HP 3000 Manuals

Troubleshooting Terminal, Printer, and Serial Device Connections

Troubleshooting Pathway 

A practiced method for problem resolution is to first identify the
problem and then identify alternative causes of that problem.  Break the
big problem into smaller, more manageable components.  By breaking the
problem into manageable and testable components, the cause can be easily
isolated.  A recommended troubleshooting pathway is shown in figure 2-1.


          Figure 2-1.  Troubleshooting Pathway 

Each of the numbered circles is a task used to troubleshoot problems in
networking environments.  By completing these tasks, isolation of the
cause of the problem is likely to occur; this is the most difficult part
of troubleshooting.  After the cause of the problem has been identified,
take an appropriate action to resolve the problem.  Each task is
described below.

   1.  Troubleshooting at the Device.  First, do some simple
       verifications at the device.  This can rule out causes such as
       improper device settings and loose connections.  Simple
       observations can also indicate if the problem is system-wide.  The
       verifications require no particular expertise; they are
       appropriate for general users.  After this, it will be clear if
       more detailed device, DTC, or LAN testing is needed.

   2.  Testing DTC-Device Connections.  If necessary, use TermDSM for
       more detailed diagnostics.  This must be done at another device or
       the console.  Test DTC-device connections first.  This can detect
       faults within the device, the device cable, and parts of the DTC
       circuitry.  If DTC-device connections are not causing the problem,
       further DTC diagnostics are suggested.

   3.  Testing the DTC. Using TermDSM, perform a DTC selftest.  The
       selftest can detect faults within specific field replaceable units
       (FRU) of the DTC. If the DTC passes the selftest, the fault might
       be in the LAN. Proceed with LAN diagnostics.

   4.  Testing the LAN. LAN troubleshooting is beyond the scope of this
       manual.  It generally requires special tools and the expertise of
       an HP support representative.

Procedures to follow for the first three tasks in the troubleshooting
pathway are summarized in the pages that follow.

MPE/iX 5.0 Documentation