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10. SCHEMATIC DIAGRAM
Note: When ordering service parts, be sure to refer to " EXPLODED VIEWS AND PARTS LIST" or
"ELECTRICAL PARTS LIST".
High Input Buffer / Gain Control
1
3
VR1:A
2
50KA
Low Input Buffer
6
4
5
SW3-1
INPUT SELECT
3
1
2
4
6
7
5 VR1:B
50KA
A-Lch(-)
A-Lch(+)
A-Rch(-)
A-Rch(+)
B-Lch(-)
B-Lch(+)
1
3
VR2:A
50KA
2
SW3-2
INPUT SELECT
4
6
VR2:B
5
50KA
A
100KC
AUTO LEVEL / MUTE
VR3:D
11
10
12
SW1-1
LPF/HPF
80Hz LPF
100KC
2
VR3:A
3
1
SW1-2
LPF/HPF
Invertor
SW2-1
LPF/HPF
SW4-1
BASS BOOST
SW2-2
LPF/HPF
8
7
5
SW4-2
6
BASS BOOST
First Step
Differential Absorption
Second Step
Q138 Bias
Differential Absorption
Drive Power Amplification
2SC4467
Q141
C4373
Q139
Over Current Detection
Q142
Q140
2SA1694
A1661
2SC4467
Q241
C4373
Q239
Q242
Q240
2SA1694
A1661
2SC4467
Q341
C4373
Q339
Q342
Q340
2SA1694
A1661
2SC4467
Q441
C4373
Q439
Q442
Q440
2SA1694
A1661
(NO MOUNT)
A
P.C.B TOTAL ASSY
DC Rectification
5
6
7
8
8
A-Lch-
7
A-Lch+
T1
6
B-Lch-
5
B-Lch+
4
3
2
1
4
A-Rch+
3
A-Rch-
2
B-Rch+
1
B-Rch-
SP
STP60NF06FP
STP60NF06FP
Q11
Q12
3
2
1
STP60NF06FP
STP60NF06FP
Q9
Q10
Protection LED
The > mark found on some component parts indicates
the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of
identical designation.
POWER
1
POWER
2
GND
3
SYSTEM
CONTROL
A
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