III.
Note
If the proper void area is not obtained, the separation ability in
the photoconductor section may be degraded and dirt on the
fuser section pawl may be increased.
Before performing this adjustment, the following adjustments
must have been completed. If not, this adjustment cannot be
performed properly.
*
Adjustment of paper pressure against the SPF resist roller
(Sim 51-2 set value must be properly set.)
*
Adjustment of the copy image position on the copy paper
(Sim 50-1 set value must be properly set.)
IV.
Cases when the adjustment is required
1) When the optical section is disassembled or its part is
replaced (including the scanner home position sensor).
2) When the SPF unit is disassembled or its part is replaced.
3) When the main PWB is replaced.
4) When the RAM in the main PWB is replaced.
5) When "U2" trouble occurs.
6) When the resist roller unit is disassembled or replaced.
7) When the blank lamp is replaced.
V.
Necessary tools
*
Screwdriver
*
Scale
*
Test chart
VI.
Adjustment procedures
(Copy image position adjustment)
1) Execute simulations 50-1 and select the copy image posi-
tion adjsutment (set values A and B).
This simulation allows the copy image position adjustment
and the lead edge/rear edge void amount adjustment.
Selection is made by the density select key.
Set
value
Display lamp
Exposure
level 1
Exposure
level 3
Exposure
level 5
A
Auto density
lamp
Lead edge
void
Set value A
Rear edge
void
B
Auto/Manual
density lamp
Set value B
This simulations is to adjust the copy image position for the
paper. One of the set adjustment values is displayed on the
COPY QUANTITY display.
Adjustment value A:
Corresponds to the time interval from the scanner unit
starting and the scanner home position sensor OFF to
reaching at the lead edge of the document. That is, this is
the value used to determine the optical document lead
edge reference position, and it must be fit with the edge
section of the document reference plate.
If this value is improper, when the copy magnification ratio
is changed, the copy image lead edge position for the copy
paper edge will fluctuate.
Adjustment value B:
Corresponds to the time interval from the scanner unit
starting and the scanner home position sensor OFF to the
resist roller ON.
According to this value, the paper feed timing for the image
on the photoconductor drum is changed and the copy
image position on the copy paper is also changed.
When the set value is changed by "1," the position of the
copy image on the copy paper is changed by about 0.176
mm.
When the set value is made greater, the copy image posi-
tion for the copy paper moves backward. When the set
value is made greater, the copy image position for the copy
paper moves forward.
2) Press the scale onto the document alignment plate and set
it horizontally as shown below:
3) Set to "0" for the adjustment value A and B. Then make a
copy in the 70% and 141% mode.
4) Measure the distance from the paper lead edge to the copy
image lead edge of each copied papers.
L1: Distance (mm) from 141% copied paper lead edge to
the copy image lead edge
L2: Distance (mm) from 70% copied paper lead edge to
the copy image lead edge
10
20
30
mm
1/2mm
L1
Scale image lead edge
Enlargement copy (x 1.41)
9 – 15
www.freeservicemanuals.info
1/11/16
Published in Heiloo, Holland.
