Developer Mixing
The toner is supplied from the hopper [A]. Two mixing coils [B and C] move the developer forward and
rearward to mix the developer.
This occurs at these times:
• Immediately after a new PCU is installed.
• During the process control self check
• During toner supply
• During development.
• Every 36 hours (can be changed with SP 3554 003)
• If absolute humidity changes more than ± 6 g/m
3
(e.g. 23°C/ 50% Þ 27°C/ 70%). The humidity
threshold can be changed with SP 3554 004.
Development Bias
The high voltage supply board #2 supplies development bias to the development roller through the
receptacle at the rear of each development unit.
There are ac and dc bias voltages. The ac bias improves toner transfer to the drum.
Development
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