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Metals used in circuits can react with oxygen. It's a common and natural reaction and can cause connection problems, but the process is reversible with deoxidizing sprays which can improve the sound quality of your amplifier.
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Remove the two screws on both sides of the receiver. Keep these and the rest of the screws in a safe place.
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Remove the top screw on the back panel.
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Slide off the case to expose the internal components of the receiver.
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Carefully wipe the circuit board and its components to remove any dust.
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Lightly spray the circuit board with DeoxIT.
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Lightly spray the input and output connectors with DeoxIT on the inside of the back panel.
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Cal Poly, Team 27-92, Amido Spring 2010 crwdns2935289:0Cal Poly, Team 27-92, Amido Spring 2010crwdne2935289:0
CPSU-AMIDO-S10S27G92
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As an electronic repair technician I would never advise spraying deoxit on a circuit board or removing dust with a papertowel. May I suggest using a can of compressed air to remove any dust inside the unit and focusing the use of contact cleaner on potentiometers, input/output jacks, sockets/plugs etc. Cleaning the top of the circuit board will do little to nothing to improve the performance or sound of your amplifier as you will simply be cleaning the top side of components that are physically soldered to pads on the other side of the PCB.
A soft long bristle brush
