Canon BJC-55 Service Bulletin

Also see for BJC-55 Series: Service manual User manual Start here User manual Specification

3. PRECAUTION FOR SERVICE3.1 Precautions Concerning the Memory DataThis printer counts the total waste ink amount for the black BJ cartridge and the colorBJ cartridge and stores these data in the EEPROM on the control board. Observe thefollowing precautions during servicing.1) Checking EEPROM dataThe number of sheets printed is counted and stored in the EEPROM to show theprinter operating status. This data can be printed by test print 3 (Ripple patternprint).The waste ink quantity data is also stored in the EEPROM. This data is used toindicate a waste ink full error to prevent ink leakage if the amount of waste inkabsorbed becomes full.2) When replacing the control boardIf the control board on which the EEPROM is mounted is replaced, the quantity ofwaste ink absorbed must be set in the EEPROM by visually checking the amount ofwaste 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 unitIf a waste ink full error is displayed and the printer base unit is replaced, the wasteink amount data in the EEPROM must be set to zero. If it is not set to zero, a wasteink full error is displayed and the printer stops operating before the waste inkabsorber is filled with waste ink.After the EEPROM is rest, the data it contained cannot be printed out witha test printout.If you want to check the stored data, be sure to execute test printoutbefore resetting the EEPROM.When the stored data is reset, both the total count of printed sheets andthe total waste ink amount will be reset together. These settings cannotbe reset individually.4) Rewriting the flash ROMThe flash ROM on the control board serves as the control section of the printer. Inearlier models a socket type masked ROM had to be upgraded by physically insertinga new upgraded masked ROM. The flash ROM can be rewritten and hence upgradinghas been facilitated.When flash ROM needs to be upgraded, a FD containing the upgrading program willbe distributed. Using this FD in a computer, the flash ROM of the printer can beupgraded. In order to rewrite the flash ROM, both the printer and computer need tobe set in the rewrite modes.For details on checking the memory data with test print and for clearingthem, seePart 3: 3.6 EEPROM Data Setting (page 3-23).When operation is stopped for the waste ink full error, handle the printeras explained inPart 5: 5. TROUBLESHOOTING (page 5-5 ).When rewriting the flash ROM, refer to the settings inPart 3: 3.7 Rewritingthe Flash ROM (page 3-26).1-11BJC-50Part 1: Safety and Precautions