E8257D/67D, E8663D PSG Signal Generators Service Guide 99
Troubleshooting
Troubleshooting Assembly–Level Problems
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
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