2Nd Transfer Voltage Control; 2Nd Transfer Voltage Setting Control (Atvc: Auto Transfer Voltage Control) - Konica Minolta magicolor 5550 Service Manual

14. Transfer section (2nd transfer)
14.3.3

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.
14.3.4

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.
• The temperature inside the main body changes beyond the specified range during a
multi print cycle.
• Image stabilization control is executed.
• 1000 to 2000 printed pages have been produced after the last 2nd transfer voltage con-
trol was performed.
• The transfer roller unit is replaced
• The temperature and humidity inside the main body change beyond the specified range
for the first time after the last 2nd transfer voltage control was performed.
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.
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Theory of operation Ver. 1.0 Nov. 2006