Nd Transfer - Lexmark C54x Product Study Manual

Lexmark C54x/X54x Color Product Study Guide
nd
2 Transfer
Once the four planes of color are transferred to the ITU from the Photoconductors, the image is carried
towards the Transfer Roll (this is part of the ITU assembly). The media is picked from the input source
and timed to pass between the ITU Belt and Transfer Roll when the image on the Belt reaches the
second transfer area.
The high voltage power supply sends voltage to the Transfer Roll to create a positive charge. As the
media passes between the ITU and Transfer Roll, the entire image is transferred to the media due to the
charge differential between the negative toner on the ITU Belt and the positive Transfer Roller.
Service Tips
•
If the transfer roller has nicks, pits or flat spots on it, the surface doesn't come into contact with the media and transfer
unit properly. This will cause voids or lights spots on the page or repeating voids/light areas, because the toner can't
be fully transferred due to the charge difference in the areas of damage.
•
If the transfer roller does not engage the transfer unit, or does not have voltage coming from the high voltage power
supply, the toner will not fully transfer from the transfer unit; the entire page will be very light or blank. Any toner that
does transfer will be due to a "contact" transfer instead of a "charge" transfer. Check the high-voltage power supply
contacts to the transfer roller.
ITU (belt surface)
Transfer Roller
nd
(2 transfer)
For Training Purposes Only 24
Rev 2.6
9/15/2009