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Old 28th Sep 2020, 7:50 pm   #2
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,526
Default Re: Sony ST242L tuner works on only half the frequency range

The program sensor doesn't do the actual tuning, that's done by the varicap diodes in the FM front end. However, they get their variable tuning voltage via that mysterious block.

Is it a sealed unit or are its components accessible?

Have you checked that the high and low limit tuning voltages fed to the program sensor are correct?
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