HP E1418A, Service Manual

Page: 74 / 96

Troubleshooting
This section will help isolate a failing assembly.
Visual Checks
Before installing or operating the module, visually inspect the rear panel
and front panel connectors for bent pins. Inspect circuit boards for evidence
of arcing or excessive heat.
If a module does not respond to commands, verify the Logical Address
setting. The HP E1418A User’s Guide describes this switch setting.
Catastrophic
Failures
If a module does not respond, verify the power fuses F1, F2, F3 and F4.
Disassembly is described beginning on page 80 and the locations of the
fuses is shown in the drawing on page 90.
Self-Test
The internal self-test can be used to isolate most failures of the module.
The major assemblies of the HP E1418A are available on an exchange
basis.
Use the following SCPI Common Command query to initiate a module
self-test.
/* Start the Self-test*/
*TST?
/* Enter the 16-bit integer returned*/
The query will return a +0 if no errors are encountered. Any return other
than +0 indicates a failure. The command returns the first test to fail,
additional failures are possible.
The
*TST?
query initiates a full self-test. You can obtain the complete test
results by using the
TEST:TST:RESults?
query. This query returns an
array of 100 integers representing the results of each self-test.
Use the following SCPI commands to initiate a self-test and obtain
complete results.
/* Start the Self-test*/
*TST?
/* Enter the 16-bit integer returned*/
/* If the returned value is not +0, send*/
74 Service Chapter 6