E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-31
Self–Tests 2xx: A5 Sampler 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.
200 Power Supply
1. If the supply voltages are good on the connector pins indicated, replace the A5 Sampler.
2. If the supply voltages are bad on any of the connector pins indicated, check the origin of the supply.
3. If the supply voltages are good at the origin, replace the A31 Motherboard.
4. If the supply voltages are bad at the origin, troubleshoot the problem using that assembly’s troubleshooting
procedure.
201 Tuning + Bias Test
1. Turn power off and remove the A5 Sampler and connect a signal analyzer to the A5 Sampler J1 input cable on the
A31 Motherboard.
2. Turn the signal generator on and check for the presence of a 1 GHz signal at the level of 0 dBm.
3. If the signal is good on the cable connector J1, replace the A5 Sampler.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+32 P22–7 +31.04 +32.96 Main Supply
+15 P22–6, 21 +14.55 +15.45 Main Supply
–15 P22–2, 17 –14.55 –15.45 Main Supply
+5.2 P22–14, 29 +5.04 +5.37 Main Supply
+9 P22–5, 20 +8.82 +9.18 YIG Driver
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