If it hums a second and then blows the fuse or blows the fuse instantly upon power up , chances are that the rectifier diodes are shot. Generally it's an easy fix but what caused the diodes to short may be another story. could have been just a power line voltage surge like what happens when the power flashes during a storm. If that's the case then it should be fairly simple and inexpensive.
On the other hand there are several other components that could cause the rectifier to go out like a faulty regulator, also an easy fix but if the regulator surged the output transistors on it's way out then the repair could get costly.
if you open up the case look close to where the power fuse is there should be 5 +/ - round black diodes with a white or silver stripe on the end. ( Just one end ) Sometimes if they suffer a violent death they will either exibit signs of their demise such as a burnt smell, char around the circut board and sometimes even cracks or pieces blown out. but not always. If you're going to attempt replacing them yourself be damn sure to note which way the stripes are pointed one wrong placement and you will fry them again or worse fry something that wasn't fried before.
Oh yeah, Unplugging it first would be a good idea also :rollside:
BTW you can check the diodes with a multimeter for continuity they should pass current one way but not the other. you may have to pull one leg of the diode up out of the circut to check it.
Unplug it first
Dont ask me why I keep telling you to unplug it :220v: if you forget and it bites you , chances are that burning smell you smell is yer noodle cookin.
C.T. :wink: