Read Sharp AR-M351N / AR-M451N (serv.man4) Service Manual online
AR-M351N/M451N ADJUSTMENTS 8 - 1
[8] ADJUSTMENTS
1. Process section
A. Doctor gap adjustment
This adjustment is performed in the following cases:
• When developer is scattered.
• When an uneven image is produced.
1) Remove the developer cartridge and the developing unit from
the machine.
2) Remove the DV cover and the developer from the developing
unit.
3) Remove the DVR cover, the DVF handle, the idle correction
plate assembly, and the HG gear 22T, insert a thickness
gauge (0.46mm) as shown in the figure below, and check that
the clearance is within the specified range.
gauge (0.46mm) as shown in the figure below, and check that
the clearance is within the specified range.
If the clearance is not within the specified range, adjust the doctor
gap in the following procedures.
gap in the following procedures.
4) Loosen the developing doctor fixing screw A.
5) Insert the thickness gauge (0.46mm) again as shown in the
figure below.
6) Push the developing doctor in the arrow direction and tighten
the fixing screw.
7) Check the developing doctor gap. If the clearance is within the
specified range, fix the screw with screw lock.
8) After completion of the job, apply screw lock.
<Adjustment specification>
B. MG roller main pole position adjustment
This adjustment is performed in the following cases:
• When developer is scattered.
• When an uneven image is produced.
1) Remove the developer cartridge and the developing unit from
the machine.
2) Remove the DV cover and the developer from the developing
unit.
3) Remove the DVF handle and put the developing unit on a flat
surface.
4) Bind a string to a needle.
5) Hold the string and move the needle toward the MG roller.
(Since the MG roller diameter is small, use of a clip cannot
make an accurate adjustment.)
make an accurate adjustment.)
6) With the needle tip 2 - 3 mm apart from the MG roller surface,
mark the point on the MG roller in the elongated line of the
needle.
(Keep the needle and the MG roller apart from each other.)
needle.
(Keep the needle and the MG roller apart from each other.)
7) Measure the distance from the marking position to the P sur-
face of the developing unit, and check that the distance is
within the specified range.
within the specified range.
If the distance is not within the specified range, perform the adjust-
ment in the following procedures.
ment in the following procedures.
8) Loosen the fixing screw of the main pole fixing plate.
No.
Section
Adjustment item
1
Process
section
section
A Doctor gap adjustment
B MG roller main pole position adjustment
C High voltage output adjustment
2
Image
check,
adjustment
check,
adjustment
A Adjustments
on the engine
side
side
<1> LSU right angle
adjustment
<2> Print off-center
adjustment
<3> Each tray resist
amount setting
<4> Self print lead edge
adjustment
<5> Front/rear and left/right
void amount setting
B Adjustment
on the
scanner side
scanner side
<1> OC scan distortion
adjustment
<2> SPF height adjustment
<3> SPF scan distortion
<3> SPF scan distortion
adjustment
<4> OC scan magnification
ratio adjustment
<5> SPF scan
magnification ratio
<6> OC scan lead edge
adjustment
<7> SPF scan lead edge
adjustment
<8> Original off-center
adjustment
3
Scanner
section
section
A OC scan distortion adjustment
B Vertical image distortion balance
adjustment
C Vertical image distortion balance
adjustment
D Vertical (sub scanning direction) distortion
adjustment
E Height adjustment of original detection light
emitting unit
F Original size detection photo sensor check
G Original size detection photo sensor
adjustment
H Image density adjustment
I
DSPF width detection adjustment
Specification
Ambient
temperature
Both sides
(Position at 20 - 50mm)
(Position at 20 - 50mm)
0.45±0.03mm
5 - 30°C
Center
0.45 - 0.60mm
20mm
20mm
Click on the first or last page to see other AR-M351N / AR-M451N (serv.man4) service manuals if exist.