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7. AE Adjustment
Adjust the AE mechanism using the following three service modes:
q AE Basic Adjustment
No. 410 .............scanner forward stop
No. 408 ........scanning lamp on check
No. 208 .....AE sensor voltage display
No. 301lamp intensity automatic adjustment at time of AE scan
w Copy Density in AE Mode (No. 302)
(developing bias) reference adjustment
e Copy Density in AE Mode
(developing bias) slope adjustment
If the copy density is not optimum after executing AE basic adjustment q (No. 410,
No. 408, No. 208, No. 301), execute w and then , if necessary, e, i.e., No. 302 and No.
303.
If you have replaced the AE sensor, scanning lamp, or DC controller, adjust the
scanning lamp intensity (VR 301); then, execute AE basic adjustment q, scanner
forward stop (No. 410), scanning lamp on check (No. 408), AE sensor voltage display
(No. 208), and lamp intensity automatic adjustment (No. 301).
Go through the following when making adjustments; Table 10-1 is a list of service
modes excluding scanner forward stop (No. 410), list of service modes excluding
scanner forward stop (No. 410), scanning lamp on check (No. 408), and AE sensor
voltage display (No. 208).
a. AE Basic Adjustment (No. 410, No. 408, No. 208, No. 301)
In this adjustment, the intensity of the scanning lamp is read by the lamp intensity
sensor and the voltage of the AE sensor unit is adjusted by VR 391 on the DC controller.
After the adjustment, execute the lamp intensity automatic adjustment for AE scans.
1) Place the Test Sheet NA-3 on the copyboard, and close the copyboard.
Adjust to the appropriate copy density in non-AE mode (settings) by suing bias
adjustment knob “VR302”. Then press the service mode switch (SW302) to activate
service mode.
2) Enter ‘4’ using the keypad, and press the AE key.
• The display indicates ‘401’.
3) Enter ‘410’ using the keypad.
• The display indicates ‘410’.
4) Press the Start key once.
• The scanner moves forward.
Caution:
Each press moves the scanner forward; do not press more than once.
5) Enter ‘408’ using the keypad, and press the Start key.
• The display indicates ‘ON’, and turns off after about 1.5 sec.
6) Press the Clear key twice.
• The display indicates ‘4’.
7) Press ‘2’ on the keypad, and press the AE key.
• The display indicates ‘201’.
10-11
CHAPTER 10 TROUBLESHOOTING
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)