Agilent Technologies E3634A Troubleshooting Hints, Unit is Inoperative, Unit Fails Self-Test

C a u t i o n

Chapter 5 Service

Troubleshooting Hints

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.

This instrument contains CMOS integrated circuits which are susceptible to failure due to electrostatic discharge. Refer to the ‘‘Electrostatic Discharge (ESD) Precautions’’ section earlier in this chapter for further handling precautions.

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 6.3 AT, 250 V fuse for 100 or 115 Vac operation.

Use the 3.15 AT, 250 V fuse for 230 Vac operation.

Verify the power-line voltage setting.

See ‘‘To prepare the power supply for use’’ on page 23.

Unit Reports Errors 740 to 750

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 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 DAC U22 on the PC board will cause many self-test failures.

102