Canon ImageCLASS MF4690 Service Manual - page 117
Chapter 11
11-1
11.1 Scanning System
11.1.1 Procedure after Replacing the CIS
0016-1880
After replacing the contact image sensor (CIS), go through the following
steps to perform inter-channel output correction:
1) Enter the service mode.
Sequentially press the Additional functions key, 2 key, 8 key, and Additional
functions key on the operation panel.
2) Press the arrow key on the touch panel to display "TEST MODE".
3) Press [OK].
4) Press the [2] key to display "SCAN TEST".
5) Press the [1] key to display "SHADING".
After completion of the above procedure, the contact sensor output is com-
pensated and parameters are set automatically.
After completion of automatic adjustment, "OK" is displayed.
11.1.2 Procedure after Replacing the Copyboard Glass
0016-1882
After replacing the copyboard glass, go through the following steps to per-
form inter-channel output correction:
1) Enter the service mode.
Sequentially press the Additional functions key, 2 key, 8 key, and Additional
functions key on the operation panel.
2) Press the arrow key on the touch panel to display "TEST MODE".
3) Press [OK].
4) Press the [2] key to display "SCAN TEST".
5) Press the [1] key to display "SHADING".
After completion of the above procedure, the contact sensor output is com-
pensated and parameters are set automatically.
After completion of automatic adjustment, "OK" is displayed.
11.2 Electrical Adjustments
11.2.1 Procedure after Replacing the SCNT board
0016-1883
If you have replaced the SCNT board with a new one, perform the following
operations:
Outputting report
Before replacing the SCNT board, output and record the report for the
information such as the user setting and the setting of the service mode.
Service mode > REPORT
Additional functions > Report setting > Report output
After replacing the SCNT board, enter the user data and the service data
according to the report.
Changing the jumper connector
When replacing the SCNT board, change the position of the jumper
connector to ON.
* The SCNT board is shipped with the jumper connector of the lithium
battery OFF.
Make the following adjustments:
- Correction of output between CS channels
1) Enter the service mode.
Sequentially press the Additional functions key, 2 key, 8 key, and Additional
functions key on the operation panel.
2) Press the arrow key on the touch panel to display "TEST MODE".
3) Press [OK].
4) Press the [2] key to display "SCAN TEST".
5) Press the [1] key to display "SHADING".
6) Press [OK].
After completion of the above procedure, the contact sensor output is com-
pensated and parameters are set automatically.
If automatic adjustment fails, "NG" appears. Perform the following proce-
dure:
Clean the scanning area of the ADF and the Backside of copyboard cover of
the host machine, and then retry auto adjustment.