Keysight N5221A Service Manual page 103

2-port and 4-port pna microwave network analyzers (10 mhz - 13.5 ghz) (10 mhz - 26.5 ghz)
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PNA Series Microwave Network Analyzers
Troubleshooting
N5221A/22A
Measurement System Troubleshooting
Figure 4-6
EEPROM Header Info Dialog Window
Error Messages
SOURCE UNLEVELED: The source ALC circuit on the A19 test set motherboard is running open-loop. Check
the cable connections for the A21 HMA26.5 and the A19 test set motherboard.
Service Guide N5222-90001
4-25

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N5222a

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