2.5.3 Replacing the transfer entrance guide mylar
PM cycle: Replace every 800K
1. Measure the length between the leading edge of
the mylar and the corona unit casing as shown.
2. Replace the mylar and its bracket with new ones
(2 pan head screws).
3. Loosen the 2 flat head screws (mylar position
fixing screws) and turn the adjusting knobs so that
the length between the mylar and corona unit
casing becomes the same as the old one’s.
NOTE
The clearance between the mylar and OPC belt is
1.45 ± 0.1 mm when fitted to the main body. Note
that transport trouble, irregular transfer, etc. may
occur when the value changes.
4. If the whole T/S corona unit is replaced, adjust the
mylar position as follows:
(1) Loosen the 2 flat head screws (mylar
position fixing screws) and install the T/S
corona unit in the machine.
(2) Using the tracking motor ON key on the
service tool [5-06], move down the front
side of the tracking rollers. The OPC
surface comes close to the leading edge of
the transfer entrance guide mylar.
(3) Turn the front side of the adjusting knob
so that the leading edge of the mylar is just
in contact with the OPC surface.
(4) Remove the T/S corona unit.
(5) Turn the rear side of the adjusting knob
to level the front and rear of the leading
edge of the mylar. To do so, refer to the
edge of the corona unit casing as shown.
(6) Turn the front and rear adjusting knobs
28 notches (2 turns) and 3 notches counter
clockwise. Then, turn them 2 notches
clockwise and tighten the mylar position
fixing screws. (One notch turn of the knob
moves the mylar 0.05 mm.)
NOTE
If the mylar position is not proper, an insufficient
image transfer may occur on the leading edge of
copies (blank or faint image).
Measuring
Adjusting knob
OPC belt
Front adjusting
knob
Rear adjusting knob
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