Image Transfer Current Timing (B044/B045/B046) - Gestetner B130 Service Manual

6.20.2 IMAGE TRANSFER CURRENT TIMING (B044/B045/B046)

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.
Main Tray /
Paper Size
Optional Tray
A4, LT
B5
A5
A6
SM
CÓPIA NÃO CONTROLADA
IMAGE TRANSFER AND PAPER SEPARATION
"High" Transfer Current (µA)
Normal
6 6
— 8
— 10
— 12
6-53
CÓPIA NÃO CONTROLADA
Bypass
Thick Special (OHP)
8 8
6 —
6 —
6 —
B129 Series/B044 Series