Currents Applied To Leading Edge, Image Areas, And By-Pass Feed - Ricoh A-P4 Service Manual

6. Details
tendency of the current to flow directly from the transfer belt to the drum and not through the paper which
could cause an insufficient amount of toner to transfer to narrow width paper.
Thick paper must be fed from the by-pass tray because SP modes are available only for the by-pass tray
in order to accommodate thick paper. By default, the current for paper narrower than 216 mm is 1.5 times
the normal current.
This illustration shows the SP modes, which control these currents. The base transfer current ('current' in the
diagram) depends on SP 2-301. This is different for various parts of the image, and is different for the by-
pass tray; see the next page for details.
6

Currents Applied to Leading Edge, Image Areas, and By-Pass Feed

Transfer current can also be adjusted for the leading edge and the image area, and for by-pass feed. The
timing for starting to apply leading edge current, for the switchover from leading edge current to image
area current, and for switching off at the trailing edge can also be changed.
The table below lists the SP modes you can use to adjust these settings.
SP2-301: Transfer Current Adjustment
Image areas
Leading edge areas
SP2-911: Transfer Current Timing
Timing
356
SP2-301-1 1st Side of Paper
SP2-301-2 2nd Side of Paper
SP2-301-4 By-pass Feed
SP2-301-3 Leading Edge
SP2-301-5 Leading Edge By-pass Feed
SP2-911-1 On Timing (at leading edge)