Sanyo PLC-XU45, Service Manual

Page: 39 / 115

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1. No drive signals supplied at motors
Check drive signals at pins 1 to 4 of K6U on Power Board.
Check ICs IC5501, IC5551 and peripheral circuits. Check
motor drive power supply (9VMCI).
2. No drive signals supplied at motor drive ICs.
Check drive signals at pins 3-4 (ZOOM), 5-6 (FOCUS) of
k6S. Check IC801.
3. No drive signals output from CPU.
Check drive signals at pins 29,30, 33, 34 of IC801(SUB
CPU). Check IC801.
4. No key switch signals input to CPU.
Check signals at pins 50 to 52 of IC801 when pressing the
key buttons. Check key buttons.
Troubleshooting
1
7
3
34
29
30
33
1
4 52
51
50
5
3
17
1 6
15
16
5 2
IC5551
FOCUS
MOTOR DRIVE
IC1881
BUFFER
IC801
SUB CPU
1
7
3
4
5
3 4
3 4
IC5501
ZOOM
MOTOR DRIVE
M
M
FOCUS
MOTOR
ZOOM
MOTOR
K6U K6S K8S
K8A
K68A
KEY SW BOARD
MAIN BOARD
POWER BOARD
9V MCI
15V
FOCUS +
FOCUS -
ZOOM +
ZOOM -
3 4 5
3 4 5
FOCUS
ZOOM LEVEL +
LEVEL -
Power
Supply
Circuit
Q65A
Q65B Q65C
5V_SW
POWER
ON: H
ON: H
Logic Table of IC5501/IC5551
Input Output Operation
4 5 7 1
H L L H Forward drive
L H H L Reverse drive
H H L L Braking
L L - - Stand by
Lens Motor Problems
IC2161
D/A
AV/PC
7
8
IC1831
D/A
AUDIO MUTE
IC1881
BUFFER
13 7
MUTE
IC5011
AUDIO-SW
1
13
2
12
10
11
15
14
PC_L/R
AV_L/R
IC001
AUDIO
CONTROL
2
1
4
6
8
Q5072
Q1816
Q1817
Q1818
Q1819
Q011
AV/PC
Q5031
Q5041
Q5051
Q5061
Q5081
Q5082
MUTE
VOLUME
SPEAKER
7
2
3
2
3
14
7
SCL2_5
SDA2_5
SCL1_5
SDA1_5
IC801
SUB
CPU
80,81
79,78
COMPUTER
AUDIO IN
VIDEO
AUDIO IN
MONITOR
AUDIO OUT
29
30
27
28
21
|
24
31
32
1,3
K3U K10U
K8F
AV BOARD MAIN BOARD
PC: H
AV: L
MUTE On: H
MUTE On: H
No Sound
1. No audio signals at AV input circuit.
Check audio signals at pins14 and 15 of IC5011 on the AV
Board. Check IC5011 and peripheral circuits.
2. Incorrect operation of VIDEO/COMPUTER mode
switching.
Check AV/PC switching signal at pins 10 and 11 of IC5011.
Check IC5011, IC801 and switching signal.
AV : Low, PC : High
3. No audio output signal at speaker.
Check audio signal at pins 1 and 3 of K8F on the Main
Board.
Check MUTE signal at pin 1 of IC001.
Mute On : Low
Check MUTE signal at pin 7 of IC1831, pins 7 and 13 of
IC1881, and peripheral circuit.
Mute On : High
Check sound volume signal at pin 4 of IC001, and pin 14
of IC1831.Check IC IC001, IC1831 and peripheral circuit.
Volume Min.: Low
4. No power supply at audio circuit.
Check 6V(6V AUDIO) power supply line.