Sharp AR-280 Service Manual page 118

Note (Note) It must be set to the default 3.
44 - 2
Purpose Adjustment
Function Used to adjust the sensitivity (gain) of the OPC drum
(Purpose) mark sensor and the image density sensor.
Section Image process
(Photoconductor/
Developping/Transfer/
Cleaning)
Item Operation
Operation/ When the [EXECUTE] key is pressed, it is highlighted
Procedure and the main motor rotates to start the drum marking
sensor and the image density sensor gain adjustment.
(The adjustment is automatically performed.)
After completion of the adjustment, the [EXECUTE] key returns to the
normal display and the main motor stops.
At that time, the gain level of each sensor is displayed.
If the adjustment is not completed properly, the ERROR display is
shown.
DMLED: Drum marking sensor gain adjustment value
PCLED: Image density sensor gain adjustment value
DRUM: Kinds of drums
0: Others
1: AR330DR/AR336DR/AR336DM/ARdR23; 10mm
2: AR330DM/ARDR17; 3 x 4 x 3mm
3: AR400DR/AR400DM; 15mm
5: AR500DR/AR500DM/ARDR25; 5mm
As other models except AR-501/505/507 do not
recognize 5mm marking, "0" is displayed at that
time.
(AR-405/407/501/505/507)
(AR-250/280/281/285/286/287/335/336/337)
7/13/2000
Photo conductor
7 – 37
44 - 4
Purpose Setting
Function Used to set the target image (reference) density level in
(Purpose) the developing bias voltage correction.
Section Image process (Photoconductor/Developping/Transfer/
Cleaning)
Item Data
Operation/ 1. Enter the set value (38) with the 10-key.
Procedure
2. Press the [OK] key. (The value entered in procedure
1 is set.)
Set value: 36 (AR-501/505/507), 38 (Other models)
Note It must be set to 36 for AR-501/505 or 38 for other
models.
44 - 5
Purpose Setting
Function Used to set various parameters (main charger grid volt-
(Purpose) age, laser beam power, correction start developing bias
voltage) in developing bias correction.
Section Image process (Photoconductor/Developing/Transfer/
Cleaning)
Item Operation
Operation/ 1. Select the parameter mode with [­], [¯] keys.
Procedure
2. Enter the parameter with the 10-key.
3. Press the [OK] key. (The value entered in procedure 2 is set.)
GRID BIAS VOL: Reference charging voltage level in patch
forming (AR-501/505/507; 360), other
models; 380) (Set value)
DEVE BIAS VOL : Reference developing bias voltage level in
patch forming (210) (Set value)
LASER DUTY: Laser duty level in patch forming (255)
Note Be sure to set to the specified value. If not, the print im-
age density may be disturbed.
44 - 9
Purpose Operation data output/Check (Display/Print)
Function Used to check the data on the result of the image form-
(Purpose) ing section correction (process correction) (the cor-
rected main charger grid voltage in each print mode,
developing bias voltage, the laser power, etc.)
(This simulation allows to check whether the correction
is executed properly or not.)
Section Image process (Photoconductor/Developping/Transfer/
Cleaning)
Adjust/Setting data