Pioneer XRP640 Fault

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Hi All, i have this bloody unit in for repair with the following fault.
It had FU2 fuse blown.
Traced it back to the output board and found D7526 S/C.
Replaced but fault remained.Checked all components and all rest ok.This unit
has 2 boards with a fan in between.Regulation board is ok unit works with
output board disconnected.
I cannot find cause of this fuse blowing .Has anyone seen this before or has
any suggestions.
Cheers
Joe



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