OK
The voltage trimmer is good?
I will check it.
Salas SSHV2 without the CCS can regulate Vout to 280v when Vin is 340v?
Needs a ballast series power resistor if using only the parallel part. 1K-1.2K-1.5K 10W should do in your case (60mA or 50mA or 40mA flow).
I think of no reason than some practical error not to work when having a limiting resistor.
Also:
"Another test tip is, as the circuit is off power, Q5 between E,B pins on Ohm meter with red probe on E should be reading in the hundreds of Ohm and changing reading when turning the R11 trimmer. When a blown Q5 could read a couple of Ohm near short. Q4 should be reading in the hundreds of kilo Ohm on same test probing (the trimmer is not involved in Q4)."
Also:
"Another test tip is, as the circuit is off power, Q5 between E,B pins on Ohm meter with red probe on E should be reading in the hundreds of Ohm and changing reading when turning the R11 trimmer. When a blown Q5 could read a couple of Ohm near short. Q4 should be reading in the hundreds of kilo Ohm on same test probing (the trimmer is not involved in Q4)."
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