the power is turned off, the AC adaptor

is disconnected and the batteries are removed. When this

happens, the next time you turn on the PSR-550, a Clear

Backup message appears in the display, the Data

Initialization operation (below) is automatically executed,

and the PSR-550 is set to the Style mode.

Data Initialization

All data can be initialized and restored to the factory preset condition by turning on the power while holding the highest

DATA BACKUP & INITIALIZATION

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ALERT MESSAGE LIST

No File

Unformatted Disk

Disk Error

Write-protected

File Protected

No Disk

Disk Removed

The disk contains no file to be loaded, copied, or be deleted.

Insert the disk that contains files to be loaded, copied, or deleted.

Insert Song Disk

An unformatted disk is inserted.

An error occurred during execution of a disk operation.

Try changing the disk.

This message also may appear when executing the Load operation if

the internal memory becomes full.

The floppy disks write-protect tab is set to ON.Remove the disk, set write-protect to off, reinsert the disk and attempt

the operation again.

The file is a purposely copy-protecteddisk.

The Copy function is not possible.

There is no floppy disk inserted into the disk drive.

Insert a disk.

This message appears when you press the [SONG] button without a

disk in the disk drive.

An error occured because the disk was removed during a disk opera-

tion.

Never remove a disk during a disk operation since this could damage

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Memory OverThis message appears when executing the Quantize or Recordingoperations (in the Style Recording mode) when the internal memory

is full.

Cannot Operate

Cannot Set MIDI

CannotTurnHar.On

CannotTurnDSP On

Data Not Found

User Style Full

Preset Data

This message appears when you attempt to edit, quantize or clear

the track which contains no data in the Record mode.

This message indicates that recording a new User style cannot bestarted when all three User styles have recorded data. Make sure to

clear at least one of the three User styles before recording a newUser style.

This message appears when you attempt to edit, or quantize the

track (other than RHYTHM) which contains preset data in the StyleRecord mode.

This function cannot be used during Song/Style/Pad recording.

The MIDI function cannot be set during recording, playback, anddisk operations.

Harmony cannot be turned on during Style/Pad recording.

DSP cannot be turned on during Style/Pad recording.

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MIDI IMPLEMENTATION CHART

[Portable Keyboard] Date : 30-NOV-2000

Model : PSR-550 MIDI Implementation Chart Version : 1.0

Function... Transmitted Recognized Remarks

Basic Default 1 - 16 *1 1 - 16 *2

Channel Changed 1 - 16 *1 1 - 16 *2

Default 3 3

Mode Messages x x

Altered ************** x

Note 0 - 127 0 - 127

Number : True voice ************** 0 - 127

Velocity Note ON o 9nH,v=1-127 o 9nH,v=1-127

Note OFF x 9nH,v=0 x

After Keys x x

Touch Chs x o

Pitch Bend o o

0,32 o o Bank Select

1,5,11 x o

7,10 o o

6,38 o o Data Entry

Control 64,66-67 o o

65 x o Portamento

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PARTS LIST

CONTENTS

OVERALL ASSEMBLY............................................................................................................................. 2

KEYBOARD ASSEMBLY 5

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REF NO. PART NO. DESCRIPTION REMARKS QTY RANK

OVERALL ASSEMBLY PSR-550 (V703480)

*

10 Upper Case Assembly10a Upper Case (V703910)

* 10b Speaker Grille LEFT

* 10c Speaker Grille RIGHT

10d Vibration-proof Tape 18X25 2 03

10e Spacer L100 (V384790) 12

20 Speaker 3.0cm TWEETER 2 02

30 Holder (V364540) 2

40 Sponge (V364550) 2

* 50 Panel Switch x1 IVORY ACMP ON/OFF,FINGERING, 8

TEMPO/TAP,TRANSPOSE,ACMP/

SONG VOLUME,VOICE L/R1/R2

*60 Panel Switch x3 BLUE LOAD,SAVE,UTILITY

* 70 Panel Switch x7 IVORY/RED SYNC. STOP,SYNC START,

START/STOP,INTRO,MAIN/

AUTO FILL ENDING/rlt.

* 80 Panel Switch x7 IVORY/RED REGISTRATION MEMORY M/1-4

* 90 Panel Switch x5 IVORY MULTI PAD 1-4,STOP

* 100 Panel Switch x1 IVORY DEMO

* 110 Panel Switch x1 RED RECORD

* 120 Panel Switch x6 BLUE FANCTION,SONG,STYLE,

VOICE L/R1/R2

* 130 Panel Switch x16 IVORY Display Select TRACK 1-16

* 140 Panel Switch x1 BLUE DIRECT ACCESS,EXIT 2

* 150 Panel Switch x7 BLACK/IVORY DSP,FAST/SLOW,TOUCH,SUSTAIN,HARMONY/ECHO,

BACK,NEXT

* 160 Panel Switch x12 BLACK 0-9,NO/-,YES/+

* 170 Panel Switch x1 IVORY VOICE CHANGE,MIXER 2

* 180 LCD TTR

190 Rubber Connector SS-174W 2 01

* 200 Back Light Assembly PT

210 Wheel Assembly (VT48770)

210a Wheel BLACK PITCH BEND 03

210b Spring 03

* 220 Circuit Board PN (1/5 5/5)

--

V7 03 89 00

--

V7 03 87 00

V7 03 88 00

VJ 86 15 00

--

XV948A00

--

--

V7 04 41 00

V7 40 48 00V7 04 42 00

V7 04 43 00

V7 04 44 00

V7 04 45 00

V7 04 46 00

V7 40 49 00

V7 04 47 00

V7 40 54 00

V7 04 48 00

V7 37 83 00

V7 04 49 00

V7 12 67 00

V3 83 68 00

V7 04 25 00

--

VT 36 64 00

VT 44 01 00

V7 01 96 00

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F50 Bushing 4 01

F60 Adhesive Tape ECT #590S W=15 (ZL35000)

Lower Case with Speaker (V703900)

* L10 Lower Case Assembly

L10a Lower Case (V703940)

L10b Foot T1.6 BLACK 5 01

L10c Cushion 1X15X875 (V704140) 2

L10d Speaker Box L (V704110)

L10e Speaker Box R (V704120)

L10f Bind Head Tapping Screw-P 4.0X10 MFZN2Y 45 01

L10g Dust Proof Cloth (V720600) 6

L20 Speaker 12.0cm 4 ohm 6W WOOFER 2 06

L30 Bind Head Tapping Screw-P 4.0X8 MFZN2BL 8 01L40 Connector Assembly SPW XH 4P (V381950)

L50 Connector Assembly BAT XH 2P (V705790)

* L60 Spring Terminal 5

* L70 Spring Terminal (+)

* L80 Spring Terminal (-)

L90 Adhesive Tape 12X50 11 03

L100 Vibration-proof Tape 18X25 4 03

L130 Nonworen Fabric Cloth 40X13X0.5 (V771130) 6

L140 Nonworen Fabric Cloth 13X13X0.5 (V771140)

ACCESSORIES

Music Rest 07* Floppy Disk 3.5inch

* AC Adapter PA-6(B) J J

AC Adapter PA-6 CHN O 16

* Japanese Guide Sheet J

* Chinese Guide Sheet O

VA12 16 00

--

--

V7 03 93 00

--

CB043750

--

--

--

EP640500

--

XT278A00

VB 93 16 00--

--

V7 06 02 00

V7 06 05 00

V7 06 07 00

VA12 61 00

VJ 86 15 00

--

--

VU 4695 00

V7 03 78 00

V6 95 20 00

VZ 42 84 00

V7 03 80 00

V7 03 81 00

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* KEYBOARD ASSEMBLY 16M C61 P2M MKS5 PSR-550V7 12 71 00

KEYBOARD ASSEMBLY

140

90

60

60b

60a

50

110

30S7

S2

S6

S4

S5

S1

S3

80

100

120

160

120

120

120

120

130

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ELECTRICAL PARTS


ELECTRICAL PARTS PSR-550

Circuit Board AM (XV935C0) 27

* Circuit Board DM (XZ670D0)

