Sharp AR-651 Service Handbook page 94

(2) Operation
Connect the digital tester as described in (1) Preparation, and perform the following procedure to adjust the
outputs.
<Keys to press>
[0][5]
[POWER]
[Digital keys] : Enter the code.
[ST ART]
[Up] or [Down] : Adjust the value "YYY" to satisfy the following table.
: Adjusted value "YYY" is stored in the BC-RAM.
[SET]
or
[INTERRUPT]
Return to
the other adjustment
mode.
[POWER] OFF/ON : To exit the adjustment mode.
(3) Precautions
(a) Developer bias
Note for adjustment
Adjust the developer bias if fogging occurs over the entire image even though the main charger grid
voltage and toner density are appropriate. The developer bias can be adjusted at the setting mode (08-
861, 862, 863, 860, 859) (about 36V/10 steps), and the equivalent number of steps must be adjusted
for the main charger grid when adjusting the developer bias (08-865, 866, 867, 864, 871). However, the
following problems may occur if the developer bias is lowered too much:
• Image contrast becomes low.
• Image is patchy or blurred.
• The carrier in the developer material adheres to the photoconductive drum, causing scratches around
the cleaner.
AR-651/810 ADJUSTMENT
<Display>
100%
TEST MODE
100%
TEST MODE
YYY
Current set value
Code
Adjustment value
100%
TEST MODE
to enter
A
XXX
Main charger grid bias Developer bias
210
-733±5V
A
3 - 24
A3
A3
Code No.
205
-480±5V
A3