Copy Density Adjustment - Sharp SF-2014 Service Manual

3. COPY DENSITY ADJUSTMENT

(1) Copy density adjustment timing
The copy density adjustment must be performed in the following
cases:
When in maintenance.
When the high voltage unit output current or voltage is adjusted.
When the developing bias voltage is adjusted.
When the copy lamp is replaced.
When the optical section is cleaned.
When an optical part is replaced.
When the optical section is disassembled.
When the photoconductor drum is replaced.
When the developer is replaced.
When the AE sensor is replaced.
When the main control PWB is replaced.
When the EEPROM on the main control PWB is replaced.
When the memory trouble (U2) occurs.
When a part of the copy lamp control circuit is replaced.
When the AC power source PWB is replaced.
(2) Note for copy density adjustment
1) Necessary procedures before adjustment
Clean the optical section.
Clean the AE sensor.
Clean or replace the charger wire.
Check that the high voltage section voltage and the developing
bias voltage are in the specified range.
2) Note
The auto mode copy density adjustment must be performed after
the normal mode copy density adjustment. Never reverse the se-
quence.
(3) Necessary items for the copy density adjustment
Test chart
(Use one of the following three: UKOG-0162FCZZ, UKOG-
0089CSZZ, KODAK GRAY SCALE)
B4 (14 8 1/2 ) white paper
1 2 3 4 5
Test chart comparison
UKOG-0162FCZZ
1 2 3
DENSITY No.
UKOG-0089CSZZ
0.1 0.2
DENSITY No.
KODAK GRAY
1
SCALE
6 7 8 9 10
4 5 6 7 8 9 10
0.3 0.5 1.9
2 3 4 19
SHARP CORPORATION
MADE IN JAPAN
(4) Copy density adjustment mode
The copy density adjustment must be performed in the following five
mode:
Copy density adjustment mode
Original Normal mode Non-toner-save mode
table copy
mode
Photo mode
Auto mode
SPF copy Normal mode Non-toner-save mode Set to the
mode
Photo mode
Auto mode
(5) Copy density adjustment procedure
The copy density is adjusted by using Simulations 46 to change the
exposure level and the copy lamp voltage in each copy mode.
The copy density adjustment must be performed in the five modes.
To select each mode, use the copy mode select key.
In the SF-2214, copy density adjustment in the SPF copy mode is
also performed.
A. Test chart (UK0G-0162FCZZ) setting
1) Set the test chart and B4 (14
table as shown below.
The sensing area of the AE sensor is about 120 mm wide from
the rear frame side edge on the original table glass. Place the
white paper on that area, but keep the test chart away from that
area.
W
2) Close the document cover.
3) Execute Sim 47.
4) Cancel the Sim 47 after off the copy lamp.
B. Normal copy mode (Non-toner-save mode) copy
W
density adjustment
1) Enter the simulations 46-1 mode.
0
2) Set the adjustment mode to the normal copy mode (Non-toner-
save mode).
A
(Press the copy mode select key to light the normal copy mode
lamp.)
Copy mode lamp
Copy density display lamp
1
Lighting
Copy mode
select key
7 – 26
Toner save mode
Non-toner-save mode
Non-toner-save mode
Toner save mode
copy mode in
Toner save mode
the original
Non-toner-save mode
table copy
Non-toner-save mode
mode.
Toner save mode
8 1/2 ) white paper on the original
White paper 120mm
Test chart
Front side
122% A4
115% B5
2 3 4 5
100%
81% B4
70% B4
Copy density
adjustment key
Exposure
Sim No
level
1 5 46-1
1 5
1 5
1 5
1 5
51-6
Copy sheet display
B4
A4
%
A4
B5