Controlling The Pick-Up Motor; Controlling The Pick-Up Motor - Canon CP660 Service Manual

C.

Controlling the Pick-Up Motor

DC controller PCB
D-CPU
(IC201)
M-CPU
(IC202)
66
67
Expansion
68
I/O
(IC203)
69
70
71
The pick-up motor is a 2-phase stepping motor, and is controlled by the pick-up motor
driver (IC211) for pick-up operation.
When the print sequence command is received from the D-CPU (IC202), the M-CPU
(IC201) sends the pick-up motor drive signal (FEDPHA, FEDPHA*, FEDPHB, FEDPHB*)
and the pick-up motor current level switch signal (FEDI0, FEDI1) to the pick-up motor dri-
ver (IC211) by way of the expansion I/O (IC203).
The pick-up motor driver (IC211) uses these signals to supply the motor with the drive
signals (FEDPHA, FEDPHA*, FEDPHB, FEDPHB*) to switch among three motor speeds:
for normal clockwise rotation, normal counterclockwise rotation, and high-speed coun-
terclockwise rotation.
The motor torque varies in relation to rotation speed, requiring variation of the current
level, and the printer unit uses combinations of FEDI0 and FEDI1 signals to find the
appropriate current level for each motor speed.
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
+24UH
FEDPHA
6
9
FEDPHB
23 15
FEDPHA*
5 11
FEDPHB*
22 19
FEDI0
Pick-up
47
motor
FEDI1
24 driver
(IC211)
Figure 5-215
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 5 PICK-UP/FEEDING SYSTEM
Pick-up PCB
FEDPHA
J1201-20
J210-2
-4 FEDPHB -17
-19
-1 FEDPHA*
-3 FEDPHB* -18
J1202-2
Pick-up motor
-4
-1
M5
-3
5-19