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80 Chapter 3

Troubleshooting

Manual Troubleshooting Procedures (Step 4)

Reference, A2A23, Verification

1. Turn the Test Set off and re-install the Reference assembly.

2. Use screwdrivers to remove the Receiver Synthesizer (A2A22)

assembly.

3. Turn the Test Set on and verify that a 1 MHz signal of

approximately

−1 dBm is present on pin 3 of J21. This is the

reference signal from the Reference assembly.

4. If the 1 MHz signal is not present, then the Reference assembly is

probably faulty.

It is also possible that an open or shorted trace on the motherboard

assembly exists. Check the motherboard for continuity between J21 pin

3 under the Receiver Synthesizer A2A22 assembly and J18 pin 2 under

the Reference assembly, and verify that the trace is not shorted to

ground.

Receiver Synthesizer, A2A22, Unlocked

If the 1 MHz signal is present on pin 3 of J21, then the Receiver

Synthesizer assembly is faulty.

Signal Generator Synthesizer, A2A25, Unlocked

1. Turn the Test Set off and use screwdrivers to remove the Signal

Generator Synthesizer assembly.

2. If the signal is present, then the Signal Generator Synthesizer

assembly is faulty.

3. Turn the Test Set on and verify that a 1 MHz signal of about

−20

dBm is present on pin 3 of J12. This is the reference signal from the

Reference (A2A23) assembly.

If the 1 MHz signal is not present, then the Reference (A2A23)

assembly is probably faulty.

It is also possible that an open or shorted trace on the Motherboard

(A2A1) assembly exists. Check the motherboard for continuity between

J12 pin 3 (under the Signal Generator Synthesizer assembly) and J34

pin 1 (under the Reference, A2A23, assembly), and verify that the trace

is not shorted to ground.

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Agilent Technologies 8935 Series Spezifikationen Seite 81