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8648 series motherboard

Question asked by sreaves on Feb 2, 2016
Hello,

I have a unit where the electrical resistance across the backup battery connection (with the battery removed of course!) measures 44K ohms. At 3V this translates to 68uA which seems high. Does anyone have a copy of the schematic of the backup battery circuit or could confirm what I am seeing? Removing the motherboard from this instrument is quite a job and tracing this circuit on a multilayer board could be quite a challenge even with a print.

Thank you,

Sam
W3OHM  

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