Service manual

AL-2041 ADJUSTMENTS 9 - 4
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 devel-
oping 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 pro-
vided in the image process LSI is used.
List of the adjustment modes
E. Copy density adjustment procedure
Use SIM 46-1 to set the copy density for each copy mode.
For selection of modes, use the [Exposure mode selector] key.
(1) Test chart (UKOG-0162FCZZ) setting
1) Place the test chart so that its edge is aligned with the A4 (Let-
ter) reference line on the document table. Then place a A4
(14" x 8 1/2") white paper on the test chart and close the docu-
ment cover.
(2) Perform the adjustment in each mode.
1) Execute SIM 46-01 (300dpi). To adjust in 600dpi, execute SIM
46-02.
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.
12345678910W
UKOG-
0089CSZZ
DENSITY
No.
0.1 0.2 0.3 0.5 1.9 0
KODAK
GRAY
SCALE
123419A
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 23456789
Adjustment
mode
Exposure mode
display lamp
Sharp gray chart
adjustment level
Auto mode Auto lamp ON "3" is slightly copied.
Manual mode Manual lamp ON "3" is slightly copied.
Photo mode Photo lamp ON "3" is slightly copied.
Manual T/S
mode
Manual lamp/Photo lamp ON "3" is slightly copied.
Auto T/S
mode
Auto lamp/Photo lamp ON "3" is slightly copied.
Test chart
White paper
(1) (2)
Exposure mode select key/display lamp
[Exposure mode selector] key/
display lamp
(1)
(2)