Ricoh TH-C1b - Power Supply; Circuit; Paper Transfer Roller Bias; Discharge Plate

10 February 2005 PAPER TRANSFER AND SEPARATION
6-63
Detailed
Descriptions
6.11.3 POWER SUPPLY
Circuit
High voltage supply [A] → Terminal [B] → Paper transfer roller shaft [C]
[A]: High voltage supply
[B]: Terminal
[C]: Paper transfer roller shaft
[D]: Temperature-humidity sensor
(inside the rear-right cover)
[E]: Discharge plate (negative
charge)
Paper Transfer Roller Bias
Normally, a constant current is applied to the paper transfer roller shaft [C].
The current varies with paper type, size, and thickness as well as humidity.
Discharge Plate
The discharge plate [E] discharges the remaining charge on the paper going past
the paper transfer roller. This helps the paper separate from the image transfer belt.
Temperature/Humidity Control
The temperature-humidity sensor [D] is inside the rear-right cover. The sensor
output is used to control the current for the paper transfer roller.
The temperature and humidity can be read with SP2-912.
B156D049.WMF
[B]
[A]
[C]
[D]
[E]