Electrical System; Automatic Shading Adjustment - Canon GP160DF Service Manual

CHAPTER 2 STANDARDS AND ADJUSTMENTS
B.

Electrical System

Adjustment items for the electrical system include automatic shading correction and
image positioning adjustment. When the main parts listed for each below are replaced,
perform adjustments.
• When the scanning lamp is replaced: automatic shading adjustment
• When the CCD unit is replaced: automatic shading adjustment
• When the image processor circuit board is replaced: image positioning adjustment,

automatic shading adjustment

1. Automatic shading adjustment
1) Open the 3 covers of the control panel's one-touch panel. Set the slide switch ON
2) Enter the service mode and select TEST MODE. (See page 4-56)
3) Press 2 on the control panel's numeric keypad. (TEST MODE": CCD will be select-
ed.)
4) When you press 8 on the numeric keypad, automatic shading adjustment will start.
5) When OK is displayed on the display, the adjustment is finished.
6) After pressing the control panel stop key, press the clear key. (To exit TEST MODE.)
7) Turn the control panel slide switch OFF.
2. Image positioning adjustment
1) Make a test chart with marks every 1cm from the leading and left edges of the page,
as shown in the figure below.
2-8
Leading edge
10mm
Mark a line
A4 size copy paper
Figure 2-12
Left edge
10mm