Charge Roller Cleaning - Gestetner B130 Service Manual

Rev. 11/2004
How Correction is Made
Immediately after creating the ID sensor pattern [A] used for toner density control,
the machine generates another pattern [B] for charge voltage correction by
intensifying the development bias to –600 V. The laser remains off, but a small
amount of toner moves to the drum because of the slight charge difference between
the drum and development roller. The ID measures the pattern's density (Vsdp) and
the bare drum voltage (Vsg); the FCU compares the difference and adjusts the
roller voltage accordingly.
• If Vsdp/Vsg > 0.95: Change charge roller voltage by +50 V (less negative).
• If Vsdp/Vsg < 0.90 = Change charge roller voltage by –50 V (more negative).
NOTE: The current ID sensor readings can be viewed using SP2-221.

6.15.3 CHARGE ROLLER CLEANING

A cleaning roller [A] removes toner and debris that the roller picks up from the drum.
SM
CÓPIA NÃO CONTROLADA
[A]
6-35
CÓPIA NÃO CONTROLADA
DRUM CHARGE
B046D304.WMF
B129 Series/B044 Series