Circuit Board MK-H (XR565C0) 09

Circuit Board MK-L (XR564C0) 09

* Circuit Board MKS5 (XZ594A0)

* Circuit Board PN (XV934B0)

Circuit Board AM (XV935C0) 27

Heat Sink 05

Jumper Wire 0.55 (VA07890)

C0100 Semiconductive Cera. Cap. 0.1000 25V Z 01

C0111 Mylar Capacitor 0.0680 50V J 02

-0113 Mylar Capacitor 0.0680 50V J 02C0121 Mylar Capacitor 0.0680 50V J 02

-0123 Mylar Capacitor 0.0680 50V J 02

C0301 Electrolytic Cap. 100.00 25.0V 01




C0312 Electrolytic Cap.-BP 10.00 16.0V 01


C0322 Electrolytic Cap.-BP 10.00 16.0V 01



C0370 Semiconductive Cera. Cap. 0.1000 25V Z 01C0371 Monolithic Mylar Capacitor ECQ-V1H224JL3 01




C0375 Mylar Capacitor 4700P 50V J 01


C0377 Ceramic Capacitor-B 1500P 50V K 01


C0381 Monolithic Mylar Capacitor ECQ-V1H224JL3 01


C0383 Mylar Capacitor 0 0100 50V J 01

V3 62 30 00

V7 01 94 00

VV 58 39 00

VV 58 38 00

V7 11 22 00

V7 01 96 00

V3 62 30 00

VV 85 64 00

--

VC 6948 00

UA654680

UA654680UA654680

UA654680

UR848100

UR848100

UR837100

UA654100

UN837100

UA654100

UN837100

UR866470

UR866470

VC 6948 00VR 16 87 00

UA654220

UA654100

UA654270

UA653470

UA654150

FG613150

UR837470

VR 16 87 00

UA654220

UA654100

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CN100 Cable Holder 51048 4P TE 01

CN390 Wire Trap 52147 5P TE 01

CN480 Base Post Connector XH 4P TE 01





Z D0501 Diode 20E1-FC4 01

Z D0502 Diode 20E1-FC4 01

D0610 Diode 1SS133,1SS176 01

-0814 Diode 1SS133,1SS176 01

IC100 IC UPC4572HA OP AMP 02

IC300 IC AN78L06 REGULATOR +6V 01IC370 IC M5243AP06 EQUALIZER 03

IC400 IC LA4705NA 17W BTL POWER AMP. 05

IC700 IC SN75C1168N LINE TRANSCEIVER 05

IC810 IC TC74HCU04AP INVERTER 02

IC810 IC SN74HCU04N 01

J0411 Jumper Wire 0.55 (VA07890)






J0503 Jumper Wire 0.55 (VA07890)JK490 Phone Jack YKB21-5006 PHONES/OUTPUT 03

Z JK500 Connector HTJ-020-05AZ DC-IN 10-12V

JK610 DIN Connector 5P YKF51-5050 MIDI IN 01

JK620 DIN Connector 5P YKF51-5050 MIDI OUT 01

JK700 DIN Connector DIN 8P MD-S810 TO HOST 03

JK900 Phone Jack YKB21-5012 BLACK FOOT SWITCH 02

L0471 Coil FL5R200QNT 20uH 01

L0471 Choke Coil R-5C.20U 20uH 01

L0471 Choke Coil R-5C.20U 20uH 01

L0481 Coil FL5R200QNT 20uH 01

L0481 Choke Coil R 5C 20U 20uH 01

VC69 48 00

V I 878 200

VK 02 49 00

LB918040

LB918020

VF 72 83 00

V I 878 300

V I 878 500

VL 72 36 00

VL 72 36 00

VB 94 12 00

VB 94 12 00

XF63 3A00

XE924A00XU9 11A00

XQ619A00

XU4 63A00

IG142200

IG142250

--

--

--

--

--

--

--LB101870

V6 55 76 00

VJ 10 72 00

VJ 10 72 00

VM761000

VB 31 26 00

VB 83 50 00

V2 88 95 00

V2 99 34 00

VB 83 50 00

V2 88 95 00

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R0124 Jumper Wire 0.55 (VA07890)

