MX-1800N (serv.man14). Section 6 - Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 3

MX-1800N  ADJUSTMENTS  6 – 3

4) Push the developing doctor in the arrow direction, and tighten

the fixing screw of the developing doctor. (Perform the similar
procedure for the front frame and the rear frame.)

5) Check that the doctor gaps at two positions in 40mm – 70mm

from the both sides of the developing doctor are in the range of
0.40 

± 0.05mm.

* When inserting a thickness gauge, be careful not to scratch the

developing doctor and the developing roller.

 

This adjustment must be executed in the following cases:
* When the developing unit is disassembled.
* When the print image density is low.
* When there is a blur on the print image.
* When there is unevenness in the print image density.
* There is abnormally much toner dispersion.
1) Remove the developing doctor cover, and place the develop-

ing unit on a flat surface.

2) Attach a thread to a needle or a pin.
3) Hold the thread and bring the needle near the developing

roller. (Do not use a paper clip because it will not provide a cor-
rect position.)

4) Mark the developing roller surface on the extension line of the

needle with the needle at 2 – 3mm from the developing roller
surface. (Never touch the needle tip with the developing roller.)

5)

Measure the distance between the marking position and posi-
tion A of the developing unit frame, and check that it is 37.8 

±

0.5mm.
If the distance is not within the above range, adjust the devel-
oping roller main pole position in the following procedures.

6)

Remove the developing unit front cover, loosen the fixing
screw of the developing roller main pole adjustment plate, and
move the adjustment plate in the arrow direction to adjust.

Repeat procedures 3) – 6) until the developing roller main pole
position comes to the specified range.

7)

After completion of the adjustment of the developing roller
main pole position, fix the developing roller main pole adjust-
ment plate with the fixing screw.

 

This adjustment must be executed in the following cases:
* When developer is replaced.

NOTE: Be sure to execute this adjustment only when developer is

replaced. Never execute it in the other cases.

㨪3mm