43
UF-5500 / 4500
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
Main PCB
IC700
IC300
3
A10
1
10
B10
12
4
C10
24
A9
23
6
B9
13
C9
14
7
D9
20
9
22
D8
Motor current
control circuit
ADF
Motor
24V
CN701
3.3V
1
2
3
4
24V
R7
0
8
R7
0
7
5
8
RNF1
RNF2
Over current
protection circuit
CRM5
CRM4
CRM3
CRM2
CRM1
CRM0
ADFMEN
PWD
VM1
VM2
OUT1A
OUT2A
OUT1B
OUT2B
PHA1
PHA2
I01
I11
I02
I12
PS
Vref
Summary of Contents for UF-4500
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