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-   -   Tracing fault on FM tuner (http://www.diyaudio.com/forums/analogue-source/216324-tracing-fault-fm-tuner.html)

gck303 16th July 2012 11:57 PM

Tracing fault on FM tuner
 
I have a digital microprocessor controlled FM tuner.

It does not output any sound or static. Plus it won't show any signs being received from a decent room mounted aerial. The signal strength meter sits at 0 db.

What could be wrong?

Where would I got to start to try to trace this fault?

I am after a roll after giving my pre amp, so am keen to get this fault fixed too.

DF96 17th July 2012 10:37 AM

How much experience do you have of fault tracing, especially on RF circuits? What test equipment do you have?

It could be something simple like a PSU fault, or it could be something complicated. First thing is to tell us what it is, and find a circuit diagram or service manual. Fiddling around in the dark will introduce new faults.

stellavox 17th July 2012 01:06 PM

I agree with DF96. Check the power supply and see if it is outputting "correct" voltage-probably +5 and maybe +12 or higher, maybe a minus voltage also - look to see what IC regulator chips are there.

Some tuners have a muting function - maybe it's set too high and mutes everything?

Charles


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