Sharp AR-650 Service Handbook page 68

Sequence of Operation, Pattern 3
[0] [5]
[PWR]
1
[Digital Keys]: Enter code.
[START]
[Digital Keys]: Enter code
(value after hyphen).
Value after
hyphen (0, 1, 2)
[START]
Current
adjustment value
[Digital Keys]: Enter adjustment value "Z'Z'Z'".
[SET] or [INTERRUPT]: The "Z'Z'Z'" value after adjustment is recorded to NVM.
If you switch to
another adjustment
mode, go to
[0] [9]
: Exit adjustment mode.
Note: The "adjustment value" indicates the output voltage of the DA converters (IC47, 148)
on the logic PC board, and conforms to the following relationship:
output voltage = ( adjustment value + 1) ÷ 256 × 5V
Precautions During Developer Bias Adjustment
If the entire image is foggy in spite of appropriate main charger grid voltage or toner density, adjust
the developer bias on the control panel (lower the BIT). If the developer bias is lowered too much,
however, the following problems may occur:
• The image contrast drops (tend to produce faint images).
• The carrier in the developer adheres to the photosensitive drum, and scratches tend to occur
more easily on the cleaning section.
<Display messages>
100%
TEST MODE
0%
TEST MODE
YYY
TEST MODE
ZZZ
100%
1 .
TEST MODE
1 - 61
A A4
Code No.
XXX A4
XXX A4
Z'Z'Z'
A A4
ADJUSTMENT