Transistor orientation - check
(writing on transistor front, single dot on transistor back)
Heater wiring - check
(Negative to pin 5)
Old board - check
The BIG DIFFERENCE is that the large MJE350 transistor is reversed between the boards. Coupled with the different transistors, this can be confusing - be careful there!!! If you look carefully, you will see that the three terminals of the transistor are labeled E, C, and B on the board, and they are reversed between the boards. Tiny print, hard to see!
Here's a map, going clockwise from the O terminal (which is the C4S output, in case you wondered) around the "A" end:
old board new board
O OA
I IA
- (-reg)
K Kreg
- -reg
+ breg connected to rreg
G bA
Of course for the PJCCS you only use the I, O, and G connections; the rest are for the shunt regulator function which is not used.
Good thing I read through this as the current board would have the backs of the transistors facing out, but the former board would have the backs of the transistors facing in if I'm reading this right. I've populated my board up to this point, so rather than desolder and try to salvage parts, I'm going to call for a replacement board and components. Grrrr.
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