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Diagnostic information 2-11
920 .22 Hot roll fell too far below
the desired temperature
while printing. Fuser
page count between
200,000 and 299,999.
• Bad thermistor, circuit, or cabling.
• Noisy thermistor signal.
• Fuser not receiving AC power.
• Poor supply line voltage.
• Low voltage or incorrect lamp.
• Incorrect hot roll.
Go to “920.xx—Cold fuser
service check” on page 2-87.
920 .23 Hot roll too cool while
checking for slope
change. Fuser page
count between 200,000
and 299,999.
• Bad thermistor, circuit, or cabling.
• Noisy thermistor signal.
• Fuser not receiving AC power.
• Poor supply line voltage.
• Low voltage or incorrect lamp.
• Incorrect hot roll.
Go to “920.xx—Cold fuser
service check” on page 2-87.
920 .24 Hot roll too cool when
heating to desired
temperature after slope
change. Fuser page
count between 200,000
and 299,999.
• Bad thermistor, circuit, or cabling.
• Noisy thermistor signal.
• Fuser not receiving AC power.
• Poor supply line voltage.
• Low voltage or incorrect lamp.
• Incorrect hot roll.
Go to “920.xx—Cold fuser
service check” on page 2-87.
920 .26 Fuser is not increasing
in temperature even
though the lamp has
been on for an extended
tim. Fuser page count
between 200,000 and
299,999.
• Fuser is not receiving AC power.
• Poor supply line voltage.
Go to “920.xx—Cold fuser
service check” on page 2-87.
920 .27 Fuser has been below
the desired temperature
for too long while media
is in the nip. Fuser page
count between 200,000
and 299,999.
• Bad thermistor, circuit, or cabling.
• Very noisy thermistor signal.
• Fuser not receiving AC power.
• Poor supply line voltage.
• Excessive load on the fuser.
• Low voltage or incorrect lamp.
• Incorrect hot roll.
• Abrupt change in temperature that
has disrupted control.
Go to “920.xx—Cold fuser
service check” on page 2-87.
920 .31 Under temperature
during steady state
control. Fuser page
count between 300,000
and 399,999.
• Bad thermistor, circuit, or cabling.
• Fuser not receiving AC power.
• Poor supply line voltage.
• Low voltage or incorrect lamp.
• Incorrect hot roll.
Go to “920.xx—Cold fuser
service check” on page 2-87.
Service error codes (9xx.xx) (continued)
Error
code
Sub
codes
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