Sharp AR-F152, Service Manual

Page: 85 / 170

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.
●
For the manual paper feed, change the manual paper feed ad-
justment mode and perform the similar procedures.
●
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:
●
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 develop-
ing 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
″ ×
8 1/2
″
) white paper
●
The user program AE setting should be “3.”
Test chart comparison table
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
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
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
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.
(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.)
Adjustment
mode
Exposure mode
display lamp
Ex-
posure
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.
1 10 W 2 3 4 5 6 7 8 9
Test chart
White paper
(1) (2)
(1) Mode select key/display
lamp
(2) Exposure level select
key/display lamp
AR-F152
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