IMAGE TRANSFER AND PAPER SEPARATION
SM 6-45 B044/B045/B046
Detailed
Descriptions
6.15.2 IMAGE TRANSFER CURRENT TIMING
There are two current levels used during the transfer sequence: low and high.
1. At time of write-start signal, the high voltage supply board generates low
current (5 A) to the roller. This prevents positive toner on the drum from
moving to the roller.
2. After a certain time the high voltage supply board generates high current to
the roller, causing toner to move from drum to paper. (See table below.)
3. After the sheet has passed the roller, current goes off (if printing is finished) or
returns to low (if multicopy job with nonstop feed).
The table below shows the default high current levels. You can adjust these levels
with SP2-301. But please note that setting the current too high can cause a
ghosting effect (where the image at the top of the sheet repeats as a ghost lower
down on the page) and in the worst case may damage the drum.
"High" Transfer Current (µA)
Bypass
Paper Size
Main Tray /
Optional Tray
Normal Thick Special (OHP)
A4, LT6 688
B5 — 8 6 —
A5 — 10 6 —
A6 — 12 6 —
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