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Troubleshooting
No Sound
Check following steps.
Is
the
audio
signal
observed at pins 10 and
21 of IC5001?
Yes
Is
the
audio
signal
observed at pins 5 and
8 of IC5031?
Yes
Audio signal processing circuit
AV
BOARD
L
PC
AUDIO-IN
R
L
AV
R
AUDIO-IN
L
AV
AUDIO-OUT
R
No
Check PC/AV-AUDIO switching circuit.
Check IC5001, audio-sw IC, and peripheral circuit. Check sig-
nals "P_SCLK2" and "P_SDA2" at pins 13,14 of IC5001.
Check Audio amplifier circuit.
No
Check IC5031, audio-amp IC, and peripheral circuit.
MUTE signal (Mute:L) is applied on pin 1 of IC5031, sent from
pin 12 of IC1804
Sound volume is controlled by IC301<SYSTEM CONTROL> via the IIC
bus.
Check 5V_AUDIO power supply line.
Check audio output circuit.
Check speaker, connection of the terminal "K8F".
IC5001
AUDIO-SW
<NJM1141>
4
29
1
31
30
23
27
25
Q5061
9
35
Q5063
22
37
Q5064
14
Q5062
IC301
SYSTEM
CONTROL
<PW168A>
DATA BUS
.
MAIN BOARD
IC5031
AMP.
Q5032
<LM4889M>
10
L
4
R
Q5033
21
Q5031
Mute: L
13
Mute: H
IC1804
OUTPUT
EXPANDER
<74LCX574>
-42-
SP901
+
+
5
1
3
-
8
1
Q5036
12
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