Control panel message Description Recommended action
55.05 Error - To continue turn off then on This Remote Firmware Upgrade (RFU)
error message occurs when an upgrade on
the firmware is being performed and
something has happened that prevented
the upgrade.
Turn the MFP off, and then turn the MFP on.
55.XX.YY DC CONTROLLER ERROR - To
Continue Turn Off Then On
The print engine is not communicating with
the formatter.
55.01.YY = Incoming parity error
55.02.YY = Outgoing parity error
55.04.YY = Communications timeout
Turn the MFP off, and then turn the MFP on.
56.X ERROR - To Continue Turn Off
Then On
The input device or output device is
unknown.
56.1 = Unknown input device
56.2 = Unknown output device
1. Turn the MFP off, and then turn the
MFP on.
2. For 56.1 errors, reinstall all of the input
devices (optional 500-sheet feeders or
the envelope feeder.) For 56.2 errors,
reinstall the output bin, the stapler/
stacker, or the 3-bin mailbox.
3. Remove all non-HP paper-handling
devices.
57.01 Error - To continue turn off then on The DC controller fan (FN104) is not
functioning.
1. Verify that the connector J66 on the
DC controller is firmly seated.
2. Listen for the fan to operate while the
MFP is initializing.
3. If the fan does not operate during the
initialization sequence, replace it.
57.03 Error - To continue turn off then on The print-cartridge fan (FN102) is not
functioning.
1. Verify that the connector J78 on the
DC controller is firmly seated.
2. Listen for the fan to operate while the
MFP is initializing.
3. If the fan does not operate during the
initialization sequence, replace it.
57.04 Error - To continue turn off then on The main fan (FN101) is not functioning. 1. Verify that connector J64 on the DC
controller is firmly seated.
2. Listen for the fan to operate while the
MFP is initializing.
3. If the fan does not operate during the
initialization sequence, replace it.
57.05 Error - To continue turn off then on The duplexing-unit fan (FN107) is not
functioning.
1. Verify that the connector J44 on the dc
controller is firmly seated.
2. Listen for the fan to operate while the
MFP is initializing.
3. If the fan does not operate during the
initialization sequence, replace the
duplex-printing unit.
Table 6-1 Control-panel messages (continued)
ENWW Control-panel messages 389
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