2Nd Transfer Roller Cleaning - Konica Minolta magicolor 1690MF Service Manual

14. 2nd transfer section/ media separation
(1) Retraction sequence
1. When the 2nd image transfer pressure/retraction solenoid (SD4) is energized in the
condition in which the 2nd transfer roller is pressed against the transfer belt, the
Pressure/retraction clutch rotates a half turn. This moves the Pressure slider.
2. When the Pressure slider is moved, the 2nd transfer assy, which has been pushed
up by the ribs on the Pressure slider, lowers.
3. When the 2nd transfer assy lowers, it allows the 2nd transfer roller to be retracted
from the transfer belt.
2nd image transfer pressure/retraction solenoid (SD4)
Pressure slider
14.3.2

2nd transfer roller cleaning

• 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.
• The toner transferred back to the transfer belt is collected by the cleaning blade.
A. Operation timing
• The machine performs a cleaning sequence if it detects a sheet of paper having a length
shorter than the length of the specified paper type.
• The cleaning sequence is also carried out during a resetting sequence following a paper
misfeed and the opening of the door during a print cycle.
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Ribs
Pressure/retraction clutch
Transfer belt
Theory of Operation Ver. 1.0 Nov. 2008
2nd transfer assy
2nd transfer roller
A034T2C536AA
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