Ricoh A230, Service Manual, Page: 125 / 1134

IMAGE TRANSFER AND PAPER SEPARATION
2-62
A230/A231/A232 SM
Correction for paper width and thickness
To counteract the effects of paper width and thickness, a range of SP modes are
available.
For paper width, there are two thresholds. The factory settings are 150 and 216
mm. Below 216 mm, the transfer current can be increased (by default, it is
multiplied by 1.2 for the main body paper trays). Below 150 mm, the transfer
current can be set even higher, although by default it is kept the same as the
current for below 216 mm. The higher current allows for the fact that current prefers
to go to the drum from the belt directly, and not through the paper, which leads to
insufficient toner transfer for narrow paper widths.
For thickness, it is assumed that the user will use thicker paper from the bypass
tray, so separate settings are available for this tray. By default, the current for
paper narrower than 216 mm is 1.5 times the normal current.
The drawing shows the SP modes which control these currents.
Currents applied to leading edge and image areas
The transfer current can also be different for the leading edge and the image area.
There are separate adjustments for bypass feed for this also. 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.
Transfer current SP modes
- Image areas -
Paper trays: Side 1, SP2-301-1; Side 2, SP2-301-2
Bypass: SP2-301-4
Leading edge areas
Paper trays: SP2-301-3, Bypass: SP2-301-5
- Timing -
Leading edge start: SP2-911-1
Switchover to image area: SP2-911-2
Image area end (trailing edge): SP2-911-3
SP2-309-1
Default: 150 mm
SP2-309-2
Default: 216 mm 2 9 7 m m
SP2-309-3
Current x 1.2
SP2-309-4
Current x 1.2
Current x 1.0
SP2-309-5
Current x 1.5
Paper Tray
SP2-309-6
Current x 1.5
Current x 1.0
By-pass Tray
0
A231D541 WMF