Symphonic WF803 - Troubleshooting Guide; Common Problems and Solutions

TU701
SIF
Audio Block Diagram ( DVC860D )
MOD-A
REC
AMP
7
6
AUTO
BIAS
99
P-ON+5V
P-ON+5V
Q421
BIAS
OSC
Q422
Q423 (PB=ON)
Q424
(PB=ON)
Q425
SWITCHING
D-REC OFF
4
EQ
AMP
LINE
AMP
MUTE
96
SP/LP-ON
P
R
ALC
(AUDIO PROCESS) 76
80
78
TUNER
REAR
FRONT
2
15
4 A-PB/REC
CL504
3 A-COM
1 AE-H
2 AE-H/FE-H
AUDIO
HEAD
AUDIO
ERASE
HEAD
AC HEAD ASSEMBLY
FE HEAD
(DECK ASSEMBLY)
1 AE-H/FE-H
2 FE-H-GND
CL501
1-10-5 1-10-6 H9400BLA
MAIN CBA
PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC
16
11 12
D-REC-H
D-REC-H REC/EE/PB
A-MUTE-H
D-PB-L
FROM
SERVO/SYSTEM
CONTROL BLOCK
DIAGRAM
FULL
ERASE
HEAD
IC301
SIF
MOD-A
A-IN (R)-F
A-IN (L)-F
A-IN (L)
A-IN (R)
A-OUT (R)
A-OUT (L)
N-A-OUT
N-A-IN
JK752
A-IN (R)
A-IN (L)
JK754
A-IN (L)-F
JK755
A-IN (R)-F
FROM/TO Hi-Fi AUDIO
BLOCK DIAGRAM
FROM DVD VIDEO/
AUDIO BLOCK
DIAGRAM
<DVD SECTION>
FRONT
REAR
IC751
(OUTPUT SELECT)
DVD-A(L)
DVD-A(R)
98
1 100
2
3
TP753
A-OUT (R)
TP754
A-OUT (L)
SW CTL
DVD
VCR
DVD
VCR
JK751
A-OUT (R)
A-OUT (L)
JK756
A-OUT (R)
A-OUT (L)
9 10 11
5
3
12
13
Q760
14
4
OUTPUT-SELECT
FROM SERVO/SYSTEM
CONTOL BLOCK
DIAGRAM
DVD AUDIO SIGNAL
WF10