2-32
COPYRIGHT © 1999 CANON INC.
CANON ADF FOR iR600 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 OPERATIONS
6.
Controlling the Separation Motor (M4)
Figure 2-227 shows the circuit used to control the separation motor (M4). The separation motor
is a DC motor, and the circuit has the following functions:
Turning on and off the motor
Controlling the motor speed
Protecting the motor from over current
Figure 2-227
When the CPU generates the motor rotation speed signal (SPPWM), the separation motor (M4)
starts to rotate in a specific direction. The separation motor clock sensor (PI2) sends the separation
motor rotation speed signal (SPCLK) to the speed control circuit. In response, the speed control
circuit compares the rotation speed signal and the speed reference signal (SEPCLKREF) from the
CPU, and sends the speed control signal (SPMFV) to the CPU.
The CPU varies the rotation speed signal based on the speed control signal it receives. LED3
turns on as long as the rotation speed of the motor remains within a specific range, and turns off when
it is otherwise.
The current detection circuit monitors the current flowing into the separation motor at all times,
and will generate the separation motor stop signal (SPLIM) to stop the motor when the current ex-
ceeds a specific level.
If the separation motor stop signal is generated continuously, the CPU will identify the condition
as an error in the separation motor, causing the copier to indicate an error code (E405).
M4
SPLIM
SPPWM
SPCLK
SEPCLKREF
SPMFV
+24R
+5V
J12
J8
PI 2
Speed
control
circuit
Current
detection
circuit
Q1
CPU
Q48
Q50
LED3
Q7
Q17
1
2
5
ADF controller PCB
Separation
motor
Separation
motor
clock sensor
Related Error Code
• Error in the separation motor (M4)
• Error in the separation motor clock sensor (PI2)
• Error in the ADF controller PCB
E405