E8257D/67D, E8663D PSG Signal Generators Service Guide 65
Troubleshooting
Troubleshooting Assembly–Level Problems
Before proceeding to the reported self–test error code, check the following
voltages. If any are out of specification, troubleshoot the supply problem first.
A9 YIG Driver Output Voltages
If any of the following voltages are out of specification, replace the A9 YIG
Driver:
600 Post Regulator
— Replace the A9 YIG Driver.
601 DACs
— Replace the A9 YIG Driver.
602 PLL Interface
1. Remove the cable that goes from the A5 Sampler to J4 on the A9 YIG
Driver.
2. Loop self–test 602, and use an oscilloscope to measure the voltage on J4.
The voltage should pulse to +10 Vdc.
— If the voltage is +10 Vdc, replace the A9 YIG Driver.
— If the voltage on J4 is bad, replace the A5 Sampler.
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin
+32 P112–6 +31.04 +32.96 Main Supply
+15 P112–5, 30 +14.55 +15.45 Main Supply
–15 P112–4, 29 –14.55 –15.45 Main Supply
+5.2 P112–3, 28 +5.04 +5.37 Main Supply
+10 P112–15, 16, 40 +10 +10.4 Main Supply
–7 P112–11, 12, 13, 14, 38 –6.86 –7.14 Main Supply
+5.2 Digital high P111–64, 65, 129, 130 +5.04 +5.36 Main Supply
+3.4 Digital Low P111–60, 61, 62, 63, 125, 126, 127, 128 +3.29 +3.5 Main Supply
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
+9 P112–17, 18, 42 +8.82 +9.18
–5.2 P112–1, 2, 26, 27 –5.1 –5.3
–6 P112–19, 44 –5.88 –6.12
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