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From: T i m on 14 Oct 2009 05:00
On Tue, 13 Oct 2009 20:22:47 -0400, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote:


>If memory serves, didn't those units have AUX IN and OUT in the back
>where you had to place jumper cables in ?
> other wise, you didn't get
>any sound.. Maybe a little leakage but that was it..

Erm, I think it has a tape loop but that's about it? I'm pretty sure
it *was* working ok and now it isn't and I've not touched it round the
back for *years*.


> ALso, maybe you're using an EQ that isn't working?

Nope, this is an all_in_one receiver. I've since found the owners
handbook on the net:

http://www.etronics.co.kr/english/download/pdf/R-125%28a%29.pdf

I read the service manual through yesterday and I think I have a
slightly better understanding of how the mute thing works for each of
the in / output and now don't think that's the problem. I turned the
volume right up when it was on FM and could tune it in to many
stations [1] (that you could just hear in the background). Then when
you selected say the 'Phono' input the set went quiet (suggesting the
FM was being 'muted' when de-selected and therefore (probably)
un-muted when selected).

The faultfinding suggests a transistor or a couple of ICs just after
front end could be at fault so I might go in there for a look
sometime.

Alternatively I could look for a compact DAB tuner and plug that into
the AUX as that seems to be the way we are going these days (even here
in the UK).

Cheers, T i m
From: T i m on 14 Oct 2009 05:12
On Wed, 14 Oct 2009 10:00:00 +0100, T i m <news(a)spaced.me.uk> wrote:

Ooops, bad form (again) I know ..

> I turned the
>volume right up when it was on FM and could tune it in to many
>stations [1]

[1] I note the stereo indicator never comes on, even when it sounds
like it's tuned into a local station that I know is stereo. Would that
confirm my thoughts that it's a component after the front end, before
the stereo decoding happens?

Cheers, T i m
From: Mark Zacharias on 14 Oct 2009 06:46
"T i m" <news(a)spaced.me.uk> wrote in message
news:g549d554om3aarogeokm7meeanfa46lhsj(a)4ax.com...
> Hi All,
>
> I have a fairly old but lightly used Sherwood R 125 RDS ss FM receiver
> but note the FM tuner has died.
>
> Well, it's working in as much it appears to auto tune and lock onto a
> station and with the volume turned up you can hear it trying to work
> but it's if it's heavily muted (and distorted). FWIW the AM side seems
> 'alive' but I have no aerial on there atm to really test it.
>
> I *think* I had something similar years ago on an old Memorex FM tuner
> and I think that was the cct that muted the signal between stations
> muting all the time?
>
> Anyone seen this before and any ideas re a fix please (as it's quite a
> nice unit otherwise).
>
> Cheers, T i m



Digital tuners often exhibit a problem where the discriminator alignment
drifts enough that problems similar to yours occur.

Really needs to go to a shop. It's a simple alignment, but not for a DIY
with no service manual or training.

Mark Z.

From: William Sommerwerck on 14 Oct 2009 06:53
> [1] I note the stereo indicator never comes on, even when it sounds
> like it's tuned into a local station that I know is stereo. Would that
> confirm my thoughts that it's a component after the front end, before
> the stereo decoding happens?

The indicator light might be burned out. Or, as someone else is pointed out,
the tuner might be slightly out of alignment.


From: T i m on 14 Oct 2009 07:56
On Wed, 14 Oct 2009 05:46:17 -0500, "Mark Zacharias"
<mark_zacharias(a)sbclobal.net> wrote:

>
>Digital tuners often exhibit a problem where the discriminator alignment
>drifts enough that problems similar to yours occur.

Ah, ok.
>
>Really needs to go to a shop. It's a simple alignment, but not for a DIY
>with no service manual or training.

I think I now have the service manual so potentially some test /
alignment procedures to follow. I have a scope, DMMs and frequency
counter etc but no signal injection kit but could probably rig
something if need be.

I would be happy to take such a thing to 'a shop' 1) I don't think we
have many over here (UK) any more and 2) if we did I think the work
would probably out-value the equipment?

I have been an electronics service engineer for much of my life it was
mainly on data-transmission / communications kit. I even got my Radio
Amateur ticked to do Packet radio. ;-)

I've had a look about and a DAB / FM tuner can be had for about �60
new so I could use that instead of the tuner part (I'm not too
bothered about 'quality' as long as it sounds ok and works).

Cheers, T i m (G7ICW)

p.s. I might see if I can find a local 'radio enthusiast' who might be
interested in having a look for a beer.
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