HMV STEREOMASTER 2018 - Potentiometer Disassembly & Clean
In this video I remove the potentiometers from the small metal chassis holding the controls on the front of the HMV STEREOMASTER 2018. I scrub/rub the metal casing with a fibre pen to remove oxidation and clean the internal of the potentiometer using switch/contact cleaner. The resistive track is soaked in contact cleaner and the wiper being move back and forth help rejuvenate the (pot) eliminating the scratchy, crackling and dead spots. Sometime this does not fix the issue and a replacement potentiometer is required.
Schematic: ERT Service Chart 1572
On/Off Switch: Schematic Ref: S3A & S3B
Volume: Schematic Ref: 166, 20k Logarithmic
Bass: Schematic Ref: 163, 20k Logarithmic
Treble: Schematic Ref: 162, 500k
Stereo/Mono Selector: Schematic Ref: S2
Radio/Tape/Gram Selector: Schematic Ref: S1A & S1B
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