A
B
C
D
E
F
G
H
I
J
K
L
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
G
H
I
J
K
L
1
2
3
4
5
6
7
8
9
PSR-E303/YPT-300
PSR-E303/YPT-300
PSR-E303/YPT-300
PSR-E303/YPT-300
OVERALL CIRCUIT DIAGRAM
MIDI I/F
DRAM
4M
FLASH ROM 4M
MASK ROM 64M
PROGRAM/WAVE
SYSTEM
RESET
DAC
OP AMP
DECODER
REGULATOR
+3.3V
REGULATOR
+2.5V
28CC1-8834546 3
PHONES /
OUTPUT
IN
OUT
MIDI
SUSTAIN
DC IN 12V
BATTERY
OR
MASTER
VOLUME
(C4~C6)
(C1~B3)
SPEAKER R
SPEAKER L
to LCD BACK LIGHT
POWER SUPPLY
POWER SUPPLY
XX: Not installed
28CC1-8822437
28CC1-8822436
PN
MK
DAC/AMP
JACK
PN
BA33BC0FP (X5889A00)
REG3.3V
DMLCD: IC131
1: INPUT
2: GND
3: OUTPUT
1
2
3
RH5RZ25CA (X3679A00)
REG2.5V
DMLCD: IC132
1
3
2
1: GND
2: INPUT
3: OUTPUT
28CC1-8834552 2
XX
XX
XX
XX
XX
XX
XX
XX
XX
MIDI
DAC/AMP
P · B
LCD
CPU
MEMORY
REG5V
PNAM1/3: IC101
BA50BC0T (X5887A00)
1
2
3
3: OUTPUT
2: GND
1: INPUT
POWER AMP
REG5V
28CC1-8834546 3
28CC1-8834546 3
: Mylar Capacitor
: Ceramic Capacitor
: Semiconductive Ceramic Capacitor
: Metal Film Resistor
WARNING
Components having special characteristics are marked and must be replaced with parts having
specifications equel to those originally installed.
XX
XX
XX
XX
XX
XX
XX
: Flame Proof C.Resistor
xx
PN
: See parts list for details of circuit board component parts.
Note