Ricoh Aficio BP20N, Service Manual

Page: 120 / 144

SYSTEM LAYOUT
G144/G145 6-8 SM
6.3.1 PAPER FEED UNIT
The paper feed unit consists of the following.
• Standard paper tray unit
• Optional paper feed unit
•
By-pass tray
Paper Separation Method
Individual sheets are separated in the paper feed unit via the feed/friction pad
method. Paper passes over a spring loaded friction pad that separates the sheets
of paper as they are fed into the machine.
Paper Tray
The paper cassette uses a center loading method. The machine does not have a
paper size sensor. Software detects the size of the first sheet of paper as it is fed
through the machine. Both the rear and side paper guides can be adjusted to
handle the various paper sizes.
A paper empty sensor detects the presence of paper (capacity: 250 sheets). An
indicator flag on the front of the paper tray unit shows the amount of paper
remaining in the tray.
Pick-up roller
The pick-up roller picks up and feeds paper into the printer. It also removes static
charge on the paper.
By-pass tray
The by-pass tray holds non-standard paper sizes and special media (envelopes,
transparencies etc.). Unlike the paper cassette, the by-pass tray does have a paper
empty sensor. A friction pad ensures that paper separates correctly. The by-pass
tray holds a maximum of 50 sheets of paper or envelopes.
Optional Paper Feed Unit
The optional paper feed unit is the same as the standard paper tray unit and has a
capacity of 250 sheets.