Canon FAX-L1000 - Manual (Page 288)

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FAX-L1000 Chapter 4: Maintenance and Service
4.4 Leading Edge Margin Adjustment
a) When
As VR501 on the ECNT board is adjusted at the factory, its adjustment at the time of
installation is not required.
However, when the ECNT board is replaced in the field, the leading edge margin needs to
be readjusted. Also, if the leading edge margin of test prints made after laser/scanner unit
replacement is not 2.0mm, this adjustment is necessary. The adjustment procedures are
shown below.
b) Tools
Tool Use
Phillips screwdriver Removing/inserting screws
Precision phillips screwdriver Adjusting volume
Ruler Measuring leading edge margin of
printed image
c) Adjustment
c-1) Preparations
(1) Open the printer cover and the upper reader frame unit.
(2) Remove the left cover.
(3) Set letter or A4 size recording paper in the cassette.
(4) Close the printer cover and the upper reader frame unit.
c-2) Adjustment
(1) Disconnect the power cord.
(2) After setting the VR501 to the center position (+/–0) on the ECNT board, set the
paper in the cassette.
(3) Connect the power cord.
(4) Press the test print switch (SW501) to make several test prints.
NOTE
When a test print is performed, the Error lamp blinks and “ CHECK
PRINTER ” is displayed.
(5) Measure the length (leading edge margin) from the leading edge to the print pattern.
Measure all the test prints and calculate their average.
(6) Adjust VR501 so that the calculated value in step (5) becomes 2.0mm.
The pattern image shifts in the “+” direction if VR501 is turned clockwise, and in the
“–” direction, counterclockwise. Turning the VR501 one scale shifts the pattern about
0.6mm.
For instance, if the average value calculated in step (5) is 1.4mm, the difference is
0.6mm. Therefore, turn VR501 clockwise for one scale.