Konica Minolta bizhub c650 Service Manual page 121

14. Transfer Corona section
14.3.8 Charge neutralization and separation of paper
• To neutralize any charge potential left in the paper which has undergone the 2nd image
transfer stage, a Charge Neutralizing Cloth is installed to the guide plate after the 2nd
Image Transfer Roller.
• The output of the Charge Neutralizing Cloth is switched automatically using the high volt-
age unit according to the paper type and the environmental conditions, and whether the
print cycle is for printing the 1st side or 2nd.
• In order to separate thin paper or curled paper caused by 2-sided printing from the trans-
fer belt without fail after the 2nd image transfer, transfer belt separator claws are
mounted at 5 places.
Charge Neutralizing Cloth
2nd Image
Transfer Belt
Transfer Roller
• Switching of output of the charge neutralizing cloth
Paper Type Ambience
Low humidity
1-sided
Normal
printing on the
plain paper
High humidity
2nd side of
2-sided
printing on the
plain paper
Special paper
other than
plain paper
86
HV2
A00JT2C022AA
Control
Bias applied
Bias applied
GND through
resistors
– Bias applied
GND through
–
resistors
Theory of Operation Ver. 8.0 Jun. 2008
Paper Separator Claws
Detailed description
• A negative charge, which is the reverse polarity to
the positive output from the 2nd Transfer Roller, is
applied to prevent the paper from being wound
around the Transfer Belt.
• To prevent separation noise, grounded through
resistors regardless of the ambient conditions.
• Bias is applied regardless of the ambient condi-
tions, since the paper to go to the 2nd side print
cycle, which has undergone the fusing process, has
the condition equivalent to paper under low humid-
ity ambience.
• Paper is stiff enough to present no separation prob-
lems.
• To prevent separation noise, grounded through
resistors regardless of the ambient conditions.