Controlling The Main Motor - Canon CP660 Service Manual

E.

Controlling the Main Motor

DC controller PCB
D-CPU
(IC201)
M-CPU
(IC202)
Extension I/O
(IC203)
The main motor is a 3-phase 8-pole DC brushless motor. The main motor is controlled
by an M-CPU (IC202) by way of an extension I/O, and it serves to drive the pickup-, feed-
ing-, fixing-, and delivery-related rollers and the secondary transfer belt/ITD cleaning
roller cams.
When the print sequence command*
CPU (IC202) causes the main motor drive signal (MON*) to go '0' by way of the exten-
sion I/O (IC203) to rotate the main motor.
The main motor causes the main motor ready signal (MRDY*) to go '0' when it reach-
es a specific speed.
The motor is switched to either of three speeds in response to combinations of main
motor speed switch signals (MSPED1, MSPED2); i.e., normal, 1/4 speed (transparency
mode), and 1/3 speed (thick paper mode).
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
+5V
+24UH
Figure 2-117
1
is received from the D-CPU (IC201), the M-
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 BASIC OPERATION
J219-6 J1-1
24UH
-3 MRDY* -4
-1 -6
MSPED1
-2 -5
MSPED2
-4
MON* -3
-5 GND -2
Main motor
M4
2-19