Image Transfer Current (B129/B130/B168/B169) - Gestetner B130 Service Manual

IMAGE TRANSFER CURRENT (B129/B130/B168/B169)

6.21 IMAGE TRANSFER CURRENT
(B129/B130/B168/B169)
There are two transfer current levels: low and high.
1. Low level: Before image transfer starts, the high voltage supply board supplies
+10µA to the transfer roller. This prevents the transfer roller from attracting any
positively charged toner onto the drum surface.
2. High level: During image transfer, the high voltage supply board supplies a high
level current (see the table) to the transfer roller. This enables the transfer roller
to attract toner onto the paper.
3. When the trailing edge of the paper has passed the transfer roller, the high
voltage supply board stops supplying the transfer current. If the copier is
printing more pages, the high voltage supply board supplies the low level
transfer current.
These levels can be adjusted (
level, use caution:
• Increasing a transfer current level may produce ghost images (some part of
image near the leading edge reappears in other part of the page).
• Increasing a transfer current level may damage the OPC drum.
The table lists the default settings and SPs.
Job type
Normal paper
Thick paper
Duplex copying
B129 Series/B044 Series
CÓPIA NÃO CONTROLADA
SP2-301). When increasing a transfer current
amp
0 µA
SP2-301-001
0 µA
SP2-301-002
0 µA
SP2-301-003
6-54
CÓPIA NÃO CONTROLADA
SP
Rev. 11/2004
SM