Hi, have one of these myself where the FSD200 blew it's top, taking out the supply diode D306 and feed print. Mine now has it's 5v supply back but now't else but, the power-on signal is toggling OK. Checked your diode ZD104 as a 15v zener.
Does anyone have a circuit or ideas. Note that OhmSupplies do a mini and maxi kit - will go for the 'maxi' as my 5V s/by supply now seems OK
Chris Steele.