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I need to replace a component founded in a pioneer amplifier but i'm not sure about the purpose of the component. I linked an image. Can you help me about this?
I'm not sure where it fits on the board from those pictures unless it's U4 (just below the big heat sink).
I have tried to find a schematic for that model but failed. I suggest you contact Pioneer and request a service manual (not the owners manual) which will contain a schematic and parts list. You will probably have to go back to them with their own reference number from the parts list to get a replacement.
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