Control panel message Description Recommended action
NOTE 54.XX ERROR errors are
usually related to toner and print
cartridge sensor problems.
XX
●
18 = black toner level sensor
malfunction
3. Make sure that you are not using a
refilled HP print cartridge.
4. Replace the printer cartridge.
55.XX DC CONTROLLER ERROR To
continue turn off then on
The print engine is not communicating with
the formatter.
XX
●
00 = communication error
●
01 = dc controller memory error
●
01 incoming parity error
●
02 = outgoing parity order
●
03 = no engine response
●
04 = communications timeout
●
06 = dc controller NVRAM abnormal
read/write or not accessible
NOTE Check the Event log to
distinguish between the two 55.01
errors above.
Turn the device off, and then turn the device
on.
Reseat all connectors on the dc controller and
the formatter.
Reseat the formatter.
Check with HP support to find out if an
applicable RFU is available. If it is, perform a
RFU.
If the error persists, replace the dc controller.
See
DC controller PCA on page 357.
If the error persists, replace the formatter.
See
Formatter cover and cage on page 199.
56.XX ERROR To continue turn off then
on
A temporary printing error has occurred.
●
56.01 = unknown input device, selected
media input unavailable
●
56.02 = unknown output device,
selected media output bin unavailable
1. Turn the device off, and then turn the
device on.
2. For 56.01 errors, check the connections
to the input device (optional 1 x 500- or
3 x 500-sheet feeder.) For 56.02 errors,
check the connections to the optional
stapler stacker.
3. Remove all non-HP paper-handling
devices.
4. Perform a RFU.
Table 6-2 Control-panel messages (continued)
426 Chapter 6 Troubleshooting ENWW
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