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Tracing fault on FM tuner
Tracing fault on FM tuner
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Old 16th July 2012, 11:57 PM   #1
gck303 is offline gck303  United Kingdom
diyAudio Member
Join Date: Jun 2012
Default 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.
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Old 17th July 2012, 10:37 AM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
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.
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Old 17th July 2012, 01:06 PM   #3
stellavox is offline stellavox  United States
diyAudio Member
Join Date: Jan 2007
Location: Oneonta, NY; USA
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?

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