Oki OKIOFFICE44 Service Manual page 275

A3.1.9 R44 Circuit Diagram
1. Block diagram
The circuit diagram consists of the following functions and connectors:
• IC9 (Drum motor driver)
• TR4/TR2 (Clutch driver)
• Connector CN15 that provides an interface between R44 board and the resist motor.
• Connector CN2 that provides an interface between R44 board and the clutch.
Figure A3.1.11 shows the related signals of the drum motor and clutch.
2. Function
1) Drum motor control
This drum motor is driven by the motor driver IC9. It is two-phase excited and bipolar-
driven according to the DMPH1, DMPH2 and DMON1-N signals that are generated from
the CPU. This drum motor rotates the image drum.
2) Clutch
When starting to print, performs the paper supply of recording paper by using this clutch.
Clutch is driven by CLUTCH signal generated from CPU.
DMPH1
DMPH2
CPU
DMON1-N
Clutch
Figure A3.1.11 Related Signals of Drum Motor and Clutch
Board Descriptions
IC9 DM-T1
DM-T2
Drum motor
DM-T3
drive
DM-T4
(2 phase excitation)
TR4/TR2
PJON
Clutch
drive
A - 33 OKIOFFICE 44 Serv. Man., P/N 59276801
R44
CN15
1
2
3
4
CN2
2
OV
Clutch
1
Drum motor
M