Instruction manual

100 Chapter 4

Troubleshooting

Troubleshooting Using Diagnostic Test

The Agilent E5061A/E5062A has an diagnostic test function to diagnose the analog

measurement section and internal dc power supply voltages. The diagnostic test makes it

possible to isolate a faulty board assembly. The following paragraphs describe the

procedure to perform the diagnostic test.

Power On Self Test

Power-on self-test always takes place once the E5061A/E5062A is turned on. When a

failure is detected, a message "Power on self test failed" is displayed. The content of the

power-on self-test is the same as a part of the diagnostic test program and includes the dc

power supply voltage, source PLL synthesizer and level controller (ALC) tests. When the

self-test failed, perform the diagnostic test to break down into the individual tests and

narrow down failure possibilities.

NOTE The following procedure can be used to restart the power-on self test as required.

a. Press key.

b. Click

Service Menu and, then, Test Menu in the softkeys.

c. Click

Power On Test to restart the test. Wait until the power-on test ends.

d. The test result (OK or Failed) is displayed in the Power On Test key.

PLL unlock

When a PLL of the frequency synthesizers is unlocked, not the "Power on self test failed"

but "Phase lock loop unlocked" message is displayed. If it occurs, A1 Source board may be

faulty.

Contents of the diagnostic test

The diagnostic test contains 10 test groups shown in Table 4-1. Each test group can be

performed independently and verifies one of various operating characteristics of the analog

measurement section.

Table 4-1 Diagnostic test group menu

1 A1 Board DC-BUS Test

2 A2 Board DC-BUS Test

3 A1 Board Internal Level Monitor Test

4 A2 Board Internal Level Monitor Test

5 Source Power Accuracy (Step Attenuator) Test

6 Source Power linearity (Power sweep) Test

7 Receiver Absolute Gain Test