Opc Drum; Charge - Ricoh FAX4700L Service Manual

December 21st, 1995

2.2.2. OPC Drum

[E]
An organic photoconductor drum [A] is used in this machine. The diameter of
the drum is 30 mm. It is driven by the main motor [B] through a gear train.
The toner application roller [C], development roller [D], and transfer roller [E]
are also driven by the same gear train. The drum unit can be replaced by the
user.

2.2.3. Charge *

[A]
The CTM contains a charge corona unit. The corona wire [A] generates nega-
tive ions when the power pack [B] applies a constant current of -305 ± 5 µA
(the voltage is about -5.3 kV). The grid plate [C] ensures that the charge is
uniformly spread out. The zener diode [D] ensures that the charge on the
drum does not exceed -750 ± 50 V.
The charge corona unit contains a wire cleaner [E] for user maintenanace.
The ozone fan on the left hand side of the machine provides air flow to the
charge corona unit, and the ozone filter (a paper filter coated with carbon) de-
composes the ozone generated around the drum by the corona discharge.
[D]
[C]
[B]
DETAILED SECTION DESCRIPTIONS
[A]
[C]
2-15
PRINTING
[B]
H515D604.wmf
[E]
[D]
H515D605.wmf