Drum Charge And Quenching - Ricoh G-P3 Service Manual

Photoconductor Unit

Drum Charge and Quenching

This machine uses a charge roller [A]. The charge roller gives the drum surface a negative charge. The
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high voltage supply board, which is at the rear of the machine, applies a dc and ac voltage (at a constant
current) to the roller. The ac voltage helps to make sure that the charge given to the drum is as constant as
possible.
The machine automatically controls the charge roller voltage if automatic process control is enabled (that
is, if SP3-501-001 is set to 0). However, if process control is turned off, (that is, if SP3-501-001 is set to
1), the dc voltage is the value stored in SP2-201-001 to –004 or SP2-201-006 to -009 (do not adjust in
the field unless told to do this).
The diameter of the roller is 30 mm (the circumference is about 94.2 mm).
The cleaning brush roller [B], which always touches the charge roller, cleans the charge roller.
For quenching at the end of every job, light from the quenching lamp (LED array in the PCU) hits the full
area of the drum.
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