KX-MC6020RU, KX-FAP317A, KX-FAB318A - Panasonic Fax Service Manual (repair manual). Page 125

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printed on the paper. The registration sensor detects whether the sheet of paper arrived at the registration roller after being properly
picked and traveling through the paper feed rollers in the optional lower Input tray.

The paper feed unit has the standard paper cassette paper empty and registration sensors. The standard paper cassette has the
MPT paper empty sensor for multi-purpose tray and the paper size detection levers. The standard paper cassette paper empty sen-
sor detects whether the paper is set in the standard paper cassette. The paper size detection levers are used for detecting paper
size and whether the standard paper cassette is installed in the printer. The MPT paper empty sensor detects whether the paper is
set in the MPT tray. 

Once all four layers of toner reside up on the accumulator belt, the registration roller clutch is energized to advance a sheet of paper
(which has already been picked) to the second  transfer roller. The toner image on the rotating accumulator and the paper that is
being fed into the image unit are synchronized for proper alignment. The leading edge of toner image on the accumulator belt is
aligned 4 mm from the leading edge of the paper. A strong positive voltage in the second  transfer roller attracts the toner from the
accumulator belt to the paper. The second  transfer roller voltage is approximately +1400 volts. This voltage varies depending 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. The scraped toner is discharged to the waste toner car-
tridge by the spiral paddle shaft.