Lexmark X642E, Service Manual, Page: 57 / 525

Diagnostic information
2-19
7002-xxx
920 .41 Hot roll took too long to
heat up after
transitioning to new
enhanced mode. Fuser
page count between
400,000 and 499,999. • 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 2-132 .
920 .42 Hot roll fell too far below
the desired temperature
while printing. Fuser
page count between
400,000 and 499,999. • 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 2-132 .
920 .43 Hot roll too cool while
chickens for slope
change. Fuser page
count between 400,000
and 499,999. • 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 2-132 .
920 .44 Hot roll too cool when
heating to desired
temperature after slop
change. Fuser page
count between 400,000
and 499,999 • 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 2-132 .
920 .46 Fuser is not increasing
in temperature even
though the lamp has
been on for an extended
time. Fuser page count
between 400,000 and
499,999. • Fuser is not receiving AC power.
• Poor supply line voltage.
Go to “920.xx—Cold fuser service
check” on page 2-132 .
920 .47 Fuser has been below
the desired temperature
for too long while media
is in the nip. Fuser page
count between 400,000
and 499,999. • 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 temperatures
that has disrupted control.
Go to “920.xx—Cold fuser service
check” on page 2-132 .
Service error codes (9xx.xx) (continued)
Error
code Sub
codes
Display text Description Action