Canon PC300 Service Manual page 74

<OPERATIONS AND TIMING 83:
b. After Replacing the Scanning Lamp Unit,
Intensity Sensor, or AE Sensor
(Before Adjustment)
+ If the scanning lamp has blackened,
replace it.
* Clean the scanning system (lens array,
lamp reflector, lamp).
1) Set the cartridge to the copier.
2) De-select AE, and set the copy density
control lever/dial to the center.
8) Set the density correction switch
(SW606) to the center (PC320/325/
FC230).
4) Set the Test Sheet (NA3/NB3/NA2), and
make a copy.
5) Check if the copy is free of fogging, and
gray scale No. 9 (No. 10, if NB3) is
somewhat visible.
» If too dark,
Turn VR604 on the control panel PCB
clockwise slightly to increase the inten-
sity.
* If too light,
Turn VR604 counter clockwise slightly
to decrease the intensity.
7) Repeat steps 4) and 5) until the density
is optimum.
NOC ocr resco
- After adjusting the intensity, be sure to
adjust the AE mechanism (PC320/325/
FC230).
COPYRIGHT © 1994 1995 CANON INC.
2. Adjusting the AE Mechanism (VA602,
VFi603)
(Before Adjustment)
« Obtain a newspaper whose text con-
sists of fine print; do not use a section
with photos or large characters.
« Make sure you have adjusted light
intensity.
1) Switch the copier OFF.
2) Detach the control panel cover.
3) Turn VR602 and VR603 on the control
panel PCB fully clockwise.
4) Place a newspaper over the AE light-
receiving section of the copyboard, and
close the copyboard cover.
AE light-receiving section
Figure 3-43