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Yamaha 505 Service Manual Page 55

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ABCDEFGH
1
2
3
4
5
6
IJK
7
8
GX-505/GX-505VCD
■ SCHEMATIC DIAGRAM (GX-505/GX-505VCD MAIN)
* All voltage are measured with a 10M
Ω
/V DC electric volt meter.
* Components having special characteristics are marked
Z
and
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
IC201 : STK496-420Y
2 Channel AF Power Amp
15
11
912
17
18
19
20
13
14
1
3
10
R8
R2
R5
R51
R6
TR6
R4
C3
C2 C4
C1
TR3
TR5
TR4
TR2TR1
TR14 TR13
TR7
TR8
TR9
TR12
TR10
TR24
TR22
TR20
TR11
TR23
TR21
TR19
TR17
TR32
TR31
R18
R13
R32
COMPARATOR
COMPARATOR
R31
R17
R14
R12
TR15
SUB
R7
R9
R19
R3
D1
R15
R16
D6
D7
D31
D32
D35
D33
D34
TR16
2221
8
6
7
4
2
5
D36
16
SUB
POWER SUPPLY
POWER
SUPPLY
PROTECTION
POWER AMP
MUTING
REGULATOR
REGULATOR
0
-27.4
-12.6
-12.0
-23.6
-12.6
-26.9
-51.0
0
12.5
12.5
23.4
23.3
13.0
13.0
13.0
13.0
0
0
-0.1
-0.1
23.5
15.4
47.9
1.7
0
15.4
23.5
-46.6
51.0
0
0
0
0
0
0
-5.9
(0.7)
(0.7)
-5.9
-0.1
-0.1
-47.7
-23.2
-23.2
-23.2
-15.7
-23.7
-51.0
0
-15.7
-23.7
51.0
50.7
50.4
50.5
-0.8
0
0
0
0
0
0
0
0
0
12.4
12.3
4.9
4.9
11.7
0.6
0
0
0
0
0
-0.8
-23.6
-22.9
-23.7
51.0
-51.0
23.5
11.3
0
-23.7
AC10.4
AC13.5
AC37.8
AC79.5
AC6.1
13.4
13.4
0
0
0
0
0.7
CIRCUIT CHANGES BY MARKET.
O : USED X : NOT USED
68
P62 K-2
P63 K-2
P64 K-6
P65 K-6
P64 K-4
P65 K-4
P64 K-5
P65 K-5
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