Electrical Adjustment - Canon LBP-860 Service Manual

C. Electrical Adjustment
1. Leading edge re&tration adjustment
adjusted at the factory. Therefore, it does
not require adjustment in the field during
installation. However, when the DC
controller PCB is replaced, the leading edge
registration must be readjusted by using
the following procedure. [If you replace the
paper pick-up unit or the laser/scanner
unit. make several Lest prints and check
the leading edge registration is 2.0 mm. If
it is not, ad&s1 it.)
1) Perform steps 1 and 4 on page 3-20.
and replace the DC controller PCB.
2) Set VR202 PCB on the DC controller to
Press the TEST PRINT switch and
obtain several test prints.
3) Measure the distance [a) from the
leading edge of each sheet to the
pattern. (See Figure 6-6) Take the
average of the measured distances.
obtained in step 3 is 2.0 mm according
to Table 6-4.
average value in step 3 is 2.6 mm, the
difference is 0.6 mm. Set VR202 to +2
by turning it clockwise. (See the table
6-4 and figure 6-7.)
step 3 again and confirm that the
leading edge registration is 2.0 mm. If
it is not. perform steps 2 to 5 again.
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For example, if the
Figure 6-6
Table 6-4
Correction VR202 Correcti