Quote:
Originally Posted by NikPrice
I managed to get the TMS1000NLC from ebay, the seller was in Germany.
I'm going to remove the zener and test it. I'm not sure that I understand the way it is supposed to work in this circuit. I thought that it should create a 6.2V difference from one side to the other. It's not doing this, and nor does D26, which is a 7.5V zener.
If REF H is supposed to be 8.2V then I think I need to find the source of REF H and follow this through to D24. Changing the op-amp chip IC5 made no difference so I'm guessing that REF H is out of spec before that.
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Yes but it’s the wrong type for the FM4. I’ve seen it too. The source of your problems? What happens if you pull it out?
Have you tested you 6.2 V zener then?