-51-
1. No drive signals supplied at motors
Check drive signals at pins 1 and 2 of K16M for focus
motor, pins 3 and 4 of K16M for zoom motor and pins 1
and 3 of K16L for lens shift motor on M Drive Board.
Check drive signals at pins 2 and 10 of ICs IC1611,
IC1602 and IC1601.
Check ICs IC1611, IC1602 and IC1601 and peripheral cir-
cuits. Check motor drive power supply (15.7V).
2. No drive signals supplied at motor drive ICs.
Check drive signals at pins 5 and 6 of ICs IC1611, IC1602
and IC1601. They are supplied from pins 4 and 5 for focus
drive, pins 6 and 7 for zoom drive and pins 9 and 10 for
lens shift drive of IC1641 D/A control IC.
3. No drive signals output from CPU.
The motor dive signals are supplied from IC801, main
CPU, via the IIC bus control lines.
4. No key switch signals input to CPU.
Check signals at pins 118 to 120 of IC801 when pressing
the key buttons. Check key buttons.
Logic Table of IC1611/IC1602/IC1601
Input
Output
Operation
5
6
10
2
H
L
L
H
Forward drive
L
H
H
L
Reverse drive
H
H
L
L
Braking
L
L
-
-
Stand by
Lens Motor Problems
Troubleshooting
IC1601
LENS SHIFT DRIVE
<LB1645N>
10
9,10
5,6
5,6
2
3
5,6
4,5
6,7
2
IC1611
FOCUS DRIVE
<LB1641>
M
FOCUS
10
2
IC1602
ZOOM DRIVE
<LB1641>
M
ZOOM
10
2
IC1641
I/O EXP
ANDER (MO
TER DIRIVE)
<M62320>
1
2
3
4
1
3
M
LENS SHIFT
K16L
K9B
K9A
K9C
K16M
5
4
K16R
5
4
K8T
K8S
IC801
CPU
IC1801
I/O
EXP
ANDER
IICSCL
LENS TOP DET.
LENS BOTTOM DET.
IICSDA
29
30
13
15
MAIN BOARD
DRIVE BOARD
LENS SHIFT
CONNECT
BOARD
1
3
1
3
Motor driving circuit
Содержание MP-45
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