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There is an audio muting transistor mounted on a terminal strip at the top of the tuner mounting assembly just above the VHF tuner. It depends on an negative and positive voltage to work correctly, it's also connected to the tuner programming switches. If you disconnect the motors it may be necessary to disable this muting circuit. There's a small coil (it looks like a carbon resistor) connected to the terminal strip and the volume control terminal, just disconnect one end of the coil.
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