1.4 Lens Motor Problems
1) No drive signals supplied at motors
• Check drive signals at pins 1 to 4 of K6U on Power Board.
• Check IC IC5501, IC5551 and peripheral circuits. Check motor drive power supply
(9VMCI).
2) No drive signals supplied at motor drive IC
• 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.
Part 4: Troubleshooting
4-8
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
Fig. 4-4
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
Summary of Contents for LV-7355J
Page 9: ...Part 1 General Information ...
Page 22: ...Part 2 Repair Information ...
Page 43: ...Part 3 Adjustment ...
Page 65: ...Part 4 Troubleshooting ...
Page 82: ...Part 4 Troubleshooting 4 17 BA7078AF Selector IC6241 CXA2101AQ RGB Matrix IC4101 ...
Page 85: ...Part 4 Troubleshooting 4 20 ML60851 USB I F IC9801 M62393 D A IC2571 ...
Page 86: ...Part 4 Troubleshooting 4 21 TB1274AF Video Decoder IC1101 TA1318N AFC Detector IC6171 ...
Page 88: ...Part 5 Parts Catalog ...
Page 89: ......
Page 107: ...Part 6 Electrical Diagrams ...
Page 117: ......