R0300 Carbon Resistor 47.0 1/4 J 01

R0301 Carbon Resistor 2.2K 1/4 J 01











R0373 Carbon Resistor 680.0 1/4 J 01R0374 Carbon Resistor 18.0K 1/4 J 01











R0387 Carbon Resistor 2.7K 1/4 J 01R0401 Carbon Resistor 10.0K 1/4 J 01










R0472 Carbon Resistor 330 0 1/4 J 01

--

HF754470

HF756220

HF756220

HF755150

HF755150

HF757100

HF755560

HF757100

HF755560

HF756270

--

HF757220

HF755680HF757180

HF755470

HF757180

HF756270

HF756270

--

HF757220

HF755680

HF757180

HF755470

HF757180

HF756270HF757100

HF757180

HF756680

HF757180

HF756680

HF753220

HF753220

HF753220

HF753220

HF755100

HF755330

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* Circuit Board DM (XZ670D0)

Bind Head Tapping Screw-B 3.0X8 MFZN2BL 2 01








C0124 Ceramic Cap.-B 100P 50V K 01



C0176 Ceramic Cap.-B 100P 50V K 01C0181 Semiconductive Cera. Cap. 0.1000 25V Z 01







-0203 Semiconductive Cera. Cap. 0.1000 25V Z 01



C0208 Ceramic Capacitor-SL 27P 50V J 01

C0209 Semiconductive Cera. Cap. 0.1000 25V Z 01C0211 Semiconductive Cera. Cap. 0.1000 25V Z 01




-0261 Semiconductive Cera. Cap. 0.1000 25V Z 01






C0277 Mylar Capacitor 0 0220 50V J 01

V7 01 94 00

EP600190

VC69 48 00

UR837100

VC69 48 00

VC69 48 00

UR837100

FG612470

FG612470

FG612100

VC69 48 00

VC69 48 00

FG612100VC69 48 00

FG612470

FG612470

FG612100

FG612100

FG612100

VC69 48 00

VC69 48 00

UR828100

VC69 48 00

FG651270

VC69 48 00VC69 48 00

VC69 48 00

UR847100

VC69 48 00

VC69 48 00

UR828100

VC69 48 00

UR837100

UR866470

VC69 48 00

UA654220

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CA151 Ceramic Capacitor Array 100P 50V M 01


* CA171 Ceramic Capacitor Array 470P 50V M









CN750 Wire Trap 52147 12P TE 01CN850 Connector 34P TE 03

CN850 Connector Header 302A 34P TE 05




CN999 Connector Base Post PH 6P TE 01

D0901 Diode RK33 01

D0911 Diode 1SS133,1SS176 01

D0912 Diode 11ES4 01

D0931 Diode 1SS133,1SS176 01

* IC100 IC HD6437042AF90F CPU

IC190 IC IC-PST591D-2 SYSTEM RESET 02IC200 IC HG73C205AFD TONE GENERATOR (SWX00B) 09

* IC230 IC MASK ROM 64M WAVE

IC250 IC S-81250SGY-Z REGULATOR +5V 02

IC260 IC MSM514260C-60TS-K DRAM 4M 16

IC260 IC SDM4260CLTM-6S 08

IC270 IC PCM1716E DAC 06

IC290 IC UPC29M33HF REGULATOR 03

IC300 IC MSM514260C-60TS-K DRAM 4M 16

IC300 IC SDM4260CLTM-6S 08

* IC310 IC MASK ROM 32M PROGRAM

IC330 IC UPD431000AGW 70LL SRAM 1M 07

VC 6948 00

VC 6948 00

VH 4839 00

VK 99 49 00

V4 65 42 00

VH 2856 00

VH 2856 00

VK 02 55 00

VK 02 51 00

VF 72 83 00

VK 02 48 00

VF 72 82 00

VK 02 52 00

VK 02 56 00

VQ391300

V3 85 87 00

VK 02 49 00

LB918030

LB918020

VB 39 02 00

V2 32 03 00

VB 94 12 00

VB 48 19 00

VB 94 12 00

XZ 78 71 00

XR9 02A00XU947C00

XZ 78 61 00

XT625A00

XT810A00

XW125A00

XU8 29A00

XT333A00

XT810A00

XW125A00

XZ 78 52 00

XT138A00

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-0123 Carbon Resistor 47.0K 1/4 J 01









