Sharp AR-121E Service Manual page 89

AL-1000/1010
(4) Image position adjustment
There are following five kinds of image position adjustments,
which are made by laser control except for the image scan start
position adjustment. For the adjustments, SIM 50 – 01 and SIM
50 – 10 are used.
No. Adjustment item
1 Print start position
2 Image lead edge void amount
3 Image scan start position
4 Image rear edge void amount
5 Center offset
To select the adjustment mode with SIM 50 – 01, use the copy
density select key.
The relationship between the adjustment modes and the light-
ing lamps are as shown in the table below.
Adjustment mode
Print start position
Image lead edge void amount
Image scan start position
Image rear edge void amount
To select the adjustment mode with SIM 50 – 10, use the copy
mode select key.
The relationship between the adjustment modes and the light-
ing
lamps are as shown in the table below.
Machine with the multi manual paper feed unit
Adjustment mode
Print center offset (cassette)
Print center offset (manual feed) Auto, Manual
Document center offset
Machine with the single manual paper feed unit
Print center offset (cassette)
Print center offset (manual feed) Auto
Document center offset
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" × 14" paper.
2) Execute SIM 50 – 01
3) Set the print start position (AE lamp ON) (A), the lead edge
void amount (TEXT lamp ON) (B), and the scan start posi-
tion (PHOTO lamp ON) (C) to 0, and make a copy of a scale
at 100%.
Simulation
50 – 01
50 – 01
50 – 01
50 – 01
50 – 10
Lighting lamp
Auto (AE) lamp
Manual (TEXT) lamp
Photo lamp
Auto, Manual, Photo
lamps
Lighting lamp
Auto, Cassette
Auto, Manual
Auto, Cassette
Auto, Manual
9-7
4) Measure the image loss amount (R mm) of the scale image.
Set C = 10 × R (mm). (Example: Set the value of C to 30.)
When the value of C is increased by 10, the image loss is
decreased by 1mm. (Default: 50)
5) Measure the distance (H mm) between the paper lead edge
and the image print start position.
Set A = 10 × H (mm). (Example: Set the value of A to 50.)
When the value of A is increased by 10, the image lead
edge is shifted to the paper lead edge by 1mm. (Default: 50)
6) Set the lead edge void amount to B = 50 (2.5mm).
When the value of B is increased by 10, the void amount is
increased by about 1mm. For 25 or less, however, the void
amount becomes zero. (Default: 50)
(Example)
Distance between paper lead
edge and image: H = 5mm
5mm
10mm
2. Image rear edge void amount adjustment
1) Set a scale to the rear edge section of A4 or 11" × 8 1/2"
paper size as shown in the figure below, and cover it with
B4 or 8 1/2" × 14" paper.
B4 or 8 1/2" × 14" paper
2) Execute SIM 50 – 01 to select the image rear edge void
amount adjustment mode.
The set adjustment value is displayed on the copy quantity
display.
3) Make a copy and measure the void amount of image rear
edge.
Void amount (Standard value: 2 – 3mm)
Scale image
Image loss:
R = 3mm
A4 size rear edge
Paper rear edge