Yamaha Portatone PSR-VN300 Service Manual page 38

A B
PSR-VN300 OVERALL CIRCUIT DIAGRAM
1
LCD DRVER
2
3
LCD
SYSTEM
RESET
4
5
XX
DMLCD
6
7
8
PSR-VN300
9
A B
C D E
CPU
SWL01
XX
XX
OP AMP
DAC
P · B
DAC/AMP
XX
C D E
F G
MASK ROM 64M
FLASH ROM 4M
PROGRAM/WAVE
MR27T6402L
MEMORY
XX
DRAM
4M
PN
GLT440L16-40TC
MIDI
REGULATOR
+3.3V
REGULATOR
+2.5V
OR
POWER SUPPLY
DECODER
MK
28CC1-8834552 2
: Ceramic Capacitor
: Mylar Capacitor
61H
: Semiconductive Ceramic Capacitor
: Metal Film Resistor
(C4~C6)
: Flame Proof C.Resistor
XX : Not installed
Note: See parts list for details of circuit board component parts.
28CC1-8822437
61L
(C1~B3)
28CC1-8822436
F G
H I J
PN
PORTABLE GRAND
XX
JACK
MIDI I/F
PNAM 2/3
28CC1-8834546 4
(REW)
(A-B REPEAT)
(PAUSE) (FF)
LESSON
LESSON
LISTEN&LEARN
PN
REGULATOR +5V
POWER AMP
XX
xx
MASTER
VOLUME
PNAM 3/3
28CC1-8834546 4
WARNING
Components having special characteristics are marked and must be replaced with parts having
specifications equel to those originally installed.
H I J
K L
PSR-VN300
1
XX
BA33BC0FP (X5889A00)
REGULATOR +3.3V
2
DMLCD: IC131
2
1
3 1: INPUT
2: GND
3: OUTPUT
RH5RZ25CA (X3679A00)
REGULATOR +2.5V
DMLCD: IC132
SPEAKER R
3
1
2
IN
3
1: GND
2: INPUT
3: OUTPUT
MIDI
BA50BC0T (X5887A00)
REGULATOR +5V
OUT
PNAM1/3: IC101
SUSTAIN
4
1: INPUT
1
2 2: GND
3
3: OUTPUT
PNAM 1/3
5
POWER
SUPPLY
to LCD BACK LIGHT
XX
BATTERY
XX
6
DC IN 12V
XX
PHONES /
OUTPUT
XX
7
SPEAKER L
DAC/AMP
28CC1-8834546 4
8
PSR-VN300
9
K L