HP 85106D, Manual

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HP 85106D mm-Wave System 4-1
4
Service and Troubleshooting
Introduction
Use this section to troubleshoot an HP 85106D factory-configured system to
the instrument level. When the faulty instrument is located, continue
troubleshooting, following the troubleshooting procedure documentation
for that product to locate the faulty instrument assembly.
WARNING
Each instrument in the HP 8510C system contains lethal voltages when the
instrument has ac power applied. Refer to the safety information included in
the "Safety/Licensing" section of the
HP 851OC Network Analyzer On-Site
Service Manual, which is included with each HP 85106D system. Servicing
must be performed by qualified personnel only.
Troubleshooting
Strategy
System troubleshooting is carried out in the following three stages:
1. Completing a pre-operational check to quickly identify selected failures.
This check includes verifying that the system is cabled correctly, that the
correct firmware revision is loaded, the HP-IB addresses are correct,
voltages are correct, and configuration and language switch settings are
correct.
2. Running the HP 8510C internal diagnostics to determine if the network
analyzer is functioning.
3. Using specific procedures to find certain obvious symptomatic failures.
Hardware service tools are used to emulate source and test set functions,
and to identify a cause of failure outside the analyzer.
The HP 8510 network analyzer is the core instrument around which the
HP 8510C system is built. The HP 8510 internal diagnostics check operation
of the analyzer during initial application of ac line power and continuously
while the instrument is running. The faulty system component can be
isolated most effectively when these diagnostics are used to confirm or deny
HP 8510C operation.
During the pre-operational check, note any failure indications before you
begin troubleshooting. These indications may be self-test failure messages,
running error messages (caution type), measurement errors, performance
test problems, or display hang-ups. Continue following the procedure;
failure indicators are discussed as they apply to the process. Refer to the
system block diagrams in Figure 4-1 on page 4-2, and Figure 4-2 on
page 4-3, as needed for troubleshooting.