Printed Circuit Board - Yamaha CRX-E400 Service Manual

A B
RX-E400
PRINTED CIRCUIT BOARD (Foil side)
1
2
3
4
5
14
6
C
OPERATION P. C. B.
AUTO/
PRESET/TUNING PRESET/BAND MAN'L
INPUT
TREBLE
BALANCE
#2
W706
MAIN (3)
OPERATION P. C. B.
(Surface Mount Device View)
D E
(Lead Type Device View)
#3
MAIN (1)
W705
STANDBY/ON
TIMER
MEMORY DISPLAY
PHONES
BASS
2 1
F G
Semiconductor Location
Ref. No. Location Ref. No. Location
D701 D5 IC700 D5
D702 D5
D703 D5
D705 E4
D706 E5
D707 E5
D708 E5
D709 E5
D710 E5
D711 E5
3
H
Ref. No. Location
Q700 E2
Q701 E5
Q702 E2
Q703 E5
Point q (Pin 11 of IC700)
V : 2V/div, H : 10µsec/div
DC, 1 : 1 probe
0V
Point w (Pin 13 of IC700)
V : 2V/div, H : 50nsec/div
DC, 1 : 1 probe
0V
Point e
CH 1 : Collector of Q701
CH 2 : Collector of Q702
V : 2V/div (CH 1)
V : 5V/div (CH 2)
DC, 1 : 1 probe, H : 0.5sec/div
CH 1
0V
CH 2
0V
AC CORD : ON AC CORD : OFF