Assembly Level Troubleshooting 4
Keysight 3458A Assembly-Level Repair Manual 129
Refer to the Assemblies Removal/Installation Procedures in Chapter 3 of this
manual to replace a defective assembly.
Miscellaneous failures
The following failures are those that are not detected by either the self-tests or the
performance tests.
GPIB failure (Self-test passes)
This failure is normally caused by a defective GPIB Connector. Try cleaning the
connector. If still inoperative, try replacing the Outguard Controller (A5) assembly.
Go to the Assemblies Removal/Installation Procedures in Chapter 3 of this manual
to replace the assembly.
Ext out failure
This failure can be caused by a defective cable or an inoperative isolation logic
circuitry. Note that the Ext Out function can be disabled by the “EXTOUT 0"
command. Be sure the function is enabled before troubleshooting the failure. To
enable the function, reset the instrument.
213 Optional RAM 0 High Outguard Controller A5 03458-66505
A5 03458-66515
214 Optional RAM 0 Low Outguard Controller A5 03458-66505
A5 03458-66515
214 Optional RAM 1 High Outguard Controller A5 03458-66505
A5 03458-66515
214 Optional RAM 1 Low Outguard Controller A5 03458-66505
A5 03458-66515
Table 4-2 Self-test error messages and probable causes (continued)
Error
number
Error message Probable cause
Ref
desig.
Assembly part
number
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