Yamaha GX-700 Service Manual page 60

A B
GX-700/GX-700VCD
SCHEMATIC DIAGRAM (GX-700/GX-700VCD MAIN)
1
0
-12.7
-27.9
-51.8
-27.3 -27.3
-12.1
2
REGULATOR
P66 L-2
P67 K-2
12.5
12.6 23.4
13.0
13.0
13.0
13.0
3
0
0
P68 K-5
P69 K-5
P68 K-4
4
P69 K-4
MUTING
0
0.6
5
0
0
0.6
0
6
0
0.6
7
0
8
73
C D E
0
REGULATOR
-12.7
-23.9
23.1
POWER AMP
23.5
51.8
51.6
15.5
-0.5 0
-0.1
0
-0.1
0
0
0
51.6
0
0
0
-0.1
51.6
0
0
-0.1 0
-16.0
-24.1
-0.1
0
0
0
-0.1 0
51.5
0
IC201 : STK496-620Y 17 22 21 15 11
TR13
3 Channel AF Power Amp
TR15
R12 TR17 R13
C3
TR16
TR14
D3
R15 R16
R17
D2 R14 TR18
TR1 TR2 R4 TR20
R18
TR19
TR22
TR6
TR21 R19 TR22
TR9
TR23 TR24
C2
TR11
R2 C1
R5
18 R9
TR35 TR36
TR3 TR4 TR12
TR8 TR33 R29 TR34
19
R6
TR31 R25
TR32
R24
20 TR10 TR30
R25 R26
TR5 TR7 R27
D4
R7
D1 TR26
R3 R8
C5 TR28
R23
R22 TR29
TR27
TR25
R32
12 13 16 10 14 24 23 26 25
F G
51.8
-52.0
POWER
PROTECTION SUPPLY
4.9
12.5
23.5
11.8
0
-24.1
4.9
12.4
0
0 0
0.6
0
11.6 0
-0.9
-24.1 -24.1
-23.4
-23.4
-24.2 -24.2
3
1
R40
TR42
COMPARATOR
5
D40 D41 D42
D43
4
2
SUB
7
D53
D50 D51 D52
6
TR52
COMPARATOR
R50
8
9
H I
AC10.6
AC6.2
AC38.2
AC80.8
SUB
POWER SUPPLY
12.4
30.2
12.4
30.2
12.9
0
0.7
12.9
0
0
P68 K-5
0
P69 K-5
-0.1
0.1
-24.0
0.9
-24.0
FAN DRIVE
P72 D-4
J K L
AC28.7
* 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.