Precautions When Servicing Printer; Stored Data - Canon WS8400 Service Manual

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3. Replacing the maintenance cartridge
When the maintenance cartridge detects that tank is full, the "Replace MT cartridge" error appears. In this case the maintenance cartridge must be replaced.
The printer will not operate until the error is canceled.
Be careful that the waste ink does not splash when you remove the used maintenance cartridge from the printer.
MEMO:
This printer has an EEPROM in the maintenance cartridge and the maintenance cartridge status is controlled by the engine firmware which reads and writes
the content of that EEPROM. Therefore, the counter information need not be initialized when the maintenance cartridge is replaced.
4. Refilling the ink
After removing the ink in the printer according to the automatic or manual ink draining procedure to disassemble, reassemble, or transport/ship the printer,
refill the ink as soon as possible upon completion of those tasks.
If the ink remaining in the printer after the removal has dried up, the ink deposits on the surfaces of the components may cause damage or abnormal
operation.

1.7.3 Precautions When Servicing Printer

1.7.3.1 Stored Data

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This printer counts the printing length, number of ink tank replacements, carriage driving time, number of cleanings, and the cutter usage, and stores this
information in the system controller EEPROM (IC10) and in the engine controller EEPROM (IC28) as the service mode counter.
The counter holds important information for indicating printer usage status.
You can check the printer information in the counter by printing it in service mode or displaying it on the display.
Be sure to follow the precautions below when servicing the printer.
1) Repairing or replacing the PCB
Follow the "Each Controller Replacement Procedures" when replacing the system controller and engine controller.
Reference:
For the "Each Controller Replacement Procedures," see Disassembly/Reassembly> Points to Note on Disassembly and Reassembly> PCBs.
2) After replacing the carriage unit
The information on the carriage driving time is generated from the carriage unit.
Initialize (clear) the carriage driving time information after replacing the carriage unit.
3) After replacing the purge unit
The information on the number of cleanings is generated from the purge unit. Initialize (clear) the number of cleanings information after replacing the
purge unit.
You cannot check the counter information once it is initialized (cleared).
Be careful that you do not perform the initialization before checking the information.
Also, you cannot modify the counter information from the operation panel.
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