Making Checks - Canon NP6251 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM

4. Making Checks

a. Checking the Voltage at J111B-8 (LAON)
Check to make sure that the voltage between J111B-8 and J111B-5 (GND) on the DC
controller PCB is about 5 V when the scanner is moving forward and 0 V during initial
rotation, when the scanner is moving in reverse, and during post rotation.
b. Intensity/AE Adjustment
Table 4-103 shows items that may be adjusted on the scanning lamp intensity control
circuit.
Service mode
3 Optimum
LIGHT _ 5 intensity
LIGHT 5P adjustment for
potential
control (copy
density at 5)
3
GLEAM _ 5 Optimum
exposure
adjustment
during non-
potential
control (copy
density at 5)
3
AE _ SLOP
AE slope
4-10
COPYRIGHT © 1997 CANON INC.
Function
Intensity
Intensity
Intensity
Copy
density
Table 4-103
Adjustment
Copy
1 5 9 density
Copy
1 5 9 density
1V 5V Input
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Remarks
If the setting is
increased in service
mode, the intensity
during copying will
increase, making the
copy lighter.
If the setting is
decreased in service
mode, the intensity
during copying will
decrease, making the
copy darker.
If the setting is
increased in service
mode, the intensity
during copying will
increase, making the
copy lighter.
If the setting is
decreased in service
mode, the intensity
during copying will
decrease, making the
copy darker.
If the setting is
increased in
adjustment mode, the
copy of a newspaper
will be darker.
When the setting is
decreased in
adjustment mode, the
copy of a newspaper
will be lighter.