3–128OPERATIONS AND TIMINGCOPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)If you have replaced the AE sensor, scanninglamp, or DC controller or if you performed scanninglamp intensity adjustment (VR301), you must per-form• AE basic adjustment,• No. 410 scanning forward stop,• No. 408 scanning lamp ON check,• No. 208 AE sensor voltage indication, and• No. 301 AE scanning lamp intensity automaticadjustment.Go through the steps that follow when makingthese adjustments. Table 3-801 gives a list of threeservice modes excluding No. 408 scanning lampON check and No. 208 AE sensor voltage indica-tion.a. AE Basic Adjustment (No. 410, No. 408,No. 208, No. 301)In this adjustment, the intensity of the scanninglamp is read by the lamp intensity sensor, and thevoltage of the AE sensor unit is adjusted usingVR860/851 on the service switch PCB.After making the adjustment, you must performAE scan lamp intensity automatic adjustment.1) Place the Test Sheet NA-3 on the copyboard,and close the copyboard.Press the service mode switch (SW850) to startservice mode.2) Press ‘4’ on the numeric keypad, and press theAE key.• The display indicates ‘401’.3) Press ‘410’ on the numeric keypad.• The machine indicates ‘410’.4) Press the Start key once.• The scanner moves forward.Caution:Each press on the Start key causes the scannerto move forward. Be sure not to press it morethan once.5) Press ‘408’ on the numeric keypad, and pressthe Start key.• The display indicates ‘ON’, and the scanninglamp turns ON about 1.5 sec later.6) Press the Clear key twice.• The display indicates ‘4’.7) Press ‘2’ on the numeric keypad, and press theAE key.• The display indicates ‘201’.8) Press ‘208’ on the numeric keypad.• The machine indicates ‘208’.9) Press the Start key.• The display indicates ‘0’ through ‘255’.10) Adjust VR860/851 on the Service switch PCBso that the display indicates ‘100’ through ‘105’.11) Turn OFF/ON the power switch.• This turns OFF the scanning lamp and turnsON the power once again.12) Press the service mode switch.• The machine starts service mode and indi-cates ‘1’.13) Press ‘3’ on the numeric keypad, and press theAE key.• The display indicates ‘301’.14) Press the Start key.Caution:Wait until initial rotation ends.• After initial rotation, the AE indicator starts toflash.15) Press the AE key so that the following takesplace to perform automatic adjustment.• The AE indicator stops flashing and remainsON.• The scanner moves to the AE measurementpoint.• When the intensity has stabilized, the readingof the AE sensor is stored.• The lamp turns OFF, and the scanner returns.16) After the above ends, press the Clear key twice.• The display indicates ‘3’.17) Press ‘1’ on the numeric keypad, and press theAE key.• The display indicates ‘1’.18) Press ‘116’ on the numeric keypad, and pressthe Start key.• Make sure that the display indicates ‘68’through ‘72’. If not, start with step 2) of opera-tion/inspection mode and make adjustmentsonce again.b. AE Mode Copy Density (developing bias)Reference Point Adjustment (No. 302)1) If the display does not indicate ‘300’s’, startadjustment mode of service mode as you wouldfor No. 301.2) Press ‘2’ on the numeric keypad.• The display indicates ‘302’.3) Press the Start key.• The display indicates the current setting.4) Change the setting using the numeric keypad,and press the AE key.• To increase the setting, press the AE key.
