Keysight E8257D/67D - Self-Tests 7 Xx: A6 Frac-N Self-Test Errors

E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-39
2. If the signal is not present at J9, measure the center pin of J1032 on the motherboard.
• If the signal is present, replace the cable.
• If the signal is not present, replace the A6 Frac–N.
Self–Tests 7xx: A6 Frac–N 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.
700 Ref Voltage
• Replace the A6 Frac–N.
701 Loop Gain
• Replace the A6 Frac–N.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+32 P32–7 +31.04 +32.96 Main Supply
+15 P32–6, 21 +14.55 +15.45 Main Supply
–15 P32–2, 17 –14.55 –15.45 Main Supply
+5.2 P32–14, 29 +5.04 +5.37 Main Supply
+9 P32–5, 20 +8.82 +9.18 YIG Driver
–5.2 P32–4,19 –5.1 –5.3 YIG Driver
–6 P32–3, 18 –5.88 –6.12 YIG Driver