Canon NP6317, Service Manual

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CHAPTER 10 TROUBLESHOOTING
COPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-19
3. Lamp Brightness Adjustment (50%, 200%)
Before adjusting the lamp brightness (50%, 200%), adjust the optimum exposure in the direct
reproduction ratio (F5, w/o AE, copy density knob is centered, using the NA3 chart). Then, per-
form the adjustment below.
a. Adjusting the Lamp Brightness (50%)
1) Make a 50% copy.
2) Check the exposure; if it is not satisfactory, perform the following:
3) Enter service mode C24.
4) Modify the value using the +/- keys (increasing the value makes the copy density lighter;
standard value is 110 to 120, variation of ten steps is equivalent to approximately one step of F
of the exposure lever on the control panel).
5) Make a 50% copy; if the copy density is not yet satisfactory, repeat steps 3) to 4).
b. Adjusting the Lamp Brightness (200%)
1) Make a 200% copy.
2) Check the exposure; if the density is not satisfactory, perform the following:
3) Enter service mode C25.
4) Modify the value by +/- keys (increasing the value makes the copy density lighter, standard
value is 140 to 170, variation of ten steps is equivalent to approximately one step of F of the
exposure lever on the control panel).
5) Make a 200% copy; if the copy density is not yet satisfactory, repeat steps 3) to 4).