Ricoh D109 Service Training page 64

The machine has two transfer current levels: Low and High.
Slide 64
Transfer Current Timing
You can adjust the transfer current level with SP 2301.
Examine the default current settings. If you do not adjust the transfer current
level correctly, the following may happen:
Parts of the page being printed may have ghost images.
You may damage the OPC drum.
Transfer Current Timing
Low level: The high voltage supply board supplies 10µA to the
transfer roller before image transfer starts. This prevents the
transfer roller from getting positively charged toner on the drum
surface.
High level: The high voltage supply board supplies high level of
current to the transfer roller at the time of image transfer. This
allows the transfer roller to move toner to the paper.
The high voltage supply board does not supply current when the
trailing edge of the paper has passed the transfer roller. The high
voltage supply board supplies low level current if the machine
prints more pages.
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S-C4L Training