Scanner Motor Control Circuit; Relationship Between Scanner Sensor And Signals - Canon NP7160 Service Manual

B. Scanner Motor Control Circuit
The scanner motor (M2) is a 4-phase stepping motor, and is controlled by four pulse signals
(SC_A, SC_B, SC_A*, SC_B*) generated by the DC controller PCB.
The scanner motor is turned on/off and its direction of rotation are controlled by changing
the timing at which these four pulse signals are generated. The speed of rotation, on the other
hand, is controlled by switching the current supplied to the scanner motor.
DC controller PCB
+24V
Scanner
IC119
control
(CPU)
(IC117)
C. Relationship between Scanner Sensor and Signals
Sensor Signal
Scanner
home position
SCHP
sensor (PS1)
COPYRIGHT © 1998 CANON INC.
J104
-A3
-A5
-A2
-A4
-A1
motor
circuit
Figure 3-302
Scanner
Foward Reverse
Table 3-301
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
J37
SC_COM
-3
SC_A
-1
SC_A*
-4
SC_B
-2
SC_B*
-5
Description
• The scanner is at home position.
• The scanner has reached home position.
Scanner
M2
motor
3–7