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DEVELOPMENT
10 February 2005
6.9.6 POWER SOURCE
[C]
[B]
[D]
[E]
[F]
[A]: Development unit
[B]: Rear-side terminal
[C]: Development roller
[D]: Bias terminal
[E]: Harness terminal
[F]: High voltage supply
[G]: Doctor roller
[A]
B156D041.WMF
[G]
Development, Toner Supply, and Doctor Rollers
When a development unit [A] comes into contact with the OPC belt, the bias
terminal [D] comes into contact with the harness terminal [E]. Then, a negative
charge is supplied to the unit.
The negative charge on the doctor roller is the same size as the charge on the
development roller and toner supply roller.
Doctor Roller
The doctor roller [G] restricts the amount of toner on the development roller [C].
The high voltage supply [F] applies a charge to the doctor roller through the rear-
side terminal cable [B]. This charge is the same as the charge applied to the
development roller. However, the development roller charge is applied through a
different terminal [E].
☛ ! Mono-component Development – Toner Metering Blade (similar principle)
6-56
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