Toner Transfer To Paper; Figure 5-10 Transferring Toner To The Paper - Tektronix Phaser 550 Service Manual

Toner transfer to paper

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 +700 to 1750 volts based on the ambient humidity, print
speed and whether paper or transparency is 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.
The strong positive
potential of the
second bias transfer
roller attracts toner
to the paper.
Second bias
transfer roller

Figure 5-10 Transferring toner to the paper

Theory of Operation
The cleaning blade
scrapes leftover
traces of toner from
the accumulator belt.
Accumulator belt
cleaning blade
+700 ~1750 v
Service Manual
5
9322-84
5-13