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Old 13th Sep 2017, 9:18 pm   #10
Colourstar
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Join Date: Feb 2006
Location: Ilkeston, Derbyshire, UK.
Posts: 1,397
Default RGD RP231 Revisited

After a lengthy hiatus I've only just got round to fitting the replacement trimmers to this tr*ns*storized record player. With two digital multimeters I set the trimmers to give approx 12mv across R22 and R23 as suggested by Mike (Crackle).

The amp sounded reasonable but after a short while a nasty niff reached my nostrils and I discovered that the secondary winding on the motor was cooking up and had become too hot to touch. In common with several other record players, this supples a voltage which is rectified to provide a DC supply for the amplifier.

Even with the amp supply disconnected the winding still heats up. Out of interest I measured the resistance of the winding. It reads 4.6 ohms against the 3 ohms stated in the service info. Does the evidence suggest shorted turns?

Steve
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