Ricoh A151, Field Service Manual

Page: 153 / 397

6.10.1 Charge Corona Current Adjustment (SP9-2)
– Wire Height Adjustment –
NOTE: If the copy image is uneven from side-to-side in black solid areas
after the front end block of the charge corona unit is replaced, check
and adjust the wire height as follows:
1. Attach the drum shaft and drum shoe to the drum unit and install the
drum unit in the machine. (See Drum Current Adjustment Preparation.)
2. Slide the drum shoe [A] to the rear limit [X] as shown.
3. Position the drum shoe so that the axis of the current detection plate [B]
is aligned with the charge corona wires as shown.
4. Reinstall the charge corona unit on the drum unit.
5. Select the dc 200
µ
A range on the digital multimeter [C].
6. Turn on the main switch and close the front cover safety switch.
7. Turn on the charge corona using SP9-2.
8. Note the reading. (Wait at least 30 seconds for the current to stabilize.)
9. 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 8.
10. Adjust the front corona wire height by turning the adjusting screw [D] if
the two readings are different.
11. Repeat steps 2 to 10 until the difference between the front and rear
reading is no more than 4%.
[Y] [X]
≈
50 mm
≈
40 mm
[A]
[C]
[D]
[B]
RE
P
L
ACE
M
E
NT
AND
ADJUS
T
M
E
N
T
FSM 5-57 A151/A152