Canon FY8-13EX-000, NP6218 service manual AE Adjustment, 10-11

CHAPTER 10 TROUBLESHOOTING

7. AE Adjustment

Adjust the AE mechanism using the following three service modes:

qAE 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

wCopy Density in AE Mode (No. 302)

(developing bias) reference adjustment

eCopy 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’.

COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 10-11