E8257D/67D, E8663D PSG Signal Generators Service Guide 123
Troubleshooting
Troubleshooting the RF Path
2. From Table 1-21, determine the frequencies where the problem occurs.
3. Perform the following steps:
— press Preset
— press Frequency, and set signal generator to frequency in problem
area
— press Amplitude, and set to +25 dBm
— press RF ON/OFF (turn RF On)
— turn ALC Off
— Power Search Manual
— Do Power Search
4. Using the RF Path Block Diagram, check the power levels at the points
shown.
5. Once the problem is located, verify that the cables between the two
assemblies are good before replacing the assembly.
Table 1-21
Frequencies Assemblies
All frequencies A27 40 GHz Doubler (40 GHz models only)
A28 YIG Oscillator
A29 20 GHz Doubler
A30 Modulation Filter
AT1 (Option 1E1)
RF Output Connector
250 kHz to 2 GHz A6 Frac–N
A8 Output
A27 40 GHz Doubler
A29 20 GHz Doubler
A30 Modulation Filter
A25 Highband Coupler/Detector
AT1 (Option 1E1)
RF Output Connector
250 kHz to 20 GHz A23 Lowband Coupler/Detector
A8 Output
3.2 GHz to 20 GHz/40 GHz A27 40 GHz Doubler (40 GHz models only)
A29 20 GHz Doubler
A30 Modulation Filter
AT1 (Option 1E1)
RF Output Connector
20 GHz to 40 GHz A25 Highband Coupler/Detector
A27 40 GHz Doubler
A30 Modulation Filter
AT1 (Option 1E1)
RF Output Connector
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