When Replacing The Cis Unit; Removing The Adf Upper Cover Unit; Procedure - Canon imageRUNNER 1750 Series Service Manual

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Disassembly/Assembly > Original Exposure/Feed System > Removing the ADF Upper Cover Unit > Procedure

■ When Replacing the CIS Unit

Perform the following operation after replacing the CIS Unit.
● CIS gain and offset correction
1) Enter service mode.
SCAN > READER > FUNCTION > CCD > CCD-ADJ
2) Press "OK".
After this operation, output correction of the Contact Image Sensor is automatically
performed to set the parameter.
3) After auto adjustment is completed, OK is displayed.
(It will take approx. 15 seconds for this adjustment. During that time, display on the Control
Panel will not be changed.)
● DF white level adjustment (book mode scan/stream reading scan)
1) Place a sheet of paper which is normally used by the user on the Copyboard Glass,
and execute the following: service mode > SCAN > READER > FUNCTION > CCD >
DFWLVL1.
The white level during BOOK mode is read (checking the transmission of the glass for
BOOK mode).
2) Place a sheet of paper which is normally used by the user on the ADF, and execute the
following: service mode > SCAN > READER > FUNCTION > CCD > DF-WLVL2.
The white level during DF mode (stream reading) is read (checking the transmission of the
glass for stream reading) (reading both sides of the chart).
3) Place a sheet of paper which is normally used by the user on the Copyboard Glass, and
execute the following: service mode > SCAN > READER > FUNCTION > CCD > DF-
WLVL3.
The white level during BOOK mode is read (checking the transmission of the glass for
BOOK mode).
4) Place a sheet of paper which is normally used by the user on the ADF, and execute the
following: service mode > SCAN > READER > FUNCTION > CCD > DF-WLVL4.
The white level during DF mode (stream reading) is read (checking the transmission of the
glass for stream reading) (reading both sides of the chart).
4 Disassembly/Assembly > Original Exposure/Feed System > Removing the ADF Upper Cover Unit > Procedure

Removing the ADF Upper Cover Unit

■ Procedure

CAUTION:
Be sure not to touch the surface of the Roller and the Pad when disassembling/
assembling.
1) While pulling the [A] part of the ADF Front Cover, release the [B] part which works as an
open/close stopper and open the ADF Upper Cover Unit [1].
[1] [A]
4-48
[B]
F-4-80
4-48