Re: mercotronic mdl 9800 tester.

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April 5, 2015 at 7:21 am #13360
debe
Participant

    Went to post pictures & you email address doesn’t seem to work. So the most likely part that’s faulty will be the NE555 IC, check P8 on the IC it should have +5v DC on it, if it does then replace it they are cheep about $1 ea.