Drum Charge - Ricoh G031 Service Manual

TONER CARTRIDGE

2.3.3 DRUM CHARGE

[A]
[B]
[E]
[C]
[D]
G031D511.WMF
This machine uses a drum charge roller system instead of a scorotron corona wire
system to charge the drum. The drum charge roller [A] always contacts the surface
of the drum [E] because of the charge roller pressure springs [C], and gives a
negative charge to the drum surface. While the drum is rotating, the drum charge
roller also turns because of friction between the roller and the drum.
The drum charge roller system generates less ozone than a scorotron corona wire
charge system. Due to this, there is no ozone filter in the machine.
The high voltage supply board gives a negative dc voltage to the drum charge
roller through the charge roller terminal [B], charge roller pressure spring [C], and
the charge roller bushing [D]. This gives the drum surface a negative charge of -
600 V.
The high voltage supply board also applies 2 kVp-p 1 kHz ac to the charge roller.
This ac removes any remaining voltage on the drum.
The toner cartridge has no cleaning pad, temperature control, or contact
mechanism for the drum charge roller. The material of the drum charge roller
allows a simple mechanism. The drum charge roller is part of the toner cartridge,
so when the toner runs out, the drum charge roller is changed at the same time.
This happens before the drum charge roller gets dirty.
G031/G032 2-12 SM