Adjustment - Canon MultiPASS C5000 Service Manual

Part 1: Facsimile
3.1 CS LED Lights-on Duration Adjustment
a)
Overview
This adjustment is used to eliminate uneven scanning which can result from variations in
light intensity between individual LED's, Performing the adjustment will therefore have
an effect on scanned and copied images.
The adjustment value is registered in an SUM IC which has lithium battery back-up and
will not be lost even if power is turned off. However, the SBAM data can become damaged,
for example by battery depletion. In this case, the machine checks the data's validity the
next time power is turned ON. If the data is invalid, the adjustment is made automatically.
If, at this time, the DES detects a document, the machine sounds an error alarm and
displays the
PRESS START/COPY
performs the adjustment once again. Because the user is automatically prompted, it is
almost never necessary to perform this adjustment during normal use. However, if the
SCNT board, Contact sensory ass'y, or lithium battery is replaced, be sure to perform this
adjustment. Also, if the color or brightness of scanned or copied images is faulty,
performing this adjustment may correct the problem.
b) Procedure
following the steps described below.
FUNCTION
Figure 3-2 CS LED Lights-on Duration Adjustment Operation
reverts to #5
NOTE
is displayed. When the
PLEASE WAIT
CALIBRATION.
When contact eeneor malfunction
If, immediately after
PLEASE WAIT
the display now reads PRESS START/COPY, the sensor output is abnormal
changing the LED light s on duration, and the optimal lights-on
duration cannot be determined. Check all connector cables, and verify that
the LED illumination during the adjustment. If illumination does not occur,
there may be a contact sensor malfunction.
After the document is removed, the message
START/COPY key is pressed, the machine
is displayed, an error alarm sounds and
3-6
PLEASE WAIT,