Going back to some measurements you made earlier -
Quote:
AC volts, one probe on 'X', the other probe on 'Y', voltage =16.2
DC volts, Black probe on 'W', Red probe on 'Z', voltage =7.03
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That 7.03 volts on the output of the positive voltage rectifier is not actually far short of what it should be but it's low, so something may be loading it. We'll get to that in a bit. Let's just first find out how things stand now. Sorry to take you round in circles but when things keep changing we have little choice but to go back and re-check. Can we ask you to make the following measurements again:-
Referring to the layout diagram kindly attached by AJ in post #22, please measure the DC voltage (with respect to 0V) on
-CR1 / CR2 tapered ends (which I previously marked as 'Z')
-JP1 pin 4
Electrically speaking, these are the same place / same circuit node so if they are not at exactly the same voltage there must be an open circuit or high resistance between them.
If the voltage on 'Z' has changed again and is the same as the voltage on JP1 pin 4, then it looks as though we have an intermittent fault to contend with. I suppose this is to be anticipated since we have already seen the supply present, then absent, then briefly present, then absent again.
By the way - what / where are you using for your 0V point to put the black
meter lead on when measuring voltages?