Copy Density Adjustment - Toshiba e-STUDIO203S Service Manual

(Example)
Distance from the paper lead edge
to the image lead edge, H = 5mm
5mm
10mm
(2) Image rear edge void amount adjustment
1) Set a scale to the rear edge section of A4 or 11" x 8 1/2" paper
size as shown in the figure below, and cover it with B4 or 8 1/2"
x 14" paper.
B4 or 8 1/2" × 14" paper
2) Execute TC 50 - 01 to select the image rear edge void amount
adjustment mode.
The set adjustment value is displayed on the copy quantity dis-
play.
3) Make a copy and measure the void amount of image rear edge.
Void amount (Standard value: 2 - 3mm)
Scale image
4) If the measurement value is out of the specified range, change
the set value and repeat the adjustment procedure.
The default value is 50.
(3) Center offset adjustment
1) Set the self-made test chart for the center position adjustment
so that its center line is aligned with the center mark of the doc-
ument guide.
• Test chart for the center position adjustment.
Draw a line at the center of A4 or 8 1/2" x 11" paper in the paper
transport direction.
Image loss, R = 4mm
A4 size rear edge
Paper rear edge
e-STUDIO203S/203SD ADJUSTMENTS 9 - 3
Document guide
2) Execute TC 50-10 to select the print center offset (cassette
paper feed) adjustment mode.
The set adjustment value is displayed on the copy quantity dis-
play.
3) Make a copy and check that the copied center line is properly
positioned.
The standard value is 0 ±2mm from the paper center.
(Copy A)
(Copy B)
(Paper feed direction)
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
adjustment 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 docu-
ment 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 devel-
oping bias voltage are in the specified range.
Center
Copy paper
(A4 or 8 1/2" × 11")
2.0mm or less
Copy image
Copy paper
Shift
folding line
2.0mm or less
Copy image
Copy paper
Shift
folding line