Filter
Top Products
3–128
OPERATIONS AND TIMING
COPYRIGHT
©
1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
If you have replaced the AE sensor, scanning
lamp, or DC controller or if you performed scanning
lamp 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 automatic
adjustment.
Go through the steps that follow when making
these adjustments. Table 3-801 gives a list of three
service modes excluding No. 408 scanning lamp
ON 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 scanning
lamp is read by the lamp intensity sensor, and the
voltage of the AE sensor unit is adjusted using
VR860/851 on the service switch PCB.
After making the adjustment, you must perform
AE 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 start
service mode.
2) Press ‘4’ on the numeric keypad, and press the
AE 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 scanner
to move forward. Be sure not to press it more
than once.
5) Press ‘408’ on the numeric keypad, and press
the Start key.
• The display indicates ‘ON’, and the scanning
lamp 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 the
AE 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 PCB
so that the display indicates ‘100’ through ‘105’.
11) Turn OFF/ON the power switch.
• This turns OFF the scanning lamp and turns
ON 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 the
AE key.
• The display indicates ‘301’.
14) Press the Start key.
Caution:
Wait until initial rotation ends.
• After initial rotation, the AE indicator starts to
flash.
15) Press the AE key so that the following takes
place to perform automatic adjustment.
• The AE indicator stops flashing and remains
ON.
• The scanner moves to the AE measurement
point.
• When the intensity has stabilized, the reading
of 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 the
AE key.
• The display indicates ‘1’.
18) Press ‘116’ on the numeric keypad, and press
the Start key.
• Make sure that the display indicates ‘68’
through ‘72’. If not, start with step 2) of opera-
tion/inspection mode and make adjustments
once again.
b. AE Mode Copy Density (developing bias)
Reference Point Adjustment (No. 302)
1) If the display does not indicate ‘300’s’, start
adjustment mode of service mode as you would
for 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.