Read Sharp AL-1622 (serv.man10) Service Manual online
AL-1611/AL-1622
ADJUSTMENTS
7 – 2
(2) Grid bias voltage adjustment
Note: Use a digital multi-meter with an internal resistance of 10M
Ω
or
more.
1) Set the digital multi-meter range to DC700V.
2) Put the test rod of the digital multi-meter on the grid bias voltage
output check pin.
3) Turn on the power.
4) Adjust the adjustment volumes (VR51, VR52) so that the output
voltage is within the specified range. (The voltage is outputted in the
grid bias high output mode during warming up, and in the grid bias
grid bias high output mode during warming up, and in the grid bias
low output mode after completion of warming up.)
<Adjustment specification>
B. Mechanism section
(1) Image lead edge position adjustment (SIM 50-1)
a. OC image lead edge position adjustment
Note: In advance to this adjustment, the sub scanning magnification
ratio adjustment must be performed.
1) Set a scale on the OC table as shown below.
2) Make a copy.
3) Check the copy output. If necessary, perform the following adjust-
ment procedures.
4) Execute SIM 50-1.
5) Set the OC lead edge position set value (Exposure display <AUTO>
ON) to “99.”
The OC image scanning start position is shifted inside the docu-
ment edge.
ment edge.
6) Set the main cassette lead edge void adjustment value (Exposure
display <PHOTO> ON)
*
to “1.”
The lead edge void becomes the minimum.
7) Set the print start position value (Exposure display <EXP1> ON) to
“99” and make a copy.
The print start position is shifted inside the document edge.
The print start position is shifted inside the document edge.
8) Measure the image loss R of the copied image. Enter the set value
of the image scanning lead edge position (Exposure display
<AUTO> ON) again.
• 1 step of the set value corresponds to about 0.127mm shift.
• Calculate the set value from the formula below.
99 - R/0.127 (mm) = Image loss set value <R: Image loss measure-
ment value (mm)>
ment value (mm)>
Example: 99 - 4/0.127 = 99 - 31.5 = about 67
Note: If the set value is not obtained from the above formula, per-
form the fine adjustment.
Mode
Specification
Grid bias LOW
DC-400
m
20V
VR52
Grid bias HIGH
DC-525
m
10V
VR51
5
10
5mm
4mm
*
The dimension varies depending on the model.
10
5mm
0mm
5
*
The scanning edge is set.
(A line may be printed by scanning the document edge.)
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