Ae Adjustment - Canon NP7160 Service Manual

2. AE Adjustment

If copies of a newspaper are foggy or if you have replaced the scanning lamp (LA1), AE
sensor, or DC controller PCB, perform the following:
(Be sure that the image is an optimum image before starting the work.)
a. AE Auto Adjustment
1. AE Scanning Intensity Auto Adjustment
1) Select '301' (AE auto adjustment) in service mode.
2) Place the Test Chart (white background original) on the copyboard glass.
3) Press '0' of the keypad so that the copy count indicator indicates '0'.
4) Press the Start key.
• The scanner moves to the AE scan position, stops, and performs AE exposure. Then, the
scanner moves in reverse to home position. (15 sec from start of forward movement and
the end of reverse movement)
• The output of the AE sensor will be indicated in the copy count indicator. Check to make
sure it is 80 ±5. If not, execute '302' (AE scanning intensity adjustment) in service mode.
2. AE Slope Auto Adjustment
5) Select '301' (AE auto adjustment) in service mode.
6) Place a newspaper on the copyboard glass.
7) Press '1' of the keyboard so that the copy count indicator indicates '1'.
8) Press the Start key.
• The scanner moves to the AE scan position, stops, and performs AE exposure. Then, the
scanner moves in reverse to home position. (15 sec from start of forward movement and
the end of reverse movement)
• The output of the AE sensor will be indicated in the copy count indicator. Check to make
sure it is between 0 and 255. If not, execute '303' (AE slope adjustment) in service mode.
9) Press the Reset key to end service mode.
COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10–19