orion 225hcca

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Im wondering what wires are power and ground on this unit? Is the black wire behing the torriod ground or is the black wire that sits next to the orange wire ground or are both? and is the yellow power? also the diode is bad the 1n4002 can i replace with a 1n4003 or whats the cross on that since i dont have a 4002? And finally the power supply fets that are in it are E2889 can i replace thoose with 2n6488's?
 
sorry heres the pic of the board
 

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ok im missing a part in the amp near the remote turn on wire. it looks like some kinda cap or something. it sits next to the mpsa06 in the amp wondering if u know what this is and what do i need order to replace the missing part?? look at the orion 250 post by me and you will get the detailed pics of the 225 board any help would greatly be appericated
 
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