Printed Circuit Board - Yamaha DSP-E800 Service Manual

A B
DSP-E800
PRINTED CIRCUIT BOARD (Foil side)
1
–
SET MENU
2
STANDBY/
ON
2
3
2
TO : POWER
TRANSFORMER
4
5
32
6
C
OPERATION ( 1 ) P. C. B.
1
+
NEXT TAPE/MD EFFECT
MON
#702
W702
OPERATION ( 2 ) P. C. B.
FROM : INPUT (1)
D E
PROGRAM W
Q
INPUT
MODE
TO : MAIN (1) FROM : INPUT (1)
OPERATION ( 3 ) P. C. B.
+25
–25
+10
+5D
+5
–5
+12
–12
VG
+10
VG
VDN
VUP
–12
+12A
RRO
RLO
LPEO
CO
RO
E
E
E
LO
RRI
RLI
LFEI
CI
RI
E
E
E
LI
33
F G
Point q (Pin13 of IC701)
V : 2V/div
DC range
0V
Point w
INPUT CH1 : Emitter of Q706
SELECTOR
CH2 : Collector of Q705
V : 5V/div (CH1)
H : 5 sec/div
(This waveform is not available by pushing
the power switch ON and OFF.)
CH 1
CH 2
AC cord ON
Semiconductor Location
Ref. No. Location
D701 D3
D702 B3
D703 B3
D704 D3
D705 C2
C D706 D3
E
D707 D3
RR
D708 B3
E
RL
D709 B3
D710 B2
D711 B2
D712 B2
D801 B5
IC701 D2
IC702 B2
IC801 C5
IC802 C5
IC803 D5
IC804 B5
Q701 C2
Q702 C2
Q703 E3
Q704 E3
Q705 B3
Q706 B2
FROM : INPUT (1)
H
H : 0.1 µsec/div
1 : 1 probe
V : 5V/div (CH2)
DC range 1 : 1 probe
AC cord OFF