-0176 Carbon Resistor 1.0K 1/4 J 01



R0183 Carbon Resistor 1.0K 1/4 J 01R0184 Carbon Resistor 100.0 1/4 J 01











R0271 Carbon Resistor 220.0 1/4 J 01-0274 Carbon Resistor 220.0 1/4 J 01






-0355 Carbon Resistor 100.0 1/4 J 01


-0515 Carbon Resistor 47.0 1/4 J 01


R0553 Carbon Resistor 1 0K 1/4 J 01

HF757470

HF757470

HF755100

HF756100

HF756100

HF758470

HF758470

HF757100

HF757100

HF756100

HF756100

HF757470

HF756100

HF756100

HF755100

HF755100

HF757470

HF757470

HF757100

HF757100

HF754680

HF757470

HF757470

HF754330

HF756100

HF755220HF755220

--

HF755180

HF755180

HF755100

HF755100

HF755100

HF754470

HF754470

HF757100

HF756100

PSR-550

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TR999 Transistor 2SC3581 E 01

X0100 Ceramic Resonator 7MHz EFOMC7004A4 01

X0200 Quartz Crystal Unit DOC-49S5 05

X0800 Ceramic Resonator 16MHz EFOEX1605X4 01

ZD911 Zener Diode MTZ J 10.0B 10.0V 01

ZD911 Zener Diode MTZJ10B 10.0V 01

Circuit Board MK-H (XR565C0) 09

Wire Trap 52147 12P TE 01

Wire Trap 52147 5P TE 01

Diode 1N4148(DO-34) 01

Circuit Board MK-L (XR564C0) 09

Wire Trap 52147 12P TE 01Wire Trap 52147 7P TE 01

Diode 1N4148(DO-34) 01

* Circuit Board MKS5 (XZ594A0)

Vibration-proof Tape 10X64X0.5 (VK34680)

Jumper Wire 0.55 (VA07890)


-3 Ceramic Capacitor-SL 22P 50V J 01


-3 Ceramic Capacitor-SL 22P 63V J 01


C5 Semiconductive Cera. Cap. 0.1000 25V Z 01C5 Semiconductive Cera. Cap. 0.1000 25V Z 01

CA1 Ceramic Capacitor Array 100P 50V K 02

CA2 Ceramic Capacitor Array 100P 50V K 02

* CL1 Ceramic Resonator 5.00M EF0EC5004T4Q





* IC1 IC UPD789022GB-A15-8E CPU


3 Carbon Resistor 47 0K 1/4 J 01

V3 37 55 00

V3 79 75 00

VV 34 55 00

V3 68 14 00

VG43 9500

VQ296000

VV 58 39 00

VK 02 56 00

VK 02 49 00

VV 43 78 00

VV 58 38 00

VK 02 56 00

VK 02 51 00

VV 43 78 00

V7 11 22 00

--

--

FG651220

FG651220

VR 02 74 00

VR 02 74 00

UR828100

VC 6948 00VM902400

VP 75 52 00

VP 75 52 00

V6 78 14 00

VF 72 83 00

VK 02 56 00

VK 02 51 00

VK 02 49 00

XZ 56 01 00

HF456470

HF457470

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LE205 LED Red SLZ-190B-01 ACCOMPANIMENT 01

