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Yamaha 505 Service Manual Page 38

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ABCDEFGH
1
2
3
4
5
6
GX-505/GX-505VCD
■ PRINTED CIRCUIT BOARD (Foil side)
40 41
Point q (Pin59 of IC5)
V : 2V/div H : 50 nsec/div
DC range 1 : 1 probe
Point w (Pin39 of IC8)
V : 2V/div H : 0.1 µsec/div
DC range 1 : 1 probe
0V
0V
GX-505 CD P.C.B.
(Lead Type Device)
1
1
9
9
LMSW
LMSW
FMMTR (–)
FMMTR (+)
SPMTR (–)
SPMTR (+)
1/2VCC
E
A
C
LDGND
VR
FO (+)
TR (–)
VCC
D
B
F
LD
PD
TR (+)
FO (–)
12V
L
R
µ5.6V
/CS
DSI
VSEL
A GND
–12V
A GND
D GND
DSO
/CDRES
/DCLK
A GND
TX
GND
+5
GND
GND
+B
FROM : CD MECHA.
FROM : INPUT (1)
FROM : MAIN (1)
FROM : INPUT (3)
FROM : PICK UP HEAD
LED (CA)
POS SW
COLLE
OPEN SW
TUDN SW
LOADMTR (–)
TUUP SW
LED (AN)
ROTMTR (+)
ROTMTR (–)
CLOSE SW
GND
LOADMTR (+)
FROM : CD MECHA.
118
3619
1
30
80
51
31
50
100
81
120
60 41
21
40
80
61
118
3619
14
85
14
85
1
17
148
7
148
GX-505 CD P.C.B.
(Surface Mount Device)
1 2
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
IC7 B4
IC8 F3
IC9 F4
IC10 F4
IC13 G4
IC14 G4
● Semiconductor Location
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
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