Keysight E8257D/67D - Troubleshooting Adjustment Problems

E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-58
Self–Tests 22xx: A8 Output Self–Test Errors
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.
2200 Ground and PTAT Test
• Replace A8 Output.
2201 Prelevel Loop Test
NOTE If the A8 Output board has been replaced recently and self test 2201 is failing, run the ALC Mod Cal
adjustment before replacing the A8 Output board. See Chapter 4, “Post–Repair Procedures.”
1. With the signal generator powered on, carefully remove the A8 Output.
2. Set the signal generator to 3 GHz CW.
3. Connect a spectrum analyzer to the A6 Frac–N RF output at J4 of the A8 Output. The signal at J4 should be at
3 GHz and ≥0 dBm.
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
–6 P52–3, 18 –6.12 –5.88 YIG Driver