Ricoh G104, Service Manual

Page: 267 / 601

PHOTOCONDUCTOR UNIT
SM 6-39 G104
Detailed
Des
cription
s
6.5.3 DRUM CHARGE AND QUENCHING
This machine uses a charge roller [A]. The charge roller charges the drum surface
with a negative charge. The 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 so).
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) illuminates the full area of the drum.
G105D103.WMF
[A]
[B]
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA