8 Service and Maintenance
194 E364xA User’s and Service Guide
Troubleshooting Hints
This section provides a brief checklist 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 the 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 U131
[1]
on the PC board will cause many self-test failures.
Bias supplies problems
Check that the input to the voltage regulators of the bias supplies is at least 1 V
greater than their output. Circuit failures can cause heavy loads of the bias
supplies which may pull down the regulator output voltages. Check the voltages
of the bias supplies as tabulated in Table 8-1.
[1] For serial MY53xx6xxx, DAC U12 or U15 for E3640A/E3642A/E3644A, or U16 for E3641A/E3643A/
E3645A.
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