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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

What is the story with the Panasonic SA-PT760?



 
 
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  #1  
Old February 25th 11, 02:07 AM posted to sci.electronics.repair
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Posts: 36
Default What is the story with the Panasonic SA-PT760?

Is there a known problem with this unit? I have one and it is
completely dead, - as if there is a fuse dead on the power supply.

I checked with Panasonic and they wouldn't speak about it (or possibly
some Indian support centre couldn't speak about it?) They insisted on
my calling some local dealer who said the unit, which may well still
be under warranty, wasn't likely to have a fuse problem. So I did a
bit of research and amazingly came across someone on ebay offering to
repair this specific unit!! Not that this is unknown but why this
specific unit? I checked and usually these sorts of offers are
limited to things like Krells?? (or units which are presumably known
to go wrong, - and in a certain known area, - just after the
warranty has expired)

So I peeked inside, being careful not to disturb the screws. Guess
what? There IS a fuse inside it and it isn't blown.

Is this something to do with it boasting 125 watts (on numerous
channels), yet being light as a feather, as if there is hardly a power
transformer in it? Or more to do with the underside looking a bit
like a cheap throw away Sony VHS unit?

Does anyone know what is the problem with this unit please? There isnt
a repair station anywhere near me.

Ads
  #2  
Old February 25th 11, 02:53 AM posted to sci.electronics.repair
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Posts: 6,559
Default What is the story with the Panasonic SA-PT760?



"myfathersson" wrote in message
...
Is there a known problem with this unit? I have one and it is
completely dead, - as if there is a fuse dead on the power supply.

I checked with Panasonic and they wouldn't speak about it (or possibly
some Indian support centre couldn't speak about it?) They insisted on
my calling some local dealer who said the unit, which may well still
be under warranty, wasn't likely to have a fuse problem. So I did a
bit of research and amazingly came across someone on ebay offering to
repair this specific unit!! Not that this is unknown but why this
specific unit? I checked and usually these sorts of offers are
limited to things like Krells?? (or units which are presumably known
to go wrong, - and in a certain known area, - just after the
warranty has expired)

So I peeked inside, being careful not to disturb the screws. Guess
what? There IS a fuse inside it and it isn't blown.

Is this something to do with it boasting 125 watts (on numerous
channels), yet being light as a feather, as if there is hardly a power
transformer in it? Or more to do with the underside looking a bit
like a cheap throw away Sony VHS unit?

Does anyone know what is the problem with this unit please? There isnt
a repair station anywhere near me.


There probably isn't a power transformer in it. If it weighs next to
nothing, then it will be a switchmode power supply, as most of Pan's recent
stuff is. You would stand no chance whatsoever of fixing this unless you are
experienced with switchers. The chances are that the problem is actually
small, if the fuse is intact, but without specialised test equipment like an
ESR meter and a scope, and a lot of experience and understanding of the very
real dangers of switchers, then you are best to leave it to someone used to
working on them.

If there is not a Pan dealer, or anyone else with the relevant experience in
your area, then if the eBay guy has good feedback, perhaps you should
consider sending it back to him ?

Arfa

  #3  
Old February 25th 11, 03:06 PM posted to sci.electronics.repair
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Posts: 1,253
Default What is the story with the Panasonic SA-PT760?

On 2/24/2011 8:07 PM, myfathersson wrote:
...

So I peeked inside, being careful not to disturb the screws. Guess
what? There IS a fuse inside it and it isn't blown.


And HOW do you know it is not blown? By looking at it? I don't think so...

--
I'm never going to grow up.
  #4  
Old February 25th 11, 05:31 PM posted to sci.electronics.repair
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Posts: 6,559
Default What is the story with the Panasonic SA-PT760?



"PeterD" wrote in message
...
On 2/24/2011 8:07 PM, myfathersson wrote:
...

So I peeked inside, being careful not to disturb the screws. Guess
what? There IS a fuse inside it and it isn't blown.


And HOW do you know it is not blown? By looking at it? I don't think so...

--
I'm never going to grow up.


Unless it is a ceramic cased HRC type where you can't see the actual fuse
element - and admittedly this is sometimes the case with front-end fuses in
switchers - then if the fuse *looks* intact, it probably *is* intact. Fuses
in switchers tend not to fail 'softly' from metal fatigue or gentle overload
as they do in linear supplies. Most cases, if a fuse in the front end of a
switcher has failed, it will have done so spectacularly and will be at least
blackened, and sometimes even shattered. Hence the reason that ceramic cased
fuses in this position, are favoured by some manufacturers ...

Arfa

  #5  
Old February 26th 11, 05:34 AM posted to sci.electronics.repair
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Posts: 36
Default What is the story with the Panasonic SA-PT760?

"Most cases, if a fuse in the front end of a switcher has failed, it
will have done so spectacularly "

Thanks guys, that is what I figured. You are right, this isnt a job
for me!
  #6  
Old February 26th 11, 05:34 AM posted to sci.electronics.repair
external usenet poster
 
Posts: 36
Default What is the story with the Panasonic SA-PT760?

"Most cases, if a fuse in the front end of a switcher has failed, it
will have done so spectacularly "

Thanks guys, that is what I figured. You are right, this isnt a job
for me!
  #7  
Old February 26th 11, 05:36 AM posted to sci.electronics.repair
external usenet poster
 
Posts: 36
Default What is the story with the Panasonic SA-PT760?

"Most cases, if a fuse in the front end of a switcher has failed, it
will have done so spectacularly "

Thanks guys, that is what I figured. You are right, this isnt a job
for me!
 




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