2Nd Transfer Voltage Control; 2Nd Transfer Voltage Setting Control (Atvc: Auto Transfer Voltage Control); 2Nd Transfer Roller Cleaning Control - Konica Minolta bizhub C35 Service Manual

DRAFT
Theory of operation Ver. 1.0 Feb. 2010
15.3.2

2nd transfer voltage control

• The transfer voltage is applied to the 2nd transfer roller in order to transfer the toner
image from the transfer belt to the media.
• The transfer voltage is applied after the 2nd transfer roller has been pressed against the
transfer belt.
15.3.3

2nd transfer voltage setting control (ATVC: auto transfer voltage control)

• The transfer voltage is corrected to reduce effect from the transfer belt and environmen-
tal changes of toner.
A. Operation timing
• A print request is accepted.
• During a multi-print cycle, the temperature inside the main body changes by a predeter-
mined value or more from the level during execution of ATVC, and a predetermined num-
ber of printed pages or more have been produced since the execution of the previous
ATVC.
B. Control
1. 1. The 2nd transfer roller is pressed against the transfer belt.
2. A constant current is applied to the 2nd transfer roller.
3. The voltage of the 2nd transfer roller surface is detected.
4. Using a conversion formula, the output value of the transfer voltage is determined.
5. The current temperature inside the main body is detected and backed up.
15.3.4

2nd transfer roller cleaning control

• DC positive and negative transfer bias voltages are alternately applied to the 2nd transfer
roller. This allows toner residue on the surface of the 2nd transfer roller to be transferred
back to the transfer belt, thus cleaning the 2nd transfer roller.
• Any voltage for other control purposes is not applied during the cleaning procedure.
• The toner transferred back to the transfer belt is collected by the cleaning blade.
Cleaning blade
A. Operation timing
• The 2nd transfer roller cleaning sequence is carried out after the transfer belt has been
cleaned during recovery from a media misfeed or malfunction.
• If a predetermined number of printed pages or more have been produced after the last
cleaning sequence when the printer completes a print cycle and is then brought to a
stop, a new cleaning sequence is carried out before the printer is brought to a stop.
• The cleaning sequence is carried out when a media size error occurs.
15. TRANSFER SECTION (2nd transfer)
Transfer belt
2nd transfer roller
HV1
4138to2579c0
49