[7] ADJUSTMENTS
1. Developing Unit
(1) Clearance Adjustment of Developing Doctor
Blade
1 Remove the 4 screws and the 5-pin connector which connect
the developer tank to the toner hopper, and pull out the
developer tank.
2 Loosen 4 setscrews A of the developing doctor blade.
(2 setscrews on the rear frame side and 2 on the front frame
side).
3 Insert the feeler gauges into the clearance between the develop-
ing doctor blade and the magnet roller at the points 50-80 mm
away from both ends.
4 While pressing down the developing doctor blade in the arrow
direction, tighten the 4 setscrews to secure the developing doc-
tor blade.
5 Check that the clearance between the developing doctor blade
and the magnet roller is 0.525±0.03 mm at the points 50-80 mm
away from the doctor blade ends.
Caution: Do not damage the developing doctor blade or the
magnet roller during insertion of the feeler gauge.
Tool: UKOGM0075CSZZ (Feeler gauge)
(2) Position Adjustment of Developing Magnet
Roller Main Pole
1 Remove the 4 screws and the 5-pin connector which connect
the developer tank to the toner hopper and remove the toner
hopper. Put developing unit on a flat surface.
2 Thread a needle or pin as shown in the figure on the right.
3 While holding the thread, bring the needle near the magnet
roller. (Do not use a clip because it will not provide an accurate
position of the main pole).
4 Use a pen to put a mark on the point of the magnet roller
surface to which the needle is attracted.
5 Measure the distance from the mark to the reference plane on
which the developer tank is placed.
This distance must be 17.7
mm.
If not so, loosen setscrew A of the main pole adjusting plate and
move the adjusting plate in the arrow direction to obtain the
proper distance.
0.525
0.03
0.03
A A
50mm
50mm
30mm
30mm
A
17.7mm
17.7mm
7 – 1
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