Canon LV-7105 Service Manual - Page 84

No Sound, Main board, Audio board

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Part 4: Troubleshooting 1.2 No Sound 1) Main board 1. Check that the PC/AV switching signal is correct. Pins 10 and 11 of IC5001 AV : L, PC : H 2. Check that audio signal is observed at following points. Pins 11-12(PC)/13-14(AV) of K10B/K50B 3. Check that the MUTE signal is correct. Pin 5 of K5A Mute-On: H 4. Check that the MUTE signal is correct. Pin 12 of IC1803 Mute-On: L 5. Check that the PC/AV switching signal is correct. Pin 16 of IC1804 AV : L, PC : H 2) Audio board 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. AUDIO AUDIO IN OUT AV BOARD PC L PC R AV L AV R R L Q5041 Q5042 10,11 1 PC/AV 15 13 AUDIO SW 2 IC5001 14 12 Q5001 Q5007 L R Q5008 Q5003 Q5004 PC/AV-SW MAIN BOARD Q5002 16 I/O EXPAND. IC1804 SP901 SPEAKER 8 2 AUDIO AUDIO OUTPUT 3 MUTE IC001 4 VOL AUDIO BOARD MUTE Q1801 12 I/O EXPAND. IC1803 1 DAC 16 4 DAC 16 4 DAC IC431 3 2 SDATA 14 BUFFER IC851 SCLK 12 6 8 I/O SDATA13 EXPAND. SCLK 12 IC1806 SYSTEM BUS CONTROL & SCAN CONV. IC301 Fig. 4-2 4-6

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1.2 No Sound
1) Main board
1.
Check that the PC/AV switching signal is correct.
Pins 10 and 11 of IC5001
...................
AV : L, PC : H
2.
Check that audio signal is observed at following points.
Pins 11-12(PC)/13-14(AV) of K10B/K50B
3.
Check that the MUTE signal is correct.
Pin 5 of K5A
.......................................
Mute-On: H
4.
Check that the MUTE signal is correct.
Pin 12 of IC1803
................................
Mute-On: L
5.
Check that the PC/AV switching signal is correct.
Pin 16 of IC1804
................................
AV : L, PC : H
2) Audio board
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.
Part 4: Troubleshooting
4-6
Fig. 4-2
PC/AV
AUDIO
SW
IC5001
AV BOARD
AUDIO BOARD
MAIN BOARD
Q5007
SP901
SPEAKER
L
R
15
3
2
4
16
12
16
13
12
16
14
4
12
4
6
8
1
3
2
8
10,11
1
13
2
12
14
Q5008
PC/AV-SW
Q1801
AUDIO
OUTPUT
IC001
BUFFER
IC851
DAC
IC431
I/O
EXPAND
.
IC1804
I/O
EXPAND
.
IC1803
I/O
EXPAND
.
IC1806
SYSTEM
CONTROL
&
SCAN CONV.
IC301
AUDIO IN
AUDIO
OUT
PC L
PC R
AV L
AV R
L
R
VOL
AUDIO
DAC
SDATA
SCLK
DAC
SDATA
SCLK
MUTE
MUTE
Q5041
Q5001
Q5003
Q5002
Q5004
Q5042
BUS