Trouble: Weak transmit audio, deviation below the specifications, high end
of the speech spectrum missing.
Tools needed: A good soldering iron with a sharp tip, desoldering braid,
solder, sharp-nosed pliers, small cross-point screwdrivers.
Cure:
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Open the radio case following the instructions in the owner's manual (p. 45).
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In radios fitted with the UT-63 board, pull out the board.
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Unscrew the two small screws holding the tin plate against the bottom ends of the band modules. Pull out the plate.
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Pull out the band modules.
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Now you see the microfone fitted to the mother board. It should fit
neatly against the inside of the fascia panel. If it doesn't, carry on.
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Unsolder the microphone leads from the mother board. BE CAREFUL not
to overheat the board and the wire insulation.
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Pull out the microphone and the rubber gasket.
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Re-install the gasket. Pull in the microphone so that it fits inside
the gasket well and press it firmly to the end.
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Re-solder the mic wires.
Install the band modules, the tin plate and don't forget the screws.
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Replace the rear panel.
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Tighten the 7 screws.
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Test the audio response.
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