Question about Sharper Image SA253 CD Shelf System
This sounds major.....
The signal detection used in both radios and TV sets is via special voltage sensitive diodes which alter capacity as the voltage across the diode changes.
You actually change the voltage across the diodes as you move the tuning dial.
In your case the diode only sees one voltage and is locked to a certain station, because you are not altering the capacity to re-tune to another station...
So it appears that you have lost the ability to alter the DC voltage across the diode...
The design of the tuning knob may be where this fault lies, where the physical action of turning the tuning knob does not transfer the mechanical action to the item that changes the DC voltage to the diode....maybe you have systen that uses a long cord would around pulleys that gives you nice control over the tuning maybe its just a broken tuning cord...
Maybe the tuning is done by just a simple variable resistor I'm not familiar with this system but I have given you the bascics to start on...Unplug the cord from the AC wall socket then remove the top of the cabinet and have a look to see what moves when you turn the tuning knob it will soon become apparent if there is nothing moving when you turn the knob and thus lead you on to the problem....
Maybe the knob is just loose on its drive shaft...
Cheers From YUBEUT
Posted on Nov 24, 2007
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Posted on Jan 02, 2017
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