Feed Motor (M1) Control - Canon DADF-H1 Service Manual

2.6.3 Feed motor (M1) control

A control block diagram of the feed motor (M1) is shown below. The feed motor (M1) 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
RMOT_A
RMOT_A*
RMOT_B
IC1
CPU
RMOT_B*
RMOT_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 feed motor on the basis of these commands.
As a stepping motor, the feed motor has the direction and speed of its revolution con-
trolled by varying the output order and frequencies of (M1A • M1A* • M1B • M1B*).
Signal name
RMOT_A
RMOT_A*
RMOT_B
RMOT_B*
RMOT_V-REF
COPYRIGHT © 2001 CANON INC.
F02-206-04
Function
Driving pulse A
Driving pulse A (opposite phase)
Driving pulse B
Driving pulse B (opposite phase)
Reference current value setting
T02-206-01
2000 2000 2000 2000 CANON DADF-H1 REV.0 MAR. 2001
CHAPTER 2 OUTLINE OF OPERATION
+24V
J7
M1A
3
IC7
1
motor
M1A*
4
driver
M1B
5
2
M1B*
6
M1
2-35