Checking The Life Of The Photosensitive Drum - Canon CP660 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
C.

Checking the Life of the Photosensitive Drum

The DC controller PCB makes a check to find out from the data in the drum cartridge
memory whether the photosensitive drum has exceeded its life.
The life data is stored in the drum cartridge memory, and the DC controller updates
the data at such times as programmed. When the data indicates a specific value, the DC
controller PCB judges the fact as the end of the life of the photosensitive drum, and warns
the reader controller PCB of the fact and, at the same time, writes the data to the drum
cartridge memory.
The machine remains capable of making prints even after the warning has been
issued. The DC controller PCB, however, starts to count imaging pages, and will identify
the end of the life of the photosensitive drum when the count reaches a specific value,
upon which it will stop the copier and communicates the fact to the printer board*
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* Reader controller PCB (when making prints with the reader unit installed).
Reference:
Service mode DISPLAY
0: normal
1: end of life warning 1
2: end of life warning 2
4: drum cartridge memory error
E814: stops the machine at the end of life.
If the reader unit is installed, checks may be made by selecting COPIER>
DISPLAY>SENSOR>DRUMLIFE in service mode.
Reference:
The term "imaging pages" means the number of images (Y, M, C, or Bk) written on the
photosensitive drum. For example, in the case of a 4-full-color print, the count is incre-
mented by '4'; in the case of a mono-color print (Y, M, C, or Bk), it is incremented by
'1'.
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COPYRIGHT © 1999 CANON INC.
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CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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