Printed Circuit Board - Yamaha GX-505 Service Manual

A B
PRINTED CIRCUIT BOARD (Foil side)
1
GX-505VCD VCD P.C.B.
(Lead Type Device)
2
LED (CA)
LED (AN)
POS SW
ROTMTR (+)
COLLE
ROTMTR (–)
OPEN SW
CLOSE SW
TUDN SW
GND
LOADMTR (–)
LOADMTR (+)
TUUP SW
3
1/2VCC
VCC
E
D
A
B
C
F
LDGND
LD
VR
PD
FO (+)
TR (+)
TR (–)
FO (–)
4
5
FROM : INPUT (2)
6
C
FROM : CD MECHA.
CLDCK
HSEL
CDLACK
CDSCK
HCK
SBCK
DIDATA
HARDY
EMPH
DGND
D+3.3V
R+5V
VGND
COUT
A+3.3V
FROM : INPUT (1)
FROM : MAIN (1)
D E
GX-505VCD VCD P.C.B.
(Surface Mount Device)
1 2
BLKCK
SUBC
IPFLG
CDDATA
HDIO
VRST
HINT
DISCK
DILRCK
XCK
DGND
D+3.3V
VGND
YOUT
CVOUT
Point q (Pin59 of IC5)
V : 2V/div H : 50 nsec/div
DC range 1 : 1 probe
0V
42
F G
Point w (Pin39 of IC8)
H : 0.1 µsec/div
V : 2V/div
DC range 1 : 1 probe
0V
H
GX-505/GX-505VCD
Semiconductor Location
Ref. No. Location
D1 F2
D2 E2
D4 E4
D5 E4
D6 E4
D7 E4
Ref. No. Location
IC1 F2
IC2 B3
IC3 B3
IC4 E4
IC5 F3
IC6 B4
IC7 B4
IC8 F3
IC9 F4
IC10 F4
IC11 F3
IC12 F3
IC13 G4
IC14 G4
Ref. No. Location
Q1 C1
Q2 B3
Q3 C1
Q4 B3
Q5 C4
Q6 B4
Q7 B4
Q8 B5
Q9 B4
Q10 B5
Q11 C5
Q12 C5
Q13 C4
43