HP-65 1333A02242 display missing all the decimal dots
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11-10-2020, 01:54 PM
Post: #28
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RE: HP-65 1333A02242 display missing all the decimal dots
(11-10-2020 01:35 PM)albertofenini Wrote: I got it now ... Electrically wise, same points. Yes, there could indeed be a fault inside the anode driver. Hopefully testing the coil, solder connections and PCB traces for the decimal point will confirm this or a fault on the board. From your wave forms for 0.00 I would expect the same activity on segments a b c d e f, with no activity on g except for noise. Segment h (I would expect) should have similar activity to the g segment but, with a higher pulse once per display refresh indicating the decimal point. I cannot say for sure without being home to test myself. cheers Tony |
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