Olympus OEP-3 Service Manual page 135

2. Ribbon motor drive circuit (Take-up and supply drives)
Motor drive circuits IC609 and IC606 on the SE-539 board are controlled by the control signals at pins 95
and 96 (take-up) and pins 97 and 98 (supply) of IC5 (CPU) on the PRT-13 board. The motor is
accelerated and decelerated proportionally to the reference voltages at pins 20 and 21 of IC11 on the
PRT-13 board.
SE-539
RIBBON_TAKE_UP_MOTOR_BLOCK
IC609
BA6219B
8
VCC2
2
CN604 OUT1
CL622
C617
7P
0.33uF
CL623
8P
10
OUT2
1
SE-539
RIBBON_SUPPLY_MOTOR_BLOCK
IC606
BA6219B
8
VCC2
2
CN604 OUT1
CL600
3P
C601
CL601
4P
0.33uF
10
OUT2
GND
1
OEP-3 V1 (UC)
+12V
R650
2.2
C624
100uF
C623 16V
0.1uF
7
+12GND
TP614 TP615
VCC1
5
IN1
3
CD1
6
IN2
9
CD2
4
VREF
GND
C625
C622
0.1uF
0.1uF
+12GND
+12V
R606
2.2
C611
C608
100uF
0.1uF 16V
7
+12GND
VCC1
5
IN1
TP602 TP603
3
CD1
6
IN2
9
CD2
4
VREF
C612
0.1uF
0.1uF
C605
+12GND
PRT-13
+5V
R679
R678
TP616
10k 10k
CN610 CN601
CL628
22P 9P
CL629 23P 8P
CL630 24P 7P
PRT-13
+5V
10k
10k
TP604
CN610 CN601
CL612 18P 13P
CL613 19P 12P
CL614 20P 11P
IC5
95P
96P
IC11
20P
IC5
97P
98P
IC11
21P
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