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1.3 No Sound
Check following steps.
Part 4: Troubleshooting
4-6
Check IC5001, audio-sw IC, and peripheral circuit.
Check IC5001, audio-sw IC, and peripheral circuit.
AUD_PC/AV_SW (PC:H) signal is applied on pin 10 of IC5001
through Q5003, sent from pin 12 of IC3551.
Is the audio signal
observed at pins 3 and
13 of IC5001?
Yes
No
Check Audio amp.and control circuit.
Check IC5003, audio-amp IC, and peripheral circuit.
MUTE signal (Mute:L) is applied on pin 4 of IC5003, sent from
pin 12 of IC1801.
VOLUME signal is applied on pin 2 of IC5002., sent from pin
13 of IC3551.
Check 5V_AUD power supply line.
Is the audio signal
observed at pins 5 and
8 of IC5003?
Yes
No
Check audio output circuit.
Check speaker, connection of the terminal “K8F”.
Q5002
Q5006
Q5003
Q5001
Q5004
12
10
2
1
14
1
5
3
3
8
12
13
12
5
13
Mute: H
Mute: L
K8F
K50B
K10E
P_SCLK2
P_SCDA2
AUD_PC/AV_SW
V
OLUME
MAIN BOARD
AV
BOARD
IC5003
AMP.
<LM4865M>
IC5002
VOLUME
<BA7655A>
L
R
L
R
L
R
PC
AUDIO-IN
AV
AUDIO-IN
SP901
IC1801
OUTPUT
EXPANDER
<74LCX574>
IC3551
D/A
CONVERTER
<M62393>
IC301
SYSTEM
CONTROL
<PW168A>
PC
AV
AUD_PC/AV_SW at IC3551
H
L
AUD_PC/AV_SW at IC5001
L
H
AUDIO-SW Switching Logic
MUTE
IC5001
AUDIO-SW
<4052>
+
2
+
4
8
9
10
11
1
3
+
-
DATA BUS
Fig. 4-3 Audio signal processing circuit
Содержание LV-S3E/D78-5423
Страница 2: ...CANON Multimedia Projector LV S3U D78 5422 LV S3E D78 5423 SERVICE SMANUAL ...
Страница 9: ...Part 1 General Information ...
Страница 24: ...Part 2 Repair Information ...
Страница 42: ...Part 3 Adjustment ...
Страница 59: ...Part 4 Troubleshooting ...
Страница 73: ...Part 4 Troubleshooting 4 14 BA7078AF Sync Detector IC5301 BA9743AFV DC DC Converter IC371 ...
Страница 74: ...Part 4 Troubleshooting 4 15 LM4865 Audio Amplifier IC5003 PW168A Scaler Main CPU IC301 ...
Страница 75: ...Part 4 Troubleshooting 4 16 TA1370FG Sync Separator Frequency Counter IC5302 VPC3230D Video Decoder IC101 ...
Страница 76: ...Part 5 Parts Catalog ...
Страница 77: ......
Страница 93: ...Part 6 Electrical Diagrams ...