Sharp AR-651 (serv.man4) Service Manual ▷ View online
3 - 35
AR-651/810 ADJUSTMENT
3. 9. Adjustment of Fuser Unit
3. 9. 1. Adjustment of fuser roller pressure
Normally, the heat roller pressure need not be adjusted. However, it must be carried out when wrinkles
frequently appear on copies made on plain paper.
<Procedure>
(1) Open the RADF and make a copy with A3/LD size (solid copy).
(2) Turn the power OFF after copying is finished.
(3) Open the front cover quickly, and pull out the transfer/transport unit.
(4) Insert the copy made in (1) into the fuser inlet guide with the image side facing down while turning the
jam release lever CCW until the center of the copy paper is nipped by the heat roller.
(5) Leave the copy paper for about 20 seconds, and then take it out by quickly turning the jam release
lever CCW again.
(6) Measure the width of the area nipped by the heat and pressure rollers at the front and the rear.
R
F
Nipped area
Front
Rear
Copy paper(solid black)
(7) If |F-R| >
= 0.5mm, lift up the upper separation finger unit and loosen the fixing screw of the pressure
spring on the side with the wider nip width. One half turn corresponds to narrowing the nipped section by
about 0.5mm.
(8) If |F-R|<0.5mm, the adjustment is completed. Close the RADF and make five blank copies with A3/
LD size to clean the heat and pressure rollers.
AR-651/810 ADJUSTMENT
3 - 36
3. 9. 3. Adjustment of fuser inlet guide
Check the gap between the fuser inlet guide and the press roller when the following troubles
occur:
• Stain on the paper back side
• Jam at the fuser entrance
• Paper wrinkling
(1) Move the screw fastening position of the inlet
guide towards the oblong hole, and adjust with
reference to the scale.
(2) Adjust the gap between the fuse inlet guide and
the pressure roller. (0.4 <
= gap < 1.7)
3. 9. 2. Setting of fuser roller temperature
The fuser has been set (heat roller surface temperature: 200°C, pressurizing pressure: 100 kg)
taking the fusing performance, wrinkling, curling and toner transfer deficiency at the leading/
trailing edges of the duplex print into consideration when our company recommended paper is
used. This is to allow the characteristics of the paper to be demonstrated in a well-balanced
manner. However, various types of paper are used in the field, and factors such as the paper
thickness and smoothness greatly effect the fusing performance, in particular. If the fusing
performance deteriorates while using a specific type of paper, deal with that by changing the fuser
roller temperature at the setting mode “08”.
Change the heat roller setting temperature in the setting mode (08-410, 411, 883). The default is “8” (200°C),
and can be changed within the range “8” to “10” (200°C to 206°C). Input the same value in 08-410, 411 and
883.
Note:
When a large value is set (to increase the temperature), the level of wrinkling, curling and toner transfer
deficiency at the leading/trailing edges of the duplex print tends to worsen.
Fuser inlet guide
Scale
(0.4
< =
Gap < 1.7)
Fuser inlet guide
Pressure roller
3 - 37
AR-651/810 ADJUSTMENT
3. 9. 4. High-fusing mode
When the fusing level needs to be raised, it can be set at the setting mode “08”.
(1) Level up at 1st printing
The level for the 1st printing is set at the “high-fusing mode 1 (08-434)”. The level is raised by delaying
the time for the 1st printing and extending the time to warm the fuser roller. At this code, the time to
delay is set.
(2) Level up at continuous printing
The level for the continuous printing is set at the “high-fusing mode 2 (08-433)”. The level is raised by
delaying the printing cycle and controlling not to lower the fuser roller temperature.
Note: (1) and (2) can be combined.
The above settings are reflected when the “Thick paper 2” is selected.
AR-651/810 ADJUSTMENT
3 - 38
3. 10. Adjustment of Exit/Reversal Unit
3. 10. 1. Adjustment of sideways deviation
at reverse discharging
When a paper sideways deviation occurs at
reverse discharging, the transport guide position
is adjusted through the following procedure.
(1) Open the exit side door.
(2) Loosen 6 screws fixing the transport guide.
(3) Remove 2 screws, and take off the plate.
(4) Set the plate lengthwise, and fix it again with
2 screws after adjusting the plate installing
position depending on the paper deviation
amount.
(5) Remove 2 screws, and take off the plate with the latch holder.
(6) Turn the latch holder to the opposite direction, and install it to the plate.
(7) Turn the plate upside down (with the long hole upside), and install it again with 2 screws after
adjusting the same amount as did in the above (4).
Click on the first or last page to see other AR-651 (serv.man4) service manuals if exist.