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Troubleshooting
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.
AV BOARD
AUDIO-SW
COMPUTER
PC_L/R
AUDIO IN
VIDEO
AV_L/R
AUDIO IN
MONITOR
AUDIO OUT
SPEAKER
Lens Motor Problems
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.
FOCUS
MOTOR
K6U
1
M
2
ZOOM
MOTOR
3
M
4
POWER BOARD
IC5011
IC001
AUDIO
Q5072
10
CONTROL
AV/PC
11
1
13
Q5031
15
2
14
Q5041
2
1
12
Q011
Q5051
Q5061
MUTE On: H
Q5081
MUTE
Q5082
Power
15V
Supply
Circuit
Q65A
Q65B Q65C
ON: H
9V MCI
IC5551
5V_SW
FOCUS
MOTOR DRIVE
3
K6S
4
1
7
5
IC5501
ZOOM
MOTOR DRIVE
3
4
1
7
5
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.
MAIN BOARD
IC2161
D/A
K10U
K3U
PC: H
AV: L
AV/PC
29
7
7
30
8
27
VOLUME
4
28
21
6
|
8
24
IC1881
BUFFER
MUTE
AUDIO MUTE
31
7
13
32
MUTE On: H
K8F
1,3
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.
Logic Table of IC5501/IC5551
Input
Output
4
5
7
H
L
L
L
H
H
H
H
L
L
L
-
KEY SW BOARD
IC1881
BUFFER
POWER
15
3
17
1
16
ON: H
K8S
FOCUS +
33
6
FOCUS -
5
34
IC801
SUB CPU
ZOOM +
29
4
ZOOM -
3
30
-39-
Q1816
Q1817
SCL2_5
2
79,78
3
SDA2_5
IC801
SUB
CPU
IC1831
D/A
Q1818
Q1819
14
SCL1_5
2
80,81
3
SDA1_5
7
Operation
1
H
Forward drive
L
Reverse drive
L
Braking
-
Stand by
LEVEL +
FOCUS
LEVEL -
ZOOM
K68A
3
4
5
3
4
5
K8A
52
51
50
MAIN BOARD
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