Performance Failure Troubleshooting; Adjustment Failure Troubleshooting - Keysight E4990A Troubleshooting Manual

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Troubleshooting

Performance failure Troubleshooting

Adjustment failure Troubleshooting

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Table 4 shows the recommended replacement board when the
performance test fails even after adjustment.
Table 3 Recommended replacement board for performance test 
failure
Failed Adjustment item
Signal Frequency Accuracy
Signal Level Monitor Accuracy
Signal Level Accuracy
DC Bias Level Monitor Accuracy
DC Bias Level Accuracy
Z Measurement Accuracy
(**: most suspicious, *: suspicious)
Table 4 shows the recommended replacement board when the
adjustment fails.
Table 4 Recommended replacement board for adjustment failure
Failed Adjustment item
10MHz Reference Frequency
Clock Level
DC Bias Level
TRD MODEM ADC DC Offset
TRD MUX DC Offset
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Impedance Analyzer
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