Yamaha DSP-E800 - Printed Circuit Board

ABCDEFGH
1
2
3
4
5
6
DSP-E800
■ PRINTED CIRCUIT BOARD (Foil side)
32 33
Point q (Pin13 of IC701)
V : 2V/div H : 0.1 µsec/div
DC range 1 : 1 probe
0V
Point w
CH1 : Emitter of Q706
CH2 : Collector of Q705
V : 5V/div (CH1) V : 5V/div (CH2)
H : 5 sec/div DC range 1 : 1 probe
(This waveform is not available by pushing
the power switch ON and OFF.)
CH 1
CH 2
AC cord ON
AC cord OFF
EXT
/ICD
DBL
TXAC
INTD
SCKD
MG MG
SCK
CEAC1
/CSD
VDN
DTB
CELC
PRV2
ERRA CEAC2 RXAC CLKAC SOD SID MG +5M SDT FMT CECOD VUP CKB CETC
FROM : INPUT (1)
TO : POWER
TRANSFORMER
OPERATION ( 1 ) P. C. B.
TAPE/MD
MON
EFFECT
Q PROGRAM
W
INPUT
MODE
INPUT
SELECTOR
STANDBY/
ON
–
SET MENU NEXT
+
1
30
3150
51
80
81 100
MG MG PRD S12 PRY ERY PRI VP PRV1
TO : MAIN (1)
#702
W702
W752 GY W751 GY
2
2
1
OPERATION ( 2 ) P. C. B.
FROM : INPUT (1)
+10
VDN
–12
RRO
LPEO
RO
E
LO
RLI
CI
E
E
VG
VUP
+12A
RLO
CO
E
E
RRI
LFEI
RI
E
LI
VOLUME
14
5
8
1
4
5
8
1
4
5
8
1
10
C
RR
RL
+5
+10
–25
+25
E E +5D –5 +12 –12 VG
FROM : INPUT (1)
+25
–25
+10
+5D
+5
–5
+12
–12
VG
FROM : MAIN (4)
C
E
RR
E
RL
FROM : MAIN (1)
OPERATION ( 3 ) P. C. B.
Ref. No. Location
D701 D3
D702 B3
D703 B3
D704 D3
D705 C2
D706 D3
D707 D3
D708 B3
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
● Semiconductor Location