E8257D/67D, E8663D PSG Signal Generators Service Guide 97
Troubleshooting
Troubleshooting Assembly–Level Problems
Self–Tests 24xx: A38 Lowband Filter 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.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+32 P142–4 +31.04 +32.96 Main Supply
+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
+2.6 P141–57, 58, 59,
123, 124
+2.52 +2.68 Main Supply
+1.8 P141–55, 56, 120,
121
–1.75 –1.85 Motherboard
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