4 Assembly Level Troubleshooting
120 Keysight 3458A Assembly-Level Repair Manual
Assembly Level Troubleshooting
3458A failures
To troubleshoot the 3458A, first determine what the failure is. Then use the
information in the following paragraphs to determine the defective assembly.
Failures can show up in a variety of ways. Some failures are obvious, like a
completely inoperative instrument or a self-test failure. Other failures may only
show up during the performance tests. Others yet will only show up under certain
conditions, like the instrument working from the front panel but not from remote,
In most cases, the 3458A failures can be separated into the following major
categories.
1 Turn-On Failures - these failures are as follows:
a 3458A Inoperative with Blank Display
b 3458A Inoperative with Unintelligible Messages in Display
c Isolator Failure
d RAM Failure
2 Self-Test Failures - these are detected during the 3458A's self-test.
3 Performance Tests Failures - these are detected during the 3458A's
performance test,
4 Miscellaneous Failures - these failures are as follows:
a GPIB Failure (Self-Test passes)
b Ext Out Failure
c Ext Trig Failure
d Fan Inoperative
e Long Term Stability Failure
Turn-on failures
These failures normally show up when the instrument is first turned on and it
attempts to go through its power-on self-test. The following paragraphs explain
these failures and how to troubleshoot them.
To Next Page
Loading...
