Oki OKIOFFICE 84 Service Manual page 396

A3.1.8 R51 Circuit Diagram (Page 8/12)
1. Block diagram
The circuit diagram shown on page 8/12 consists of the following functions and connectors:
l
IC9 (Drum motor driver)
l
Connector CN13 that provides an interface between R51 board and the drum motor.
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 IOGAA (CPU). This drum motor rotates the
image drum.
Service Guide OKIOFFICE 84
Chapter A Board Descriptions
Page: 236