Panasonic UF-5500 Service Manual page 43

6.7.2.3. ADF (Auto Document Feeder) Motor drive circuit
1. Functions
This motor functions for main operations including FAX transmission, ADF copy and PC scan.
This motor feeds document, which are set to ADF with synchronizing for reading.
2. Motor operation
During motor driving, pin D9 of IC 300 become low level, then motor driver IC700 is activated.
Stepping pulses are output from IC300 pins A9, B9, C9, A10, B10, and C10, causing driver IC700 pin 4, 6, 7 and 9 to drive the
motor coil.
A 1-step rotation of this motor feeds 0.042mm of document.
3. Circuit Diagram
IC300
A10
CRM0
B10
CRM1
C10
CRM2
A9
CRM3
B9
CRM4
C9
CRM5
D9
ADFMEN
3.3V
D8
Motor current
PWD
control circuit
Main PCB
1
PHA1
12
PHA2
24
I01
23
I11
13
I02
14
I12
20
PS
Over current
22
protection circuit
Vref
RNF1
5
24V 24V
IC700
3
VM1
10
CN701
VM2
4 1
OUT1A
2
6
OUT1B
3
7
OUT2B
4
9
OUT2A
RNF2
8
43
UF-5500 / 4500
ADF
Motor