No Sound; Troubleshooting - Sanyo PLC-EF10EA Service Manual

Troubleshooting

NO SOUND

AV JACK BOARD
1. Check that the Vcc-voltage(Pin16 of IC5001 +9V) is
correct.
2. Check that the AV1/AV2 SELECT signal is correct.
Pin9, 10 of IC5001....................................... AV1 : H
3. Check the input and output signals at IC5001.
Check the input and output signals at Q5061,
Q5042.
MOTHER BOARD
1. Check that the Vcc-voltage( +9V,+16V) is correct.
2. Check the input and output signals at Q001.Q003.
3. Check that the POWER FAIL signal is correct.
4. Check that the AUDIO MUTE signal is correct.
5. Check that the SPEAKER-OFF signal is correct.
6. Check the input and output signals at IC001.
AV JACK BOARD
7
R:5 9 10
L:2
4
SWITCH
IC5001
15
R:3
L:1
AV1 AUDIO INPUT
AV2 AUDIO INPUT
AV2 : L
R
Q5061
BUFFER
Q5042
L
10
SPEAKER
R
SPEAKER
L
MOTHER BOARD
INTERFACE BOARD
1. Check that the Vcc-voltage( +9V) is correct.
2. Check that the AV/CG1/CG2 SELECT signal is cor-
rect.
Pin9, 10 of IC5101 ................................ Pin9 : Pin10
3. Check the input and output signals at IC5101.
4. Check the input and output signals at IC5121.
5. Check the signal at Pin9 of IC5121. (SDA)
Check the signal at Pin10 of IC5121. (SCL)
6. Check the input and output signals at Q5142.Q5143.
CG1 AUDIO INPUT
CG2 AUDIO INPUT
16V
POWER FAIL
R
2
AUDIO Q001
AMP BUFFER
IC001 Q003
7
5
3
L
AUDIO MUTE
SPEAKER OFF
-45-
AV L : L
AV H : L
CG2 L : H
CG1 H : H
9 10
R:11 L:4
R:15 L:2
SWITCH
14
IC5101
1
R
L
13 3
19 2
9
AUDIO
SDA
CONTROL
10
IC5121
SCL
14 7
R
Q5142
BUFFER
Q5143
L
INTERFACE BOARD