Keysight Technologies E8257D Service Manual page 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.
Supply Vol tage
(Vdc)
+15
–15
+5.2
–5.2
+5.2 Digital High
+3.4 Digital Low
+10
2500 Power Supply Test
— If the power supplies, in the table above, are good, replace the
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.
E8257D/67D, E8663D PSG Signal Generators Service Guide
Connector Pins
P142–28
P142–3
P142–2, 27
P142–1, 26
P141–64, 65, 129,
130
P141–60, 61, 62, 63,
125, 126, 127, 128
P142, 10, 11, 36
A43 Amp Filter.
Minimum Value Maximum Value
(Vdc) (Vdc)
+14.55 +15.45
–15.45 –14.55
+5.04 +5.36
–5.30 –5.10
+5.04 +5.36
+3.3 +3.5
+9.7 +10.3
Origin
Main Supply
Main Supply
Main Supply
YIG Driver
Main Supply
Main Supply
Main Supply
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