Copy Density Adjustment - Sharp SF-2014 Service Manual

Repeat procedures 1) to 8) until the horizontal copy magnifica-
tion ratio in the normal (100%) copy mode is within the specified
range. (SPF copy mode: Horizontal copy magnification ratio ad-
justment)
1) Set the copied scale image paper which was made in the
horizontal copy magnification ratio adjustment in the docu-
ment table copy mode so that the scale image is horizontal in
the SPF.
Note that the copy magnification ratio of the copied scale
image must be proper.
2) Set the copy magnification ratio to 100%.
3) Make a copy on A4 or 8 1/2" x 11" paper.
4) Measure the length of the copied scale image.
mm
1 0
1/2mm
mm
1 0
1/2mm
Reference
5) Calculate the horizontal copy magnification ratio.
Horizontal copy magnification ratio =
6) Check that the actual copy magnification ratio is within the
specified range (100 0.8%).
If it is out of the specified range, perform the following proce-
dures.
7) Execute simulations 48-3. (C
CB)
The set horizontal copy magnification ratio in the SPF copy
mode will be displayed in the COPIES SELECTED display.
8) Enter a new horizontal copy magnification ratio with the nu-
meric key and press PRINT button. The above procedure
changes the document feed speed of the SPF and the hori-
zontal copy magnification ratio.
When the copy magnification ratio is set to a larger value, the
actual copy magnification ratio becomes larger.
When the copy magnification ratio is set to a smaller value,
the actual copy magnification ratio becomes smaller.
Repeat procedures 1) to 8) until the horizontal copy magnifi-
cation ratio in the SPF copy mode is within the specified
range.
VII. Troubles caused by improper adjustment
2 0 100 110 120
2 0 100 110 120
Comparison point
Copy image size
x 100 (%)
Original size
0 0 C 48 CB
110
Original scale
HARDDENCD
STAINLESS
JAPAN
150
130 140
Shizuoka
HARDDENCD
STAINLESS
JAPAN
150
130 140
Shizuoka
Copy
(7) Uniformity adjustment
I. Summary
The uniformity adjustment is performed by changing the expo-
sure plate position attached to No.1 scanner unit.
The above procedure changes the balance of light quantity radi-
ated onto the document.
II. Purpose
3
The purpose of this adjustment is to have uniform copy density.
III. Note
When this adjustment is performed, the exposure will be
changed. Therefore, the copy density adjustment must be per-
formed after this adjustment. Also, this adjustment must be per-
formed always before the copy density adjustment.
IV. Cases when the adjustment is required
1) When the reflector is replaced.
2) When the copy lamp is replaced.
3) When the exposure adjustment plate is disassembled or re-
placed.
4) In maintenance
V. Necessary tools
* Screwdriver (+)
* A4 or 8 1/2" x 11" paper
* Half-tone paper of A4 or 8 1/2" x 11" or larger
7 – 18
Paper feed
direction