B. Image Position Adjustment - Sharp AR-168S Service Manual

2) Set the copy magnification ratio to 100%.
3) Make a copy on A4 or 81/2" x 11" paper.
4) Measure the length of the copied scale image.
5) Calculate the sub scanning direction copy magnification ratio
using the formula below.
Copy image dimensions
=
Original dimension
mm
10 20 100 110
1/2mm
mm
10 20 100 110
1/2mm
Reference Comparison point
6) Check that the actual copy magnification ratio is within the
specified range. (100 ± 1.0%).
If it is not within the specified range, perform the following
procedures.
7) Execute TC 48-01 to select the sub scanning direction copy
magnification ratio adjustment mode.
To select the adjustment mode, use the [ / ] key. (SCAN mode
lamp ON)
8) Enter the new set value of sub scanning direction copy
magnification ratio with the copy quantity set key, and press the
[START] key.
Repeat procedures 1) - 8) until the sub scanning direction actual copy
magnification ratio in 100% copying is within the specified range.
When the set value is changed by 1, the magnification ration is
changed by 0.1%.

B. Image position adjustment

The employed test commands and the contents are as follows:
Display
Mode
item
Print start position TRAY1
(Main cassette paper
feed)
(*) Print start position TRAY2
(2nd cassette paper
feed)
Print start position MFT
(Manual paper feed)
Image lead edge void DEN-A
amount
Image scan start RRC-A
position
Image rear edge void DEN-B
amount
X 100 (%)
110
Original (Scale)
HARDDENCD
STAINLESS
JAPAN
150
120 130 140
Shizuoka
Paper feed
HARDDENCD
STAINLESS direction
JAPAN
150
120 130 140
Shizuoka
Copy
Default LED
50 COPY mode lamp
Main cassette
lamp
50 COPY mode lamp
2nd cassette lamp
50 COPY mode lamp
Manual feed lamp
50 PRINT mode lamp
50 SCAN mode lamp
50 COPY mode lamp
PRINT mode lamp
SCAN mode lamp
AR-168S/168D ADJUSTMENTS 9 - 2
Mode
Print center offset
(Main cassette paper
feed)
(*) Print center offset
(2nd cassette paper
feed)
Print center offset
(Manual paper feed)
2nd print center
offset (Main cassette
paper feed)
The modes can be selected by pressing [ / ] key.
(*): Support for the installation models. For non-installation models,
skip.
* In the 2nd print center offset adjustment, print is made forcibly as
1to2/Long Edge from OC regardless of duplex setting.
(1) Lead edge adjustment
1) Set a scale to the center of the paper lead edge guide as shown
below, and cover it with B4 or 8 1/2" x 14" paper or OC cover.
2) Execute TC 50 - 01
3) Set the print start position (A: COPY mode lamp ON), the lead
TC
edge void amount (B: PRINT mode lamp ON), the scan start posi-
tion (C: SCAN mode lamp) to 1, and make a copy of the scale at
100%.
4) Measure the image loss (Rmm) of the scale.
Set C = 10 x R (mm). (Example: Set to 40.)
When the value of C is increased by 10, the image loss is
decreased by 1mm. (Default: 50)
5) Measure the distance (Hmm) from the paper lead edge to the
50-01
image print start position.
Set A = 10 x H (mm). (Example: Set to 50.)
When the value of A is increased by 10, the image lead edge is
moved to the paper lead edge by 1mm. (Default: 50).
6) Set the lead edge void amount to B = 50 (2.5mm). (Default: 50)
When the value of B is increased by 10, the void is extended by
about 0.1mm. (For 25 or less, however, the void amount is
regarded as 0.)
* The SFP adjustment is made by adjusting the SPF image scan start
position after OC adjustment.
Display
Default LED
item
TRAY1 50 COPY mode lamp
Main cassette lamp
TRAY2 50 COPY mode lamp
2nd cassette lamp
MFT 50 COPY mode lamp
Manual feed lamp
SIDE2 50 PRINT mode lamp
Main cassette lamp
TC
50-10