Sanyo 1 122 121 00, Service Manual

Page: 39 / 84

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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
AV BOARD
AV SUB BOARD
IC5011
AUDIO-SW
1
13
2
12
10
11
15
14
PC_L/R
AV_L/R
IC001
AUDIO
PRE-AMP.
1, 7
2
4
2, 6
5
3
IC031
AUDIO
CONTROL
17
14
18
13
Q5072 Q5071
AV/PC
AV/PC
Q011
Q021
Q5031
Q5042
Q2051 MUTE
COMPUTER
AUDIO IN
VIDEO
AUDIO IN
EXTERNAL
SPEAKER
L
R
9
3
4
6
8
10
11
7
IC2161
D/A
AV/PC
7
8
IC1831
D/A
AUDIO MUTE
IC1881
BUFFER
13
7
MUTE
Q1817
Q1817
Q1818
Q1819
VOLUME
SPEAKER
7 13
2
3
14
7
SCL2_5
SDA2_5
SCL1_5
SDA1_5
IC801
SUB
CPU
80,81
79,78
29
30
27
28
21
|
24
31
32
1,3
K3U
K10Y
K10X
K10U
K8F
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 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 Main Board.
Check MUTE signal at pin 4 of IC031.
Mute On : High
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 pins 27, 28 of K10U, and
pin 14 of IC1831.Check IC IC001, IC031 and peripheral
circuit.
Volume Min.: Low
4. No power supply at audio circuit.
Check 6V(6V AUDIO) power supply line.