To Troubleshoot Intermittent Failures - Agilent Technologies 35670A Service Manual

Caution
Troubleshooting the Analyzer

To troubleshoot intermittent failures

To troubleshoot intermittent failures
Use this test to isolate intermittent failures to the assembly.
• Determine if your intermittent failure is caused by one of the following
common causes.
Common Reasons Troubleshooting Procedure
Loose screws Check that the screws in the analyzer are tight and that the cables are
and cables firmly in their sockets. This is especially important since grounding for
the analyzer depends on the cables and screws.
Motherboard Remove each assembly connected to the Motherboard and check the
connectors connectors for loose or bent pins.
Power supply Check for correct power-supply voltages. See ''To perform initial
voltages verification'' on page 4-5.
Out-of-adjustment Do the adjustments for the analyzer in chapter 5.
Low level noise Do ''To troubleshoot distortion failures'' on page 4-56.
Air flow Cooling air enters from the right side and exhausts through the left side
restricted and rear panel. Check that the air flow was not restricted in these areas
when the failure occurred.
External voltage Verify that the line voltage is within the electrical specification for the
analyzer. See chapter 2.
• Connect the rear panel SOURCE output to the rear panel TACH input using a
BNC cable. Remove all cables from the front panel input connectors.
The ICP self test outputs approximately 30 Vdc on the input connectors. Before
starting the self tests, disconnect all devices connected to the input connectors.
Devices left connected during the ICP self test may be damaged.
• Set the power switch to on (
4-40
).
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Agilent 35670A