Keysight E8257D/67D - Troubleshooting the RF Path

E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-61
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.
2500 Power Supply Test
• If the power supplies, in the table above, are good, replace the A43 Amp Filter.
2501 RF Amp Test
• Replace the A43 Amp Filter.
2502 Filter Path Test
• Replace the A43 Amp Filter.
2503 Pulse Modulator Test
• Replace the A43 Amp Filter.
2504 Step Attenuator Test
• Replace the A43 Amp Filter.
2505 Divider On/Off Test
• Replace the A43 Amp Filter.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+15 P142–28 +14.55 +15.45 Main Supply
–15 P142–3 –15.45 –14.55 Main Supply
+5.2 P142–2, 27 +5.04 +5.36 Main Supply
–5.2 P142–1, 26 –5.30 –5.10 YIG Driver
+5.2 Digital High P141–64, 65, 129, 130 +5.04 +5.36 Main Supply
+3.4 Digital Low P141–60, 61, 62, 63,
125, 126, 127, 128
+3.3 +3.5 Main Supply
+10 P142, 10, 11, 36 +9.7 +10.3 Main Supply