Controlling The Pick-Up Motor - Oce 3121 Technical & Service Manual

16 Controlling the pick-up motor

Outline
Block diagram of the control circuit for the pick-up motor.
The pick-up motor is a DC motor.
The microprocessor (Q1) on the RDF control PCB sends the following signals
to the drive circuit:
- the pick-up motor drive signal (SMON)
- the pick-up motor rotation direction signal (SDIR)
- the pick-up motor rotation speed control signal (SMPWM).
The three signals trigger the drive circuit to drive the pick-up motor.
The control circuit is not equipped with a monitor circuit. The SMPWM signal
remains at a constant level.
Q1
CPU
558 TSM Océ 3121
RDF control PBA
SMON
SDIR
Drive
circuit
SMPWM
Pick-up motor
Functional description