Resetting The Eeprom; Setting The Waste Ink Counter - Canon BJC-820 Service Manual

BJC-8200

2.4 Resetting the EEPROM

The EEPROM stores such information as function settings, control ROM version, total
number of sheets passed, total waste ink absorbed, and records of the last user-
unrecoverable error. Once the EEPROM has been reset, there is no way to recover
cleared data. Be careful when resetting the EEPROM.
Since the new EEPROM data is undefined, you must reset the EEPROM when replacing
the logic board.
After the EEPROM is reset, you need to set the waste ink counter, adjust the head
position, and verify the model name.

2.5 Setting the Waste Ink Counter

This printer detects the amount of waste ink based on the total EEPROM data - amount
of waste ink absorbed. After the waste ink absorber is replaced, you must reset the
data.
Before replacing the logic board, you should perform the service test print or the
EEPROM information print to check in advance the total amount of waste ink in the
absorber. If this is not possible, visually check the waste ink absorber and replace if
necessary, or set the waste ink counter to 25%, 50%, and 75%. To determine which
value the counter is to be set to, check how much ink has been absorbed by the
absorber, as a percentage. Use Figure 3-7 as a guide to determine the percentage. Note,
however, that it depends on how the printer has actually been used.
To select the counter value, select "Waste ink setting" in
and press the POWER button. Then, press the RESUME button the number of times listed
below. (The beeper will sound each time the RESUME button is pressed.)
Times
0
1
2
3
4 or more
After the selection, press the POWER button, and the counter will be set to the value
selected, followed by a beep sound. (Also, the printer returns to the service function
selection status.)
After setting the waste ink counter, verify the setting is made correctly by checking
either the service test print or EEPROM information print.
75%: Ink is absorbed
in the top layer.
Figure 3-7 A Guide to Determine the Amount of Waste Ink Absorbed (Sample)
Indicator Functions
Lights in green Waste ink counter cleared
Lights in orange Waste ink counter set to 25%
Lights in green Waste ink counter set to 50%
Lights in orange Waste ink counter set to 75%
Blinks in orange No operation
" 2.1 Service Mode Operations "
50%: The 2nd layer from the top has
become black.
25%: Almost no ink has been absorbed
to the 2nd layer from the top.
3-11
Part 3: OPERATION