HP-65 1333A02242 display missing all the decimal dots

[albertofenini]

I got it now ...
the value we should look for is not between the PIN 18 (h segment) and the PIN 11 (Vbsw) of the Anode driver
instead between the 3rd pin and the 5th pin of the left coil "chip"

I thought you meant that something INSIDE the anode driver about the h segment was open and not driving current to the decimal point ...

Is the waveform for that segment good then ?

I'm asking because the display was showing some 0s, in a 0 the g segment is obviously off,
so we were expecting a flat line as waveform for that segment, while in reality it was not flat ...

Thanks again !

(11-10-2020 01:22 PM)teenix Wrote:  

(11-10-2020 01:20 PM)albertofenini Wrote:  Tony,
to measure the possibly open coil for the dot,
do we need to take the anode driver out or can we do it with anode driver soldered in place ?
Thanks again !

Measuring across those points should be a low ohms value because of the low resistance of the coil. I don't know exactly because I haven't measured it.

If in doubt, the coil pack can be removed and then measured.

cheers

Tony