Development Bias; Copying; Making Id Sensor Patterns - Ricoh Aficio 480W Dolphin-C2 Service Manual

DEVELOPMENT

6.6.3 DEVELOPMENT BIAS

Copying

The CBG (Charge, Bias, Grid) power pack
applies [A] a negative bias (-680V) to the
development roller, slightly higher than the
residual charge on the drum.
The development bias during copying
depends on SP 2201 001.

Making ID Sensor Patterns

The machine has two ways of making the
ID sensor patterns. These are Low Duty
Mode and High Duty Mode. The mode
used depends on SP 2201 004.
If the average copy volume is high (2.5
km/month or more), SP2201 004 should be
switched to High Duty Mode to prevent toner scattering.
However, if the machine is in High Duty Mode and the average copy volume
becomes low again, image density may become lower. If this happens, switch back
to Low Duty Mode.
The ID sensor pattern development bias voltages for high and low duty modes can
be adjusted with SP 2201 002 and 003, as shown in the following table.
Development bias for the ID sensor
2201 002
pattern (Low Duty Mode)
Development bias for the ID sensor
2201 003
pattern (High Duty Mode)
Selects Low Duty Mode or High Duty
2201 004
Mode
[A]
Default setting: -390 V
Default setting: -460 V
Default setting: Low Duty
Mode
6-30
28 April 2005
B188D932.WMFF