E8257D/67D, E8663D PSG Signal Generators Service Guide 89
Troubleshooting
Troubleshooting Assembly–Level Problems
— If the signal is good, reconnect A37–J5 and replace the A37
Upconverter.
f. For RF signals >28.5 GHz, the IF signal frequency is mixed with the
LO to produce the upconverted RF signal. The IF signal will range in
frequency from 5.73 GHz to 8.82 GHz. The LO signal will range in
frequency from 22.8 GHz to 38.2 GHz and will be four times the IF
frequency. Repeat steps a through e, but with an RF signal
>28.5 GHz.
Self–Tests 13xx: A11 Analog/Pulse Modulation Generator Self–Test
Errors
Before proceeding to the reported self–test error code, check the following
voltages. If any of these voltages are out of specification troubleshoot the
supply problem first.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+15 P132–28 +14.55 +15.45 Main Supply
–15 P132–3 –14.55 –15.45 Main Supply
+5.2 P132–2, 27 +5.04 +5.37 Main Supply
–5.2 P132–1, 26 –5.3 –5.1 YIG Driver
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