Yamaha PortaTone PSR-A300 Manuale di servizio - Pagina 40
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A
B
PSR-A300
OVERALL CIRCUIT DIAGRAM
1
LCD DRVER
2
CPU
3
LCD
SYSTEM
RESET
4
XX
XX
5
XX
DMLCD
XX
6
7
8
PSR-A300
9
A
B
C
D
E
MASK ROM 64M
PROGRAM/WAVE
XX
SWL01
XX
OP AMP
ADC
DAC
P · B
DAC/AMP
61H
(C4~C6)
28CC1-8822437
C
D
E
F
G
FLASH ROM 4M
MEMORY
DRAM
4M
PN
MIDI
REGULATOR
+3.3V
REGULATOR
+2.5V
OR
POWER SUPPLY
DECODER
MK
28CC1-8834552 2
PB
PITCH BEND
28CC1-8830820
61L
(C1~B3)
28CC1-8822436
F
G
H
I
PN1
PN
28CC1-2000001121
JACK
SPEAKER R
IN
MIDI I/F
MIDI
OUT
SUSTAIN
PNAM
2/3
28CC1-8834546 3
PNAM
1/3
PN
POWER SUPPLY
STANDBY/ON
XX
REGULATOR +5V
XX
XX
POWER AMP
XX
XX
xx
MASTER
DAC/AMP
VOLUME
PNAM
3/3
28CC1-8834546 3
28CC1-8834546 3
: Ceramic Capacitor
: Semiconductive Ceramic Capacitor
: Mylar Capacitor
: Metal Film Resistor
: Flame Proof C.Resistor
XX: Not installed
: See parts list for details of circuit board component parts.
Note
WARNING
Components having special characteristics are marked
specifications equel to those originally installed.
H
I
J
K
L
PSR-A300
PN2
28CC1-2000001121
BA33BC0FP (X5889A00)
REGULATOR +3.3V
DMLCD: IC131
2
1
3
1: INPUT
2: GND
to LCD BACK LIGHT
3: OUTPUT
RH5RZ25CA (X3679A00)
REGULATOR +2.5V
DMLCD: IC132
BATTERY
1
2
DC IN 12V
3
1: GND
2: INPUT
3: OUTPUT
BA50BC0T (X5887A00)
REGULATOR +5V
PNAM1/3: IC101
PHONES /
OUTPUT
1: INPUT
1
2
2: GND
3
3: OUTPUT
SPEAKER L
IMH10A T110 (WB107300)
TRANSISTOR ARRAY
PN1: TR201-203
PN2: TR301
4
5
6
3
2
1
4
5
6
1: DTr1 OUT
2.2kΩ
2: DTr2 IN
3: DTr2 GND
47kΩ
4: DTr2 OUT
DTr1
5: DTr1 IN
DTr2
6: DTr1 GND
47kΩ
2.2kΩ
3
2
1
and must be replaced with parts having
PSR-A300
J
K
L
1
2
3
4
5
6
7
8
9