Copy Density Adjustment; Test Chart - Sharp DM-1505 - B/W Laser Printer Service Manual

DM-1505
4) If the measured value is out of the specified range, change the set
value and repeat the adjustment procedure.
When the set value is increased by 1, the copy image is shifted by
0.1mm toward the rear frame.
G
For the manual paper feed, change the manual paper feed ad-
justment mode and perform the similar procedures.
G
Since the document center offset is automatically adjusted by
the CCD which scan the reference lines (F/R) on the back of
document guide, there is no need to adjust manually.

2. Copy density adjustment

A. Copy density adjustment timing
The copy density adjustment must be performed in the following cases:
G
When maintenance is performed.
G
When the developing bias/grid bias voltage is adjusted.
G
When the optical section is cleaned.
G
When a part in the optical section is replaced.
G
When the optical section is disassembled.
G
When the OPC drum is replaced.
G
When the main control PWB is replaced.
G
When the EEPROM on the main control PWB is replaced.
G
When the memory trouble (U2) occurs.
B. Note for copy density adjustment
1) Arrangement before execution of the copy density adjustment
G
Clean the optical section.
G
Clean or replace the charger wire.
G
Check that the voltage at the high voltage section and the develop-
ing bias voltage are in the specified range.
C. Necessary tool for copy density adjustment
G
One of the following test charts:
UKOG-0162FCZZ, UKOG-0089CSZZ, KODAK GRAY SCALE
G B4 (14" × 8 1/2") white paper
G
The user program AE setting should be "3."
1 2 3 4 5
Test chart comparison table
UKOG-
0162FCZZ 1 2 3
DENSITY No.
UKOG-
0089CSZZ 0.1 0.2
DENSITY No.
KODAK GRAY
1
SCALE
D. Features of copy density adjustment
For the copy density adjustment, the image data shift function provided
in the image process LSI is used.
List of the adjustment modes
Auto Mode Brightness 1 step only
Brightness 5 steps. Adjustment of only the
Manual Mode
center brightness is made.
Brightness 5 steps. Adjustment of only the
Photo Mode
center brightness is made.
Manual T/S Brightness 5 steps. Adjustment of only the
mode center brightness is made.
T/S Auto mode Brightness 1 step only
6 7 8 9 10
4 5 6 7 8 9 10 W
0.3 0.5 1.9
2 3 4 19
E. Copy density adjustment procedure
Use SIM 46-01 to set the copy density for each copy mode.
For selection of modes, use the copy mode select key.
(1) Test chart (UKOG-0162FCZZ) setting
1) Place the test chart so that its edge is aligned with the A4 (Letter)
reference line on the document table. Then place a B4 (14" × 8
1/2") white paper on the test chart and close the document cover.

Test chart

(2) Perform the adjustment in each mode.
1) Execute SIM 46-1.
2) Select the mode to be adjusted with the exposure mode select key.
W
Set the exposure level to 3 for all adjustment. (Except for the auto
mode.)
(1)
0
A
Adjustment Exposure mode
mode
Auto mode Auto lamp ON
Manual mode Manual lamp ON
Photo mode Photo lamp ON
Manual T/S Manual lamp/Photo
mode
Auto T/S Auto lamp/Photo
mode
manuals4you.com
8 – 8
White paper
(2)
(1) Mode select key/display
lamp
(2) Exposure level select
key/display lamp
Ex-
Sharp gray chart
posure
display lamp adjustment level
level
"3" is slightly
—
copied.
"3" is slightly
3
copied.
"3" is slightly
3
copied.
"4" is slightly
3
lamp ON copied.
"4" is slightly
3
lamp ON copied.