HP Ew2400 - JetDirect Print Server Administrator's Manual page 192

3. Does a 40 ERROR appear on the printer's control panel display?
The HP Jetdirect print server detected a break in the data
communications. When this error occurs, the printer
goes offline.
A break in communications may result from the physical
network connection being disrupted or the server going down.
If your printer has an Auto Continue feature that is disabled or
off, you must press the appropriate key (Start or
Pause/Resume, for example) on the printer after the
communications problem is solved to put the printer back
online. Turning the Auto Continue feature on forces the printer
to reconnect without user intervention. However, this does not
solve the disconnect problem.
4. Does an initializing (INIT) message appear on the display?
This is a normal message. Wait about 3 minutes for the message
to clear, or another message to appear. If another message
appears, see the printer's documentation and configuration
pages for additional information.
5. Does a message other than READY or the messages listed in this
section appear on the display?
See your printer documentation for a complete list of control
panel messages and corrective actions.
ENWW
Troubleshooting the HP Jetdirect Print Server 192