Sanyo PLC-SU20E

-40-
Troubleshooting
CG/AV
SUDIO
SW
IC5001
AV BOARD AV SUB BOARD
MAIN COMP.-A BOARD MAIN COMP.-B BOARD
MAIN COMP.-C BOARD
POWER BOARD
Q5007
SP901
SPEAKER
L
R
15
4
23
39
3
2
4
4
3
195
279
2
4
18
16
8
2
10,11
1
13
2
12
14
Q5008
AUDIO
AV/CG-SW
AV/CG-SW
Q1901
AUDIO
OUTPUT
IC001
SYSTEM
CONTROL
&
SCAN CONV.
IC301
SUB CPU
IC1901
AUDIO IN
CG L
CG R
AV L
AV R
DAC
IC431
I/O
EXPANDER
IC1904
SCLK
PORTB0
PORTB1
VOL
AUDIO
MUTE
SDAT
M_SCL M_SDA
BUFFER
IC809
1. Check that sound volume control signal is correct.
Pin 4 of IC001
2. Check that audio signal is observed at pin 2 of
IC001.
3. Check the MUTE signal at pin 3 of IC001.
Pin 3 of IC001 ......................................MUTE On: H
4. Check that Vcc-voltage(+12V) is applied at pins 1
and 9 of IC001.
POWER BOARD
1. Check that the Vcc-voltage(+9V) is applied at pins 3-
6 of K3802.
2. Check that the AV/CG switching signal is correct.
Pin 9, 10 of IC5001 ........................................ AV : L
CG : H
3. Check that audio signal is observed at following
points.
Pins 9-10 of K3802, pins 11-14 of K3801
1. Check that the AV/CG switching signal is correct.
Pin 4 of IC1904 .............................................. AV : L
CG : H
2. Check that the MUTE signal is correct.
Pin 39 of IC1901 ..................................MUTE On: H
1. Check that sound volume control signal is correct.
Pin 4 of IC431
MAIN COMP-C BOARD
MAIN COMP-B BOARD
AV, AV SUB BOARD
NO SOUND