Sequence Of Operations; Speed Control - Canon GP605 Service Manual

CHAPTER 9 EXTERNALS/AUXILIARY MECHANISMS
B.

Sequence of Operations

1.

2-Speed Control

Some of the copier's fans are designed for 2-speed control (Table 9-401). The speed is switched
by the voltage switching circuit of each fan by switching voltage levels.
Some fans are controlled according to the state of the printer, while some are controlled by the
state of the scanning lamp.
DC controller PCB
CPU
In the case of FM2, the voltage is reduced to 18 V during half-speed rotation.
9-8
COPYRIGHT © 1999 CANON INC.
Full-speed
signal
Voltage
Half-speed
signal
switching circuit
Figure 9-402 2-Speed Control Block Diagram
24V 12/18V
24V or 12/18V
Clock signal
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Fan