Canon PC980 Service Manual - Page 57
Controlling the Scanner/Lens Drive Motor, Aa. BOutline
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CHAPTER 3 EXPOSURE SYSTEM 5. Controlling the Scanner/Lens Drive Motor a. Outline The scanner/lens drive motor (M2) is a 4-phase stepping motor. The timing at which the drive power (SC-COM) and pulses (SC-A, SCA*, SC-B, SC-B*) are generated is controlled to turn on/ off the scanner/lens drive motor (M2) or to switch the direction of its rotation. (Q101) DC controller PCB +24VU R399 J110 SC-COM SC-COM Microprocessor A A* B B* Current switching signal 1 Current switching signal 2 Current switching signal 3 (Q109) Motor driver circuit SC-A SC-A* SC-B SC-B* M2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-7
CHAPTER 3
EXPOSURE SYSTEM
COPYRIGHT
©
1999
CANON INC.
CANON
PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-7
Current switching signal 1
Current switching signal 2
Current switching signal 3
(Q101)
(Q109)
DC controller PCB
A
A*
B
B*
SC-COM
SC-COM
J110
SC-A
SC-A*
SC-B
SC-B*
M2
Motor
driver
circuit
+24VU
R399
Microprocessor
5.
Controlling the Scanner/Lens Drive Motor
a.
Outline
The scanner/lens drive motor (M2) is a 4-phase stepping motor. The timing at which the drive
power (SC-COM) and pulses (SC-A, SCA*, SC-B, SC-B*) are generated is controlled to turn on/
off the scanner/lens drive motor (M2) or to switch the direction of its rotation.