8 Service and Maintenance
Troubleshooting Hints
184 E364xA User’s and Service Guide
Troubleshooting Hints
This section provides a brief check list of common failures.
Before troubleshooting or repairing the power supply, make
sure that the failure is in the power supply rather than any
external connections. Also make sure that the power supply
is accurately calibrated. The circuits of the power supply
allow troubleshooting and repair with basic equipment such
as a 6½- digit multimeter.
Unit reports errors 740 to 755
These errors may be produced if you accidentally turn off
power of the unit during a calibration or while changing a
non- volatile state of the unit. Recalibration or resetting the
state should clear the error. If the error persists, a hardware
failure may have occurred.
Unit fails self-test
Verify that the correct power- line voltage setting is selected.
Also, ensure that all terminal connections are removed while
the self- test is performed. Failure of the DAC U20
[1]
on the
PC board will cause many self- test failures.
[1] For serial MY53xx6xxx, DAC U13 or U12 for E3646A/E3648A, or U14 for
E3647A/E3649A.
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