E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-34
Self–Tests 4xx: A8 Output Self–Test Errors (E8267D only)
Before proceeding to the reported self–test error code, check the following voltages. If any voltages are out of
specification, troubleshoot the supply problem first.
400 Lowband Ground and PTAT Test
• Replace A8 Output.
401 Prelevel Loop Test
1. With the signal generator powered up, carefully remove the A8 Output.
2. Set the signal generator to 3 GHz CW.
3. Using a spectrum analyzer measure the A6 Frac–N RF output at J4 of the A8 Output.
The signal at J4 should be at 3 GHz and ≥0 dBm.
• If the signal is not present, or is not at the correct level, replace the A6 Frac–N.
• If the signal is present, replace the A8 Output.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+15 P52–6, 21 +14.55 +15.45 Main Supply
−15 P52–2, 17 −15.45 −14.55 Main Supply
+5.2 P52–14, 29 +5.04 +5.36 Main Supply
+9 P52–5, 20 +8.82 +9.18 YIG Driver
−6P52–3, 18−6.12 −5.88 YIG Driver
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