Canon CP660 Service Manual page 366

CHAPTER 10 TROUBLESHOOTING
:
Caution
1. Do not disconnect the power cord while the printer is in service mode. (Be sure to
turn off the power first to end service mode; however, do not turn off the power
while test mode, read memory mode, or write memory mode is under way.)
2. When the power is turned on normally, various adjustment data in the EEPROM on
the DC controller PCB is mounted to the printer unit and the paper is turned on nor-
mally, the data stored on the printer board will be lost. If you are replacing the DC
controller PCB, be sure to write the various adjustment data in read memory mode
to the RAM on the printer board, and then write it to the EEPROM on the new DC
controller PCB in write memory mode.
Power Turned On Normally
Printer board
RAM
EEPROM
For back-up
Power Turn On in Service Mode
Printer board
RAM
EEPROM
For back-up (stored)
10-84
COPYRIGHT © 1999 CANON INC.
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Writing
Figure 10-601
Writing
Figure 10-602
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
DC controller PCB
EEPROM
DC controller PCB
EEPROM