Hi everybody,

I'm trying to fix a stereo tuner TEAC T-X120 I've received from a friend of
mine,
this tuner shows issues when in FM:

1. The automaic search of the FM radio stations seems not to work, you can
eventually
start it, the receivers seems to run thru the FM frequencies, but no station
found/tuned.

2. You can tune manually a radio station only in MONO, if you try to switch
to STEREO
the receiver stays silent, the STEREO leds stays down, nothing can be heard
then.

Obviously I've used a new FM dipole, no changes... Any clues/advices ?
Thank you all and hi from Italy.

Franco.

TFranco60 wrote:
Hi everybody,

I'm trying to fix a stereo tuner TEAC T-X120 I've received from a
friend of mine,
this tuner shows issues when in FM:

1. The automaic search of the FM radio stations seems not to work,
you can eventually
start it, the receivers seems to run thru the FM frequencies, but no
station found/tuned.

2. You can tune manually a radio station only in MONO, if you try to
switch to STEREO
the receiver stays silent, the STEREO leds stays down, nothing can be
heard then.

Obviously I've used a new FM dipole, no changes... Any clues/advices ?
Thank you all and hi from Italy.

Franco.

The discriminator adjustment is off. This is actually a very common problem
for digital tuners. There are two discriminator adjutments in a typical
tuner. One adjusts the station centering (I suppose you could call it a
"zero-cross" point), the other affects the distortion more. For this reason
this alignment should be done in a shop by a qualified tech. In rare cases
an out-of-spec 7.2 mHz crystal could cause the same symptom.

Mark Z.

Mark,

that was it... thanks to a friend of mine who helped me with his
oscilloscopen we could easily fix the issue and now the tuner is back to
life.
Thank you so much !

Franco.

The discriminator adjustment is off. This is actually a very common
problem for digital tuners. There are two discriminator adjutments in a
typical tuner. One adjusts the station centering (I suppose you could call
it a "zero-cross" point), the other affects the distortion more. For this
reason this alignment should be done in a shop by a qualified tech. In
rare cases an out-of-spec 7.2 mHz crystal could cause the same symptom.

Mark Z.