Canon PC300 Service Manual page 73

PERATIONS AND TIMING
&. Electrical
Note:
If you: have: replaced the scanning lamp
unit, intensity sensor, AE sensor, or.con-
trol panel PCB, you must adjust 'the
three variable resistors on the control
panel PCB (one, if PC300/FC210); you
must, however, adjust them: in the order
of VR604, VR602, and VR603 (from
intensity to AE).
i. Adjusting the Intensity (VR604)
a. After Replacing the Control Panel PCB
Only
1) Disconnect the power plug, and detach
the faulty control panel PCB.
2) Set the meter to the '200 kQ' range, and
measure C between the terminal of
VR604 and the terminal of R614 on the
detached control panel PCB; see Figure
3-42,
3) Likewise, measure C between the termi-
nal of VR604 and the terminal of R614
on the new control PCB; then, turn
VR604 so that the reading is the same
as the measurement taken in step 2).
4) In the case of the PC320/325/FC230,
adjust VR602 (A between terminals of
VR602 and JP607) and VR603 (B
between terminals of VR603 and
JP621); see Figure 3-42A.
5) Attach the new control panel PCB to the
copier.
3-46 COPYRIGHT © 1994 1995 CANON INC.
B (JP621)
A (JP607)
Figure 3-42A (PC320/325/FC230)
C (VR604)
TT
Control panel PCB
Figure 3-42B (PC300/FC210)
C (R614)
)
CANON PC300/920/325,FC210220 REV.1 FEB. 1995 PRINTED IN JAPAN (IMPRIME AU JAPON)