Textronix AM503B codes

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Dave,

I have plenty of the old style (pure analog) AM503's if that would help. Can't help you fixing the digital unit though.

I'll bet that battery was there to maintain calibration coefficients in RAM as this was designed before FLASH memories came into being.

🙁
 
Does it measure now? I'll bet your out of calibration...

Probably have to send it back to TEK... 🙁 There might be a couple of pins somewhere you can connect to force the unit to reload it's bios and default calibration coefficients from ROM.

Can you find a schem?
 
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