When dealing with calibration failure of the Agilent 4294A impedance analyzer during repair, the following operational details should be noted: 1. Check and replace faulty components (e.g., display control board if related issues exist) and perform self-tests to confirm component functionality. 2. Conduct a full machine inspection to identify potential hidden problems. 3. Clean internal dust accumulation, as dust may affect calibration accuracy and instrument performance. 4. Perform self-calibration after repairs and verify that the instrument passes calibration with normal signal indicators.

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