I've taken a bit of a step back and looked at the other threads on this unit and sim. It seems I also am looking at some trouble on A19, though different than essele. I see higher than expected voltages on the unregulated rails on there:
- TP1: +39V
- TP3: -40.5V
- TP4: +9.4V
- TP5: +9.9V
I'll take the board off and look for trouble, probably recap it and get some ballsy diodes in there to allow for lower/easier dissipation, but I'm a bit unsure how unregulated supplies can be this much off. For reference, I'm measuring this with my Fluke 189.
Any recommendations on what type of diodes to use? I should have some either Schottky or soft recovery all the way to TO220.
________________________________________________________________________________________________________
Later: The hole size seems to exclude my "non-TO220" options. So, from the TO220s I have at hand, I'd probably go with either VT5202 (5A/200V), or STPSC110065D (10A/650V) or MBRF10200 (10A/200V), all Schottkys.
________________________________________________________________________________________________________
Even later: In case anyone's wondering, I didn't check for ripple to explain the values above. It's all apart now, so I'm just going to proceed with the recap and... "rediod?..."
![Roll Eyes ::)](https://www.eevblog.com/forum/Smileys/default/rolleyes.gif)
and rebuild this board. Should probably also see if any of the resistors has drifted.