Agilent 34401A Multiple Error Messages

This unit failed self-test and was throwing the following errors: 612, 613, 615, 617, 618, and 619. These errors are commonly attributed to a failing U201 chip. I replaced that chip along with some electrolytic capacitors and all self-tests passed. This 6.5 digit digital multimeter will become my primary bench DMM.

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HP 3610A Wonky Display

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ESI Model 253 Autoranging Digital Impedance Meter