Yamaha PSR-140 Service Manual download pdf (Page 39)

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3

2

1

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2

ABCDEFGHI

JKL

ABCDEFGHI

JKL

PSR-280/PSR282

PSR-280/PSR-282 OVERALL CIRCUIT DIAGRAM 1/2

(

DM, AM, PN

(

VR, PW

)

)

PSR-280/PSR282PSR-280/PSR282

to MKS3-CN1

DM

AM 1/2

AM 2/2

PN

(

VR

)

MASTER

VOLUME

to PN

(

PNR

)

-CN701to LCD-CN1

SUSTAIN

IN

MIDI

OUT

EPROM 8M PROGRAM

ROM 32M PROGRAM/WAVE

SRAM 1M

SRAM 1M

SWX00B

REGULATOR +3.3V

RESET

PHOTO COUPLER

DAC

OP AMP

OP AMP

OP AMP

OP AMP

OP AMP

OP AMP OP AMP

POWER AMP 17W

REGULATOR +5V

REGULATOR +5V

REGULATOR +5V

to BATTERY

PHONES/OUTPUT

to SPEAKER-R

to SPEAKER-L

to LCD

DC IN 10-12V

PQ05RA1(XL450A00)

REGULATOR +5V

2: OUT

1: IN

3: GND

4: ON/OFcont.

4

3

2

1

REGULATOR +5V

S-81250SGY-Z

(

XT625A00

)

2

1

3

3: OUTPUT

2: INPUT

1: GND

REGULATOR +3.3V

µ

PC29M33HF

(

XT333A00

)

1

2

3

3: OUTPUT

2: COMMON

1: INPUT

20E1-FC4

(

VL723600

)

DIODE

1

2

1: ANODE

2: CATHODE

: Mylar Capacitor

: Ceramic Capacitor

: Semiconductive Cera Cap

: Metal Oxide Film Resistor

See parts list for details of circuit board

component parts.

Note :

PN

(

PW

)

STAND-BY ON

28CC1-8816889

28CC1-8816890

28CC1-8816892

28CC1-8816892

28CC1-8816890

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