Adjustment Of Copy Density; When Must The Copy Density Be Adjusted; Notes On Adjustment Of Copy Density; Procedure For Copy Density Adjustment - Sharp SF-2025 Service Manual

5 Measure the distance from the paper end to image(scale) end of
the 200% and 100% copy, and using the scrol display key and
the ten keys, type the L1 and L2 values. Type all three digits.
The RRC-A and RRC-B values of Simulation 50-01 are automat-
ically calculated and stored in memory.
Input Procedure
Assuming the L1 is 25.4 mm and L2 is 15.0 mm:
After checking that the last digit of the magnification indicator is
2 → → →
A, 5 4
PSW .
6 Adjust and check the deviation, image loss and void area in the
same manner as in case of Simulation 50-01.

4. Adjustment of Copy Density

1. When must the copy density be adjusted ?

•
When doing maintenance;
•
After adjusting the output current of the main charger and transfer
charger, the bias voltage of the separation charger and the grid
voltage (After replacing the charger unit and/or the high voltage
unit);
•
After adjusting the developing bias;
•
After replacing parts in the AC PWB unit;
•
After replacing the automatic exposure sensor;
•
After replacing the copy lamp;
•
After replacing the optical unit;
•
After disassembling, repairing and/or adjusting the optical unit;
•
After moving the exposure control plate;
•
After replacing the drum;
•
After replacing the main substrate

2. Notes on adjustment of copy density

Before adjusting the copy density, do the followings:
1 Clean the optical system(original glass plate, lens, mirror, copy
lamp, reflector).
2 Clean the automatic exposure sensor (clean the surface of the
photosensor with a soft cloth soaked with alcohol or water).
(Note: The use of dry cloth will cause dust adhesion on the sur-
face of the sensor due to static electricity).
3 Clean the (transfer and separation) charger wire and the screen
grid.
4 Clean the blank lamp and the separation lamp around the drum
holder unit.
5 Clean the drum cleaning blade. (After cleaning, always apply pow-
der on the blade).
Note: Perform the manual-exposure density adjustment first, and
then perform the auto-exposure density adjustment.
•
Note: This machine automatically performs the correction to
the optical system dirt.
When Simulation 46-01 is performed, each mode cor-
rection is initialized. When performing Simulation 46-01,
perform the adjustments of all modes.
→ → → 0 →
1 5
Paper end

3. Procedure for copy density adjustment

(1) Initial setting of auto-exposure density level
Enter the auto-exposure copy (AUTO) mode, open the front door and
press down the mode exchange key for at least 3 sec. The density
level LED is lit. Then set the density to "3" with [LIGHT] and [DARK]
keys.
1
(2) Initial setting of TSM mode
Enter the auto-exposure copy (PHOTO) mode, open the front door
and press down the mode exchange key for at least 3 sec. The
density level LED is lit. Then set the density to "1" with [LIGHT] and
[DARK] keys.
7 – 17
Void area
1~4mm
Scale image
50
10 20 30 40
Solid edge
Image loss
0~4mm
Full-size(100%) copy
Copy density
Auto density
Manual density
Photo
2 3 4 5
LIGHT DARK