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I am getting the diagnostic error code E212X (E2121+ E2122+ E2123+ E2124) on my CSA803 or 11800-series oscilloscope. What does this mean?

Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03879

Question: I am getting the diagnostic error code E212X (E2121+ E2122+ E2123+ E2124) on my CSA803 or 11800-series oscilloscope. What does this mean?

Answer: This diagnostic error code indicates a problem with the RAM for the Front Panel Controller or its associated circuitry.

Due to the age of these products, replacement parts are no longer available.