1. Instrument Model
Keysight/Agilent 8722ES Network Analyzer
Fault phenomenon
Self-test error: phase lock CAL failed
Testing process
After testing, it was found that the instrument reported an error after being turned on, the phase was lost, many components of the power control board and RF control board were desoldered, and it had been repaired with poor workmanship. The power control board was damaged, and the RF control board was damaged.
Repair process
After confirming the fault, the engineer replaced the damaged components of the power control board, replaced the damaged components of the RF control board, and adjusted the detection equipment.
5. Repair results
The instrument self-checked and self-calibrated normally, and the repair was completed.
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