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TRANSFER BELT UNITS
Paper Transfer Bias
The copier transfers the toner image on the image transfer belt to the paper using
a bias roller system. A constant current system is used to generate the paper
transfer bias. The paper transfer bias is provided directly to the paper transfer bias
roller shaft by high voltage supply board T2 [A].
The paper transfer current is modified based on the following four conditions:
1. Absolute humidity
The current value is switched under
low temperature/low humidity
conditions and high temperature/high
humidity conditions according to the
absolute humidity that is measured by
the temperature and humidity sensors
[B] on the side panel of the copier
main unit.
2. Trailing edge of the paper
The transfer current is increased for
the first 15 mm at the leading edge
and the last 15 mm at the trailing
edge. This prevents poor image
transfer at the leading and trailing
edges.
3. Paper transfer speed
The current value is switched
according to the process speed of the
paper— for the normal paper and
OHP/thick paper modes.
4. Side of the paper (duplex)
The current value is switched for the
front and back sides of the paper.
SP2-310: Set secondary transfer bias
SC450: Paper transfer bias PP (high-
voltage power supply: T2, D) error
SC495: Temperature sensor error
SC496: Humidity sensor error
2-84
30 March, 1999
[A]
A269D416.WMF
A269D417.WMF
[B]
A269D422.WMF
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