Precaution For Service; Precautions Concerning The Memory Data - Canon BJC-55 Service Manual

BJC-50

3. PRECAUTION FOR SERVICE

3.1 Precautions Concerning the Memory Data

This printer counts the total waste ink amount for the black BJ cartridge and the color
BJ cartridge and stores these data in the EEPROM on the control board. Observe the
following precautions during servicing.
1) Checking EEPROM data
The number of sheets printed is counted and stored in the EEPROM to show the
printer operating status. This data can be printed by test print 3 (Ripple pattern
print).
The waste ink quantity data is also stored in the EEPROM. This data is used to
indicate a waste ink full error to prevent ink leakage if the amount of waste ink
absorbed becomes full.
2) When replacing the control board
If the control board on which the EEPROM is mounted is replaced, the quantity of
waste ink absorbed must be set in the EEPROM by visually checking the amount of
waste ink absorbed into the absorber from behind the printer base unit.
If it is not set, the waste ink full error is not displayed, and ink may leak.
3) When replacing the printer base unit
If a waste ink full error is displayed and the printer base unit is replaced, the waste
ink amount data in the EEPROM must be set to zero. If it is not set to zero, a waste
ink full error is displayed and the printer stops operating before the waste ink
absorber is filled with waste ink.
4) Rewriting the flash ROM
The flash ROM on the control board serves as the control section of the printer. In
earlier models a socket type masked ROM had to be upgraded by physically inserting
a new upgraded masked ROM. The flash ROM can be rewritten and hence upgrading
has been facilitated.
When flash ROM needs to be upgraded, a FD containing the upgrading program will
be distributed. Using this FD in a computer, the flash ROM of the printer can be
upgraded. In order to rewrite the flash ROM, both the printer and computer need to
be set in the rewrite modes.
After the EEPROM is rest, the data it contained cannot be printed out with
a test printout.
If you want to check the stored data, be sure to execute test printout
before resetting the EEPROM.
When the stored data is reset, both the total count of printed sheets and
the total waste ink amount will be reset together. These settings cannot
be reset individually.
For details on checking the memory data with test print and for clearing
them, see Part 3: 3.6 EEPROM Data Setting (page 3-23).
When operation is stopped for the waste ink full error, handle the printer
as explained in Part 5: 5. TROUBLESHOOTING (page 5-5 ) .
When rewriting the flash ROM, refer to the settings in Part 3: 3.7 Rewriting
the Flash ROM (page 3-26) .
Part 1: Safety and Precautions
1-11