Canon CP660 Service Manual page 105

Reference:
E810: absence of the drum cartridge.
:
Caution
If you have replaced the drum cartridge, be sure to execute auto gradation correction
control in user mode.
COPYRIGHT © 1999 CANON INC.
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Drum cartridge memory
Drum cartridge
MDO1: drum cartridge memory data output signal
MDI1 : drum cartridge memory data input signal
MSK1: drum cartridge memory serial lock signal
MSC1: cartridge memory select signal
OPCSNS: drum cartridge detection signal
Figure 4-202
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
MDO1
MDI1
MSK1
DC controller PCB
MSC1
OPCSNS
4-7