-39-
Troubleshooting
IC1652
AUDIO
CONTROL
IC1651
PRE.AMP
IC1632
R-AMP.
IC1631
L-AMP.
IC5011
AUDIO-SW
5
14
1
13
2
12
9
10
3
13
PC_L/R
PC_L/R
AV_L/R
Q5008
Q5007
VOLUME
SCL/SDA
A_MUTE
A_SW1
A_SW2
AU_SW2
L
AU_SW1
R
L
R
L
R
5
55
14
17
14
17
7
10
15
1
7
2
6
2
IC1801
I/O
EXPANDER
5
4
IC212
D/A
15
3
2
49
IC801
MAIN
CPU
COMPUTER2
AUDIO IN
COMPUTER1
AUDIO IN
VIDEO
AUDIO IN
3
7
8
1
3
4
1
2
K10T
K16S
K16R
K8T
41
42
39
40
K10Q
K8B
K16U
AV BOARD
M DRIVE BOARD
MAIN BOARD
MUTE On: H
12
3,14
SPEAKERS
29, 30
No Sound
1. No audio signals at AV input circuit.
Check audio signals at pins 1, 13 (CG1), 5, 14 (CG2) and
2, 12 (VIDEO) of IC5011 on AV Board. Check IC5011 and
peripheral circuits.
2. Incorrect operation of Input mode switching.
Check AUDIO_SW1/AUDIO_SW2 switching signals at pins
9 and 10 of IC5011. The AUDIO_SW1/AUDIO_SW2 sig-
nals are output from pins 4 and 5 of IC1801. See the truth
table below for input mode selection.
3. No audio output signal at speakers.
Check audio signals at pins 3, 4 and 1, 2 of K16U on M
Drive Board.
Check MUTE signal at pin 8 of K16R/K8T.
The MUTE signal is output from pin 48 of IC1801.
Mute On : High
Check MUTE signal at pins 3 and 14 of IC1652.
Check sound volume signal at pin 7 of K16R/K8T.
The VOLUME signal is output from pin 15 of IC212 and it
is controlled by IC801 via the IIC bus.
Volume Min.: Low
Check audio signals at IC1651,IC1631, IC1632 and periph-
eral circuits.
4. No power supply at audio circuit.
Check 6V(6V AUDIO) power supply line.
Logic Table of IC5011
Pin 10
Pin 9
Mode
L
L
COMPUTER 1
H
L
COMPUTER 2
L
H
VIDEO
Summary of Contents for PLC-XP40
Page 50: ... 50 CXA2101AQ RGB Matrix IC4101 IC Block Diagrams BH3540 Volume Control IC1652 ...
Page 54: ... 54 LB1645 Motor Drive IC1601 LC863316 SUB CPU IC1851 IC Block Diagrams ...
Page 55: ... 55 ML60851 USB I F IC9801 M62393 D A IC212 IC2381 IC Block Diagrams ...
Page 56: ... 56 M62399 D A IC3501 IC3551 IC Block Diagrams PW365 System Control Scan Converter IC301 ...
Page 57: ... 57 STR Z2156 Power Switching IC651 IC Block Diagrams SII161ACT DVI I F IC8001 ...
Page 58: ... 58 TA1287 RGB YUV Converter IC4551 TB1274AF Video Decoder IC1101 IC Block Diagrams ...
Page 59: ... 59 IC Block Diagrams TDA7056 Audio Output IC1631 IC1632 ...
Page 88: ...MA8 XP4500 MB8 XP4000 Mechanical Parts List 88 51 a 51 42 42 51 b 21 a 21 b 21 ...
Page 92: ... MA8A Oct 2001 2000 Printed in Japan SANYO Electric Co Ltd ...