Pickup Motor (M2)Control - Canon DADF-H1 Service Manual

CHAPTER 2 OUTLINE OF OPERATION

2.4.4 Pickup motor (M2)control

A control block diagram of the pickup motor (M2) is shown below. The pickup motor is
a four-phase stepping motor. This circuit mainly implements the following kinds of control:
• Motor ON/OFF control
• Motor revolution direction control
• Motor revolution speed control
KMOT_A
KMOT_A*
KMOT_B
IC1
CPU
KMOT_B*
KMOT_V-REF
ADF controller PCB
The CPU (IC1) mounted on the ADF controller PCB receives print mode communications
data (such as scale, operation mode, and timing) from the host as commands. It generates
driving pulses to the pickup motor on the basis of these commands.
As a stepping motor, the pickup motor has the direction and speed of its revolution con-
trolled by varying the output order and frequencies of (M2A¥M2A*¥M2B¥M2B*).
Signal name
KMOT_A
KMOT_A*
KMOT_B
KMOT_B*
KMOT_V-REF
2-30
motor
driver
F02-204-07
Function
Driving pulse A
Driving pulse A (opposite phase)
Driving pulse B
Driving pulse B (opposite phase)
Reference current value setting
T02-204-01
COPYRIGHT © 2001 CANON INC.
+24V
J8
M2A
3
IC8
1
M2A*
4
M2B
5
2
M2B*
6
2000 2000 2000 2000
M2
CANON DADF-H1 REV.0 MAR. 2001