Toner Transfer To Paper; Figure 5-10 Transferring Toner To The Paper - Tektronix PHASER 560 Service Manual

Toner transfer to paper

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Once all four layers of toner have been picked up on the accumulator belt, The
aligning roller clutch is energized to advance a sheet of paper (which has already
been picked) to the second bias transfer roller. (In the user manual the second
bias transfer roller is referred to as the transfer roller , a customer-replaceable
consumable item.) The movement of the sheet of paper is timed so that the
leading edge of the toner image on the accumulator belt meets with the paper
after 5 mm of the leading edge of the paper has passed. A strong positive
voltage in the second bias transfer roller, located under the sheet of paper,
attracts the toner from the accumulator belt to the paper. The voltage of the
transfer roll varies from +500 to 2400 volts based on the ambient temperature,
humidity, print speed and media being printed upon. The paper (or
transparency film) advances at the same speed as the accumulator belt.
As the toner is being transferred to the paper, the accumulator belt cleaning
blade is activated. This blade scrapes any remaining traces of toner from the
accumulator belt prior to the next image transfer of toner. At the second bias
transfer roller, strong positive charge equal to the voltage applied to the second
bias transfer roller plus +400 volts on the adjacent cleaning roller attracts
left-over toner particles from the transfer roller. A blade scrapes the toner off the
cleaning roller into the toner waste bin.
The strong positive
potential of the
second bias transfer
roller attracts toner
to the paper.
Second bias
transfer roller
Cleaning
roller at
transfer
roller plus
400 v

Figure 5-10 Transferring toner to the paper

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+500 ~2400 v
Waste
toner
bin
5
Theory of Operation
The cleaning blade
scrapes leftover
traces of toner from
the accumulator belt.
Accumulator belt
cleaning blade
9697-35
5-13
Service Manual