Yamaha Portatone YPT-300 Service Manual - Page 35
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A
B
OVERALL CIRCUIT DIAGRAM
PSR-E303/YPT-300
1
LCD DRVER
2
3
LCD
SYSTEM
RESET
4
5
XX
DMLCD
XX
6
7
8
PSR-E303/YPT-300
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
MEMORY
XX
DRAM
4M
PN
MIDI
REGULATOR
+3.3V
REGULATOR
+2.5V
OR
POWER SUPPLY
DECODER
MK
28CC1-8834552 2
61H
(C4~C6)
28CC1-8822437
61L
(C1~B3)
28CC1-8822436
F
G
H
I
J
PN
XX
JACK
MIDI I/F
PNAM
2/3
28CC1-8834546 3
PN
POWER SUPPLY
REGULATOR +5V
POWER AMP
XX
xx
MASTER
VOLUME
PNAM
3/3
28CC1-8834546 3
: Semiconductive Ceramic Capacitor
: Ceramic Capacitor
: Mylar Capacitor
: Metal Film Resistor
: Flame Proof C.Resistor
XX: Not installed
Note
: See parts list for details of circuit board component parts.
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-E303/YPT-300
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
to LCD BACK LIGHT
XX
BATTERY
XX
6
DC IN 12V
XX
PHONES /
OUTPUT
XX
7
SPEAKER L
DAC/AMP
28CC1-8834546 3
8
PSR-E303/YPT-300
9
K
L