Yamaha DSP-AX620 Service Manual page 48

A B
DSP-AX620
PRINTED CIRCUIT BOARD (Foil side)
1
Point w (Pin 38 of IC501)
V : 2V/div, H : 0.1 µsec/div
DC, 1 : 1 probe
0V
Point e-A (/RES : Collector of Q510)
Point e-B (S12 : Emitter of Q511)
2
V : 5V/div (S12), V : 2V/div (/RES)
DC, 1 : 1 probe, H : 1 sec/div
S12
0V
0V
/RES
AC CORD ON AC CORD OFF
3
Semiconductor Location
Ref. No. Location Ref. No. Location
IC503 G3 Q501 E2
Q502 E2
Q503 E2
Q504 E2
Q505 E2
Q506 E2
Q507 F2
Q508 F2
Q509 F2
Q510 G2
Q511 G2
4
OPERATION ( 4 ) P. C. B.
W503
TO : OPE (1)
5
MG
ADKEY2
ADKEY1
+5M
MG
ADKEY2
+5M
EFFECT
W701
TO : OPE (4)
E-54/J-52
6
C
FROM : INPUT (1)
J, B, G only J only
VOLUME
W503
TO : OPE (4)
(Lead Type Device)
DSP SET MENU
PROGRAM
D E
OPERATION ( 1 ) P. C. B.
(Lead Type Device)
2
OPERATION ( 4 ) P. C. B.
E-55/J-53
F G
TO : OPE (9)
#505
W505
W501
TO : MAIN (1)
BL
(Surface Mount Device)
H
3 A
3 B