Transport Belt - Ricoh J012 Service Manual

6.8.7

TRANSPORT BELT

This printer uses the BT (Belt Transfer) system to transport paper through the paper path.
A high voltage power supply pack (HVPS) [1] energizes the charge roller below the transport
belt [2].
The charge roller applies a charge to the transport belt. This static charge attracts the paper
to the transport belt and holds it in place so it does not move during printing.
A temperature/humidity sensor below the transport belt monitors the temperature and
humidity near the charge roller and transport belt. The temperature/humidity readings of this
sensor are matched with values in lookup tables cross-indexed with combinations of
temperature and humidity readings. The values read from the tables are used to adjust the
width of the bias (bias pitch) applied to the transport belt. This operation, called belt charge
control, operates within the following ranges of temperature and humidity:
Temperature: 0C to 35C (32F to 95F)
Humidity: 0% to 100%
The machine uses the feedback of the temperature/humidity sensor to reduce the width of
the charge applied to the transport belt below the print heads. This reduces the size of the
electrical field to the smallest size that can still provide the optimum charge to keep the
paper on the belt at the leading edge, center, and trailing edge of the paper without
interfering with the operation of the print nozzles.
Belt charge control is done for every paper feed station (Tray 1, Tray 2, and bypass) and for
every paper type (normal paper, envelopes, thick paper, and OHP).
SM
CÓPIA NÃO CONTROLADA
Adjusted in 2.5C (4.5F) steps
Adjusted in 10% steps
6-65
CÓPIA NÃO CONTROLADA
Paper Feed, Transport, Paper Exit
J012/J013/J014