LE301 LED Green SLZ-290B-10-T2 REGISTRATION MEMORY 01

LE302 LED Red SLZ-190B-10-T2 ENDING/rit. 01

LE303 LED Red SLZ-190B-10-T2 MAIN/AUTO FILL B 01

LE304 LED Red SLZ-190B-10-T2 MAIN/AUTO FILL A 01

LE305 LED Red SLZ-190B-10-T2 INTRO 01

LE401 LED Red SLZ-190B-10-T2 FREEZE 01

LE402 LED Red SLZ-190B-11-T1 ACMP ON/OFF 01

LE403 LED Red SLZ-190B-11-T1 RECORD 01

LE404 LED Red SLZ-190B-06-T2 VOICE CHANGE 01

LE405 LED Red SLZ-190B-06-T2 MIXER 01



R0901 Carbon Resistor 10.0 1/4 J 01R0902 Carbon Resistor 10.0 1/4 J 01

RA101 Resistor Array RGLE5V222J 01

RE602 Encoder REB161 PVB 15F DATA Dial 03

Z SW700 Push Switch SDDLB1 J,UC,CEE STANDBY/ON 03

VR603 Rotary Variable Resistor B10K EVJ05DF25B14 PITCH BEND 03

VR800 Rotary Variable Resistor A10.0K XV0141GPVN2 MASTER VOLUME 02

W-ENC Connector Assembly ENC 3P (V381800)

W-LCD Connector Assembly LCD 12P (V445890)

W-MVR Connector Assembly MVR 5P (V381830)

W-PIT Connector Assembly PIT 3P (V381810)

W-PND Connector Assembly PND 8P (V381880)

W-PNL Connector Assembly PNL 10P (V381890)W-PNS Connector Assembly PNS 11P (V381900)

W-STB Connector Assembly STB 6P (V381850)

Speaker 3.0cm TWEETER 2 02

Speaker 12.0cm 4 ohm 6W WOOFER 2 06

* LCD TTR

* Back-lit Assembly PT

Floppy Disk Drive 3.5inch DF354H 13

VC34 13 00

V3 62 12 00

VT 38 79 00

VT 38 79 00

VT 38 79 00

VT 38 79 00

VT 38 79 00

V I 100 100

V I 100 100

VR 69 99 00

VR 69 99 00

HF757910

--

HF754100

HF754100

V5 30 24 00

VU48 13 00

VY 98 04 00

VT 43 21 00

VZ 04 84 00

--

--

--

--

--

----

--

XV948A00

XT278A00

V7 12 67 00

V7 04 25 00

V6 49 23 00

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1

A B C D E F G H I J K L

PSR-550 OVERALL CIRCUIT DIAGRAM 2/2 (PN, AM, MKS5, MK-L, MK-H)

L

TWEETER

AMLCD BACK LIGHT

8/11/2019 PSR-550

50/50

2

3

4

5

6

7

8

R

L

R

WOOFER

TWEETER

to DM-CN550

to DM-CN150

to DM-CN650

to DM-CN180

to DM-CN920

to

DM-CN250

toDM-CN750

to

DM-CN960

PHONES/OUTPUT

to BATTERY

DC IN 10-12V

MIDI IN

MIDI OUT

TO HOST

PN 1/5

PN 2/5

PN 3/5

PN 4/5

PN 5/5

MK-H

MK-L

MKS5

to DM-CN170

FOOT

SWITCH

MASTER

VOLUME

STANDBY/ON

HOST SELECT

Data dial

PITCH BEND

LCD

to DM-CN999

not installed not installed

+

+

LCD DRIVER

LCD DRIVER

HPF

EQUALIZER

AMP

POWER AMP

PHOTO CAUPLER

HOST I/F

LINE TRANSCEIVE

INVERTER

REGULATOR

+6V

CPU

PN: 28CC1-8819394

AM: 28CC1-8813690

MK-H:28CC1-8812655

MK-L: 28CC1-8812655

REGULATOR +6VAN78L06 (XE924A00)

21

33:OUTPUT2:GND1:INPUT

REGULATOR +5VS81250SGY-Z(XT625A00)

21

33:OUTPUT2:INPUT1:GND

REGULATOR +3.3VPC29M33HF (XT333A00)

12

3 3:OUTPUT2:COMMON1:INPUT

: Mylar Capaci tor

: Ceramic Capacitor

: Semiconductive Ceramic Capacitor

Note : See parts list for details of circuit board component parts.

WARNING

Components having special characteristics are marked Zand must be replaced with parts having speci-

fication equal to those originally installed.

Documents

PSR-550