Sony CF-270L Audio Circuit
The Sony CF-270L printed circuit board can accumulate dust through the back grille in the case. Luckily, it has hinges on one side and swings out for servicing purposes.
PCB - Component Side
Power Output Transistors
Audio Transformer
Switch
The circuit reconfiguration switch, also known as "the long switch", reconfigures the circuit between record and playback modes. If your unit is producing feedback whistling, and crackling sounds, then this switch may require cleaning with a good electrical contact cleaner.
Potentiometers
On this unit, the tone, bass and volume potentiometers required cleaning with a contact cleaner because they were producing crackling noises.
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Sony CF-270LSony CF-270L Inside
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Sony CF-270L Mechanism
Sony CF-270L Audio Circuit
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Sony CF-270L Case
Sony CF-270L Power