Control panel message Description Recommended action
49.XXXXX ERROR To continue turn off
then on
A critical firmware error has occurred. 1. Turn the device off, and then turn the
device on.
2. Go to
www.hp.com/support/
LJM3027mfp or www.hp.com/support/
LJM3035mfp to check the latest
firmware image version. If the latest
firmware image version is newer than
the one installed on the device, upgrade
the device.
3. Try printing a job from a different
software program. If the job prints, go
back to the first program and try printing
a different file. If the message appears
only with a certain software program or
print job, then the error is in the software
program and not in the device. If the job
fails to print using a different software
program, then turn off the device and
disconnect all cables that connect the
device to the network or to a computer.
4. Remove any DIMMs and EIO cards, and
then turn the device on.
5. If, after removing DIMMs and EIO cards,
the device behaves normally, turn off
the device and reinstall DIMMs and EIO
cards one-by-one, turning off the device
off and then on again each time you
reinstall a DIMM or EIO card. If a certain
DIMM or EIO card causes the message
to reappear, replace the DIMM or EIO
card.
6. Reconnect all cables that connect the
device to the network or to a computer.
7. If the message persists, replace the
formatter (see
Formatter on page 116).
50.1 FUSER ERROR AC power is not being provided to the fuser
assembly. AC voltage is necessary to
generate heat in the fuser assembly.
1. Verify that the connection between the
fuser assembly and the ECU is fully
seated.
2. If the message persists, replace the
fuser assembly.
50.6 FUSER ERROR The main or sub thermistors are unable to
provide temperature feedback to the ECU.
The main and sub thermistors monitor the
fuser assembly hot-roller temperature and
provide feedback to regulate the fusing
temperature.
1. Verify that the seven-wire connector is
firmly seated in connector J405 on the
ECU. You might have to remove the
main cooling fan to see this connection.
2. Verify that the four-wire connector is
firmly seated in the fuser assembly.
3. Verify that the AC voltage is being
provided to the fuser assembly.
4. If the message persists, replace the
fuser assembly.
Table 6-1 Control-panel messages (continued)
ENWW Control-panel messages 205
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