Q816 top leg 0v
Bottom Left leg 6.9v
Bottom Right leg 12.8v
Q817 top leg 12.9v
Bottom Left leg 6.9v
Bottom Right leg 12.8v
Bottom Left leg 6.9v
Bottom Right leg 12.8v
Q817 top leg 12.9v
Bottom Left leg 6.9v
Bottom Right leg 12.8v
The PS FETs have failed. It's likely that the gate resistors have failed as well.
Remove the PS FETs and then check the gate resistors.
Remove the PS FETs and then check the gate resistors.
Thank you Perry you were spot on.
The PS fets are obscured by 4 large capacitors so no damage was visible and there were no other signs of failure. I pulled all 6 fets and Q825 had exploded.
The gate resistors measure between 100 and 99 ohm
Power supply fets are ndp6060
The PS fets are obscured by 4 large capacitors so no damage was visible and there were no other signs of failure. I pulled all 6 fets and Q825 had exploded.
The gate resistors measure between 100 and 99 ohm
Power supply fets are ndp6060
The Z44N should work with the 100 ohm gate resistors.
The 3205s would require replacing the gate resistors. 47 ohm resistors are commonly used with 3205s.
The 3205s would require replacing the gate resistors. 47 ohm resistors are commonly used with 3205s.
Hi Perry the IRF744n's read 0 ohms from centre leg to the heatsink they're fixed to. Is this OK?
Reason I ask is the securing screws have a nylon washer and the Z44's are thermally insulated from the heatsink so just want to be sure before powering up.
Thanks
Thanks