Macintosh Classic Analog board blowing fuse and mosfet IRFBC40

[techknight]

yes as well as having built-in circuitry for dead-time control, under-voltage/over-voltage/over-current lockout, and the oscillator. 

 

[bibilit]

Ok, many thanks, from the information collected, supply voltage should be around 10 volts ?

 

[Ferrix97]

Yes, there's a slight dip at around 9V when the IC starts working (if you measure while connected to a variac).

But before staring to measure the IC, I'll change the poly cap and the fusible resistor first

 

[bibilit]

Ok, thanks, will order parts this week, don't have any spare except for the TDA4605.