Development Bias Control - Ricoh A156 Service Manual

6.5 DEVELOPMENT BIAS CONTROL

The actual development bias voltage applied depends on various process
control corrections that are added to the base voltage. These are explained
in Process Control section (see the Summary section for a quick-look
reference).
In addition, the technician can adjust the base development bias voltage
using SP mode 2-201-001 as shown below.
SP2-201-1 Setting
Development Bias
+80 V +60 V +40 V +20 V
Correction Voltage
Darker
This adjustment should be done only if exposure lamp voltage adjustment
(SP4-001) fails to achieve the desired image density.
The correction selected here does not affect toner supply control or pattern
detection, as it is not applied when developing sensor patterns on the drum,
and the bias control system is different (see Process Control for full details).
STM
1 2 3 4
2-57
*5 6 7 8
±0 V
–20 V –40 V –60 V –80 V
Lighter
*: Factory setting
A156/A160/A162
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