Specifications

6.11.1CHARGE CORONA CURRENT ADJUSTMENT (SP Mode #9-2 )
- Wire Height Adjustment -
NOTE: If the OS-A3 test chart gray scale shows an uneven image after the
front end block of the charge corona unit is replaced, check and
adjust the wire height as follows:
1. Set the drum shaft and drum shoe on the drum unit and install the drum
unit in the machine. (See Drum Current Adjustment Preparation.)
2. Slide the the drum shoe [A] to the rear limit [X] as shown.
3. Position the drum shoe so that the axis of the current sensing plate [B] is
aligned with the charge corona wire as shown.
4. Reinstall the charge corona unit on the drum unit.
5. Select the dc 200 µA range on the digital multimeter [C].
6. Using SP mode #9–2, turn on the main switch, front door safety switch
and the charge corona .
7. Note the reading. (Wait at least 30 seconds for the current to stabilize.)
8. Press the Clear/Stop key to turn off the charge corona, then move the
drum shoe to the front limit [Y] as shown and repeat steps 3 to 7.
9. Adjust the front corona wire height by turning the adjusting screw [D] if
the two readings are different.
10. Repeat steps 2 to 9 until the difference between the front and rear read-
ings is no more than 4%.
[B]
[A]
[C]
[B]
[Y]
[X]
[D]
[A]
[C]
1 December 1990
5-74