Service manual

AL-2041 ADJUSTMENTS 9 - 5
3) Make a copy.
Check the adjustment level (shown in the above table) of the
exposure test chart (Sharp Gray Scale).
(When too bright): Decrease the value displayed on the copy
quantity display.
(When too dark): Increase the value displayed on the copy quan-
tity display.
* The value can be set in the range of 1 - 99.
3. High voltage adjustment
A. Main charger (Grid bias)
Note:
• Use a digital multi meter with internal resistance of 10MΩ or
more measurement.
• After adjusting the grid LOW output, adjust the HIGH output. Do
not reverse the sequence.
Procedures
1) Set the digital multi meter range to DC700V.
2) Set the positive side of the test rod to the connector CN11-3
(GRID) of high voltage section of the power PWB and set the
negative side to the frame ground (power frame).
3) Execute SIM 8-2. (The main charger output is supplied for 30
sec in the grid voltage HIGH output mode.)
4) Adjust the control volume (VRG1) so that the output voltage is
580 ± 12V.
B. DV bias check
Procedures
1) Set the digital multi meter range to DC500V.
2) Set the positive side of the test rod to the connector CN-10-1
(DV BIAS) and set the negative side to the frame ground
(power frame).
3) Execute SIM 8-1 to output the developing bias for 30sec, and
check that the output is –400 ± 8V.
4. Duplex adjustment
A. Adjusting the paper reverse position in
memory for duplex copying
This step adjusts the front surface printing (odd-number pages of a
document set) in the S-D mode copying and the leading edge posi-
tion of an image on even-number pages in the D-S mode.
That is, it covers the adjustment of the second surface printing
mode (image loss at the front edge of an image) in which image
data is once stored in memory.
The image data is read, starting from its front end in the document
delivery direction (Reference direction of document setting in the
OC mode)and stored in memory.
This stored image data is printed starting at the printing start posi-
tion, in the order of last-stored data to the first-stored data.
In other words, the front edge image loss of the image can be
adjusted by changing the document read end position.
(Adjustment procedure)
1) Preparing test chart (Draw a scale at the rear end of one side of
a sheet of A4 white paper or letter paper)
Sharp Gray Scale adjustment level
Non toner
save
mode
Toner
save
mode
1 10 W 23456789
Slightly copied.
Not copied.
1 10 W 23456789
Slightly copied.
Not copied.
VRG1
Note: • A digital multi meter with internal resistance of 1GΩ must
be use for correct check.
• The adjustment volume is locked, and no adjustment can
be made.
VRDV
510