Pioneer SX-990 Receiver Problem

rudes

Member
Hey Guys,

Turned on my receiver and the power supply fuse blew. I replaced it and it blew again. I disconnected the power transformer from the PS board to make sure the transformer was OK. Turned it on and fuse was OK. I reconnected the transformer to the PS board, but disconnected all other PS wires going to the rest of the receiver from that board. I slowly turned on the receiver with a variac and one of the rectifier diodes exploded. I have never seen a diode explode. Any ideas what happened?
 
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