HP Designjet T Series — Service Manual 2-37
Appendix A: How to troubleshoot SE 79:04
Network related SE79:04
Most HP Designjet printers have built-in networking capabilities. Network
settings can be set manually, but in the majority of cases, they are obtained
automatically from the printer. These settings include many different fields,
such as IP address and subnet mask, available gateways, host and domain
names, etc.
In some cases, there can be issues in the firmware that can cause a certain
v
alue in one of these fields to be interpreted incorrectly, and this can lead to
a 79:04 system error.
Symptoms
There is no single set of symptoms that can absolutely pinpoint a network
r
elated 79:04 system error. However, the following guidelines can be
applied:
It can happen at start up or when accessing the Network Configuration
section of the FP
In both cases, repeating the action with the LAN cable disconnected
does not cause the 79:04 to occur
Solutions and workarounds
In the majority of cases, these issues will be due to an issue in the printer’s
f
irmware. As soon as the conditions where the issue happens can be
understood, it should be escalated to the GBU through the GCC.
At the same time, the following short term solutions and workarounds can
help
the customer to get up and running in the shortest possible time:
1 Di
sconnect the network cable to be able to boot the printer and change
network settings
2 In the Net
work configuration menu in the Front Panel, disable any protocols
that you are not using, including IPv6, SNMP and WebServices.
3 If
step “2” does not work, try setting a manual configuration of the device:
a Ent
er the correct subnet mask and an IP in the valid range
b In
the GateWay field, set the same value as in the IP address field
c Do not s
et a host name or a domain name
4 If
step “3” does not work and the customer is using the network card which
is part of the printer, try using an accessory Jetdirect card instead.
User Interaction related SE79:04
In some cases the printer may not react as expected when a certain set of
conditi
ons coincide. In these cases, if the printer doesn’t know how to react,
it may simple display a 79:04 system error and force a reboot. Some
examples (not real) that can help to illustrate this:
An error occurs when a job is cancelled when it is at the “Finishing print”
state and when the queue is disabled
An error occurs if the Window is opened while the printer is checking the
printheads
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