Yamaha GX-505 Service Manual page 37

A B
PRINTED CIRCUIT BOARD (Foil side)
1
TUNER P.C.B.
(Lead Type Device)
2
3
4
AM GND FM
5
6
C D
(Surface Mount Device)
TUL
E
TUR
12V
TUMUTE
TUCE
TUDATA
TUCLK
TUDO
STAD
STEIN
Semiconductor Location
Ref. No. Location
D1 D2
D2 D2
D3 D2
D4 D2
D5 E3
D6 D2
D7 D2
D8 D2
D9 D2
D10 D2
D11 E4
38
E
TUNER P.C.B.
u
y
Ref. No. Location Ref. No. Location
IC1 A3 Q1 B4
IC2 E3 Q2 B4
IC3 D2 Q3 B3
IC4 E2 Q4 B2
F G
GX-505/GX-505VCD
CIRCUIT CHANGES BY MARKET.
U, C, R, T, L, A B, G J
X3 X X O
X4 X O X
IC3 X X O
IC4 X O X
Q4 X X O
D6 ~ 8, 10 X X O
L7 ~ 9 X O X
C68, 71 ~ 74 X O X
C46, 52 ~ 54 X X O
C29 O O X
C42 ~ 51, 55, 56 X X O
C67, 69, 70 X O X
R33 ~ 38 X X O
R54 X O X
R25 O O X
R39 X X O
J21 X O X
J1, 40, 44 X X O
O : USED
X : NOT USED
Point y (Pin20 of IC2)
H : 0.1 µsec/div
V : 2V/div
DC range 1 : 1 probe
0V
Point u (Pin12 of IC4)
H : 0.1 µsec/div
V : 2V/div
DC range 1 : 1 probe
0V
H
39