Konica Minolta bizhub C650 Service Manual page 668

Field Service Ver. 8.0 Jun. 2008
Code Item
C3305 Fusing cooling fan motor/
3 failure to turn
C3423 Fusing heaters trouble
(pressurizing side)
C3424 Fusing heaters trouble
(soaking side)
C3425 Fusing heaters trouble
(NC sensor)
C3461 Release new fusing unit
C3721 Fusing abnormally high
temperature detection
(Center of the heating
roller)
C3722 Fusing abnormally high
temperature detection
(Edge of the heating
roller)
C3723 Fusing abnormally high
temperature detection
(pressurizing side)
C3724 Fusing abnormally high
temperature detection
(soaking side)
C3725 Fusing abnormally high
temperature detection
(NS sensor)
C3822 Fusing abnormally low
temperature detection
(Edge of the heating
roller)
C3823 Fusing abnormally low
temperature detection
(pressurizing side)
Detection timing
• The fan motor lock signal remains HIGH for
a predetermined continuous period of time
while the motor remains stationary.
• After warm-up operation starts, the fusing
pressure roller thermistor does not detect a
temperature as high as a predetermined
one though a predetermined period of time
has elapsed.
• After warm-up operation starts, the soaking
roller thermistor does not detect a tempera-
ture as high as a predetermined one though
a predetermined period of time has elapsed.
• After warm-up operation starts, the NC sen-
sor does not detect a temperature as high
as a predetermined one though a predeter-
mined period of time has elapsed.
• A new installation is not detected when a
new fusing Unit is installed.
• The heating roller thermistor/3 continues to
detect a temperature higher than a predeter-
mined one for a predetermined period of
time.
• The signal is turned ON to activate the hard
ratchet in the middle of the heating side.
• The heating roller thermistor/2 continues to
detect a temperature higher than a predeter-
mined one for a predetermined period of
time.
• The signal is turned ON to activate the hard
ratchet at the edges of the heating side.
• The fusing pressure roller thermistor contin-
ues to detect a temperature higher than a
predetermined one for a predetermined
period of time.
• The soaking roller thermistor/1 continues to
detect a temperature higher than a predeter-
mined one for a predetermined period of
time.
• The signal is turned ON to activate the hard
ratchet on the soaking side.
• The NC sensor continues to detect a tem-
perature higher than a predetermined one
for a predetermined period of time.
• The heating roller thermistor/2 continues to
detect a temperature lower than a predeter-
mined one for a predetermined period of
time.
• The fusing pressure roller thermistor contin-
ues to detect a temperature lower than a
predetermined one for a predetermined
period of time.
16. Malfunction code
Trouble iso-
lation com- Rank
pliant unit
⎯
B
⎯
A
⎯
A
⎯
A
⎯
B
⎯
A
⎯
A
⎯
A
⎯
A
⎯
A
⎯
A
⎯
A
613