Keysight E3632A, Service Manual

Page: 63 / 73

Service 2
Keysight E3632A Service Guide 65
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 instrument
rather than any external connections. Also make sure that the instrument is
accurately calibrated. The power supply's circuits allow troubleshooting and
repair with basic equipment such as a digital multimeter and a 100 MHz
oscilloscope.
Unit is inoperative
– Verify that the AC power cord is connected to the power supply.
– Verify that the front-panel power switch is depressed.
– Verify that the power-line fuse is installed:
– Use the 4 AT, 250 V fuse for 100 Vac or 115 Vac operation..
– Use the 2.5 AT, 250 V fuse for 230 Vac operation..
– Verify the power-line voltage setting.
– Refer to the E3632A User’s Guide
Unit reports errors 740 to 750
These errors may be produced if you accidentally turn off power the unit during a
calibration or while changing a non-volatile state of the instrument. 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
CAUTION
This instrument contains CMOS integrated circuits which are susceptible to
failure due to electrostatic discharge. Refer to the “Electrostatic Discharge
(ESD) Precautions” on page 62 for further handling precautions.