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A
B
PSR-280/PSR-282 OVERALL CIRCUIT DIAGRAM 1/2 ( DM, AM, PN ( VR, PW ) )
1
2
DM
3
4
5
PHOTO COUPLER
6
7
8
9
10
11
12
AM
2/2
13
14
28CC1-8816892
: Mylar Capacitor
: Ceramic Capacitor
15
: Semiconductive Cera Cap
: Metal Oxide Film Resistor
S-81250SGY-Z (XT625A00)
PQ05RA1(XL450A00)
REGULATOR +5V
REGULATOR +5V
1: IN
16
2: OUT
1
2
3
3: GND
4
4: ON/OFcont.
17
PSR-280/PSR282
A
B
C
D
E
EPROM 8M PROGRAM
ROM 32M PROGRAM/WAVE
SRAM 1M
to LCD-CN1
to PN(PNR)-CN701
PN ( VR )
AM
1/2
MASTER
VOLUME
28CC1-8816890
SUSTAIN
IN
MIDI
OUT
µPC29M33HF (XT333A00)
20E1-FC4 (VL723600)
REGULATOR +3.3V
DIODE
1
2
1: GND
1
1: INPUT
2
1
3
2: INPUT
1: ANODE
2
2: COMMON
3: OUTPUT
3
2: CATHODE
3: OUTPUT
C
D
E
F
G
SRAM 1M
OP AMP
OP AMP
OP AMP
OP AMP
REGULATOR +5V
REGULATOR +5V
REGULATOR +5V
Note :
See parts list for details of circuit board
component parts.
F
G
H
I
J
SWX00B
DAC
OP AMP
POWER AMP 17W
OP AMP
PN ( PW )
H
I
J
K
L
PSR-280/PSR282
1
2
3
REGULATOR +3.3V
RESET
4
to MKS3-CN1
5
6
28CC1-8816889
7
8
OP AMP
9
to SPEAKER-L
to SPEAKER-R
10
PHONES/OUTPUT
11
12
to BATTERY
DC IN 10-12V
13
to LCD
14
28CC1-8816892
STAND-BY ON
15
28CC1-8816890
16
17
PSR-280/PSR282
K
L
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