PROCESS CONTROL August 2006
6-80
List of Process Control Acronyms
The potential control phase of process control involves many adjustments. Here is
list of acronyms used in the descriptions of process control adjustments.
Acronym
Description
Cdc Charge DC bias
Vb Development charge bias
Vb
1
Development charge bias after Vr (residual potential) adjustment
Vd Drum potential after the drum is charged by the charge roller.
Vd
1
Drum potential after Vr (residual potential) adjustment
Vdhome The electrical potential of the drum after a fixed dc bias (DC –700V) is applied
by the drum charge roller.
Vdp Development potential (Vb – Vpl). This is the ability to attract toner to the drum.
Vk Development start voltage (checks the developer at the beginning of process
control to determine whether it has deteriorated)
Vl Light potential. Development potential of areas on the drum exposed by the
laser diodes. Maximum laser power has been applied to the diodes.
Vpl Electrical potential after laser exposure, with 24/63 of maximum laser power
(power is controlled with PWM).
Vpl
1
Electrical potential (Vpl) after Vr (residual potential) adjustment
Vpp Charge AC bias.
Vr Residual potential
Vsg_dif Vsg after checking the bare surface of the ITB by the diffused reflection sensor.
Vsg ID sensor output after reading bare surface of the ITB
Vsg_reg Vsg after checking the bare surface of the ITB by the direct reflection ID sensor.
Vsp ID sensor output from the most recent ID sensor pattern.
Vt TD sensor output at the present time.
Vtcnt Gain value calculated during TD sensor initialization. This is used to adjust the
Vt (TD sensor output). A large gain increases Vt, and a small gain decreases it.
The result of this calculation is also used to calibrate Vt during TD sensor
initialization.
Vtref Target output of the TD sensor. The machine always tries to adjust the toner
WT% in the developer to bring Vt closer to Vtref.
1
Adjustment done for each color Y, M, C, K
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