Magnavox MWC20T6 - TROUBLESHOOTING GUIDE

1-10-3
Audio Block Diagram
T1202BLA
REC AMP
9
8
AUTO BIAS
11
P-ON+5V
P-ON+5V
Q1871
BIAS OSC
Q1872
Q1873 (PB=ON)
Q1874 (PB=ON)
Q1875
SWITCHING D-REC OFF
6
5
3
EQ AMP
SP/LP-ON
P
R
ALC
REAR TUNER
FRONT
IC1401 (AUDIO SIGNAL PROCESS)
76
3
AUDIO-PB/REC
CL1402
CN1301CN2 CN2503
4 AUDIO-COM 6 AE-H 5 AE-H/FE-H
AUDIO HEAD AUDIO ERASE HEAD
ACE HEAD ASSEMBLY
FE HEAD
(DECK ASSEMBLY)
1 FE-H 2 FE-H-GND
CL1403
MAIN CBA
SUB CBA
Mode : SP/REC
D-REC-H
TO DVD AUDIO BLOCK DIAGRAM <DVD SECTION> CN2A
FULL ERASE HEAD
7880
4
LINE AMP
LPF
MUTE
10
SERIAL I/F
55 54 53
YCA-CS
YCA-SDA
YCA-SCL
58
AUDIO-MUTE
JK1801 HEADPHONE JACK
SPEAKER R-CH
CL3802
CN1803
SP1801
FUNCTION CBA
SPEAKER L-CH
CN3801
SP801
SP(R)
1
SP-GND 2
SP(L)
1
SP-GND 2
CL3801
DVD-AUDIO-MUTE SP-MUTE
19 19
DVD-AUDIO(R)
18
3 418
DVD-AUDIO(L)
16
9 1
16
DVD-AUDIO-MUTE
JK2701
WF19
WF20
WF8
WF7
PB AUDIO SIGNAL
DVD AUDIO SIGNAL
REC AUDIO SIGNAL
DIGITAL AUDIO-OUT (COXIAL)
TO SYSTEM CONTROL/SERVO BLOCK DIAGRAM
TO SYSTEM CONTROL/SERVO BLOCK DIAGRAM
2
11
IC1803 (AUDIO AMP)
7
VOLUME
14
1
AMP AMP
MUTE /STANDBY CONTROL
3 6 8
DVD DVD VCR VCR
(L-CH) (R-CH)
212
DVD-H VOLUME
Q2701
BUFFER
Q2619
1,2 1,2
SP(R)
CN1802
JUNCTION-A CBA CN3802
1,3 1,3
SP(L)
CN2401
1,2 1,2
SP(L)
CN2801
JUNCTION-B CBA
IC1402 (OUTPUT SELECT)
SW CTL
9
10 11
12 13
14
1 2
15
3 5
4
JK1702
AUDIO(L)-IN
JK1703
AUDIO(R)-IN
EXT-L D-PB-L
TO SYSTEM CONTROL/SERVO BLOCK DIAGRAM
SIF
TO TV PROCESS BLOCK DIAGRAM
TP1702 TP1701
AUDIO-R
TP1703
A-OUT-YCA
AUDIO-L