Keysight Technologies E8257D - Self-Tests 3 Xx: A7 Reference (Standard) Self-Test Errors (for Instruments with Serial Prefixes < US4805;MY4805)

60 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
Self–Tests 3xx: A7 Reference (Standard) Self–Test Errors (For
instruments with serial prefixes < US4805/MY4805)
Before proceeding to the reported self–test error code, check the following
voltages. If any of the voltages are out of specification, troubleshoot the supply
problem first.
300 1 GHz Detector
1. Check and remove any connection to the 10 MHz external reference on the
rear panel.
2. If the signal generator continues to fail self–test, replace the A7
Reference.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+32 P102–7 +31.04 +32.96 Main Supply
+15 P102–6, 21 +14.55 +15.45 Main Supply
–15 P102–2, 17 –14.55 –15.45 Main Supply
+5.2 P102–14, 29 +5.04 +5.37 Main Supply
+9 P102–5, 20 +8.82 +9.18 YIG Driver