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I recently acquired an HP8643A.? It *SEEMS* to work ok, although admittedly I have not used it very much yet.?

On initial power on, it displays? --- Calibrating --- for a very long time… perhaps 3 minutes or so.? When the --- Calibrating --- finally goes away, it displays Hardware Failure 14 and Calibration Error 2, along with the Result Code 14.020122 *WITHOUT* a plus or minus sign in front of it.? According to the service data, a result code without a sign in front of it indicates a calibration error and require additional action to return the instrument to working condition.? I haven’t found anything on either the Hardware Failure 14 or the Calibration Error 2 in the manual yet.?

I have checked the P/S voltages and all are in tolerance and the max ripple I see is about 20 mV, although I have not seen a spec in the book for ripple.? There is *SOMETIMES* a P/S fail LED lit on the I/O board, but it always goes away.? Obvious this is suspicious, but I don’t know if it means anything or not.

I pulled the I/O board and looked down at the P/S boards and I don’t see any leaky or swollen caps.?

The Serial Number is 3512A01553 and the device has Options H02 and K01 installed.?

Any advice would be appreciated.? I spent some time getting my HP8924C’s up and running recently, so I’m not afraid to get in up to my elbows, but sure would appreciate some direction.

Mike – WM4B