Adjustment - Sharp AR-BC260 Service Manual

ADJ 10 Copy image position/image
loss/void area adjustment
This adjustment must be performed in the following cases:
• When the scanner (reading) section is disassembled.
• When the scanner (reading) unit is replaced.
• When the resist roller section is disassembled.
• When a U2 trouble occurs.
• When the MFP main PWB is replaced.
• When the EEPROM of the MFP main PWB is replaced.
This adjustment uses SIM 50-2 and SIM 50-1.
The above two simulations are used in the following manner.
SIM 50-2: Rough adjustment
SIM 50-1: Fine adjustment
If the desired value is obtained by SIM 50-2, there is no need to
perform SIM 50-1.
(Adjustment item)
No. Adjustment item
1 Lead edge image loss
2 Lead edge void area
3 Rear edge void area
4 Image reference position
5 Paper timing
6 Distance between image lead
edge position and scale of
10mm x 10
7 Distance between paper lead
edge and image lead edge x 10
Adjustment items 1 to 3 can be adjusted either with SIM 50-1 or
with SIM 50-2.
The adjustment values 6 and 7 will affect the adjustment items 4
and 5 automatically.
Therefore, adjusting the items 6 and 7 will lead to the same result
as adjusting the items 4 and 5 directly.
1) Place a scale on the original table as shown below.
Note that the scale must be placed in parallel with the scan-
ning direction and that the scale lead edge must be in close
contact with the original guide plate.
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
2) Enter the SIM 50-2 mode.
3) Set IMAGE LOSS and DEN-A to "20".
4) Set all the set items of L1 and L2 to "0".
5) Make a copy at 400%. (Original table mode)
SIM 50-2 SIM 50-1

Adjustment

set item set item value
IMAGE IMAGE 4.0 ±
LOSS LOSS 1.0mm
DEN-A DEN-A 4.0 ±
1.0mm
DEN-B DEN-B 4.0 ±
1.0mm
RRC-A
RRC-B
L1
L2
AR-BC260 SETTING AND ADJUSTMENTS 8 - 20
6) Measure the copied image dimensions X and Y.
X: Distance between the copy image lead edge and the scale
of 10mm.
Y: Distance between the paper lead edge and the copy image
lead edge.
X
Paper lead
edge
10
Y
7) Multiply X, Y, and Z (unit: mm) by 10 to obtain L1, L2 respec-
tively. Enter the values of L1, L2, and L3.
L1 = X x 10
L2 = Y x 10
8) Cancel the simulation, make a copy, and check that the lead
edge image loss and void area are within the specified range
shown below.
Lead edge image loss: 4.0 ± 1.0mm
Lead edge void area: 4.0 ± 1.0mm
If the above specifications are not satisfied, perform the following
procedures.
9) Enter the SIM 50-1 mode.
10) Set a scale in the same manner as procedure 3), and make a
copy at 50% and at 400% in the original table mode.
11) Measure the distance between the paper lead edge and the
copy image lead edge of 50% copy and of 400% copy.
12) Check that there is no difference between the above distance
of 50% copy and that of 400% copy.
If there is a difference of 1.5mm or above, change the adjust-
ment value of RRC-A.
Repeat procedures 10) to 12) until the above specification is satis-
fied.
13) If the lead edge void area is not within the specified range,
change the DEN-A value.
14) If the lead edge void area is not within the specified range,
change the IMAGE LOSS value.
15) If the rear edge void area is not within the specified range,
change the DEN-B value.
Image loss
Lead edge void area
50
20 30 40
400% enlarged copy
Rear edge void area