Sharp AL-1043, Service Manual

Page: 72 / 126

AL-1551 ADJUSTMENTS 9-8
2. Copy density adjustment
A. Copy density adjustment timing
The copy density adjustment must be performed in the following cases:
• When maintenance is performed.
• When the developing bias/grid bias voltage is adjusted.
• When the optical section is cleaned.
• When a part in the optical section is replaced.
• When the optical section is disassembled.
• When the OPC drum 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.
B. Note for copy density adjustment
1) Arrangement before execution of the copy density adjustment
• Clean the optical section.
• Clean or replace the charger wire.
• Check that the voltage at the high voltage section and the developing
bias voltage are in the specified range.
C. Necessary tool for copy density adjustment
• One of the following test charts:
UKOG-0162FCZZ, UKOG-0089CSZZ, KODAK GRAY SCALE
• B4 (14" x 8 1/2") white paper
• The user program AE setting should be "3."
Test chart comparison table
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
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" x 8 1/2")
white paper on the test chart and close the document cover.
(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.
Set the exposure level to 3 for all adjustment. (Except for the auto
mode.)
UKOG-
0162FCZZ
DENSITY
No. 1 2 3 4 5 6 7 8 9 10 W
UKOG-
0089CSZZ
DENSITY
No. 0.1 0.2 0.3 0.5 1.9 0
KODAK
GRAY
SCALE 1 2 3 4 19 A
Auto Mode Brightness 1 step only
Manual Mode Brightness 5 steps. Adjustment of only the center
brightness is made.
Photo Mode Brightness 5 steps. Adjustment of only the center
brightness is made.
Manual T/S
mode Brightness 5 steps. Adjustment of only the center
brightness is made.
T/S Auto mode Brightness 1 step only
1 10 W 2 3 4 5 6 7 8 9
Adjustment
mode
Exposure mode
display lamp
Exposure
level
Sharp gray chart
adjustment level
Auto mode Auto lamp ON - "3" is slightly copied.
Manual mode Manual lamp ON 3 "3" is slightly copied.
Photo mode Photo lamp ON 3 "3" is slightly copied.
Manual T/S
mode Manual lamp/Photo
lamp ON 3 "4" is slightly copied.
Auto T/S mode Auto lamp/Photo
lamp ON
3 "4" is slightly copied.
Test chart
White paper
(1) (2)
(1) Mode select key/display
lamp
(2) Exposure level select
key/display lamp
, !"#$%