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Successful Valhalla Repair

Successful Valhalla Repair

Postby DaveyW » Mon Apr 14, 2014 9:18 pm

Went to spin something tasty tonight that warranted a run out with the Sondek

Popped the disc on the platter and pushed the start button - NOTHING :evil:

No spinning, no light - NOUT! - Oh! No :o

Checked the fuse - all good there.

So surgery time - I feared the worst :mad:

No stylus guard on the OC9 so, knowing my luck, I removed it as a precaution

Underneath with the cover removed the main components (caps etc.) looked in good shape

Image

But a pair of resistors looked as though they'd been getting a little hot and bothered

One in particular measured out OK on the meter, but felt a little loose on the board

Image

Sure enough in removal of the board that very resistor had a loose joint

Surely this fix can't be this simple - Can it?

I re-wetted both joints on both suspect resistors, checked all round the board for any more dry joints, but all looked good.

So back into place it went, connections made and ..................

BINGO :Banana

Light came on and motor spun :cool:

Am I a Lucky Boy or What? :grin:


Rather than re-fit the OC9, I've taken this little diversion to fit my old fav. the Denon DL-S1 which I'm now listening to as I type.

Yep! This cart still does it for me :bubble :cans

What an eventful evening - All worked out great though!

Think I'll cap it off with a :whisky
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Re: Successful Valhalla Repair

Postby Pumpkinman » Mon Apr 14, 2014 11:00 pm

Might it not be a good idea to replace those 2 resistors ??
Here By The Sea And Sand Nothing Ever Goes As Planned.............P-man
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Re: Successful Valhalla Repair

Postby DaveyW » Tue Apr 15, 2014 3:52 pm

Pumpkinman wrote:Might it not be a good idea to replace those 2 resistors ??


Agreed! :thumb

Need to do a bit of research on these to make sure I get the right power rating/spec
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Re: Successful Valhalla Repair

Postby DaveyW » Tue Apr 15, 2014 5:12 pm

Done a quick bit of Googling

The Linn Valhalla trouble shooting guide states that these two resistors (R2 & R3) run hot.
I suspect that after 29 years this is just a bit of heat aging of the joint - It has seen a lot of use :grin:
Certainly the markings on the circuit board look like long term discolouration.

The recent move of the deck probably had a part to play in cracking the heat aged joint.

They measure up fine resistance wise - I think all is OK

Fingers crossed - Time will tell
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Re: Successful Valhalla Repair

Postby DaveyW » Tue Apr 15, 2014 5:22 pm

Hmmm! Just read the guide again

Looks like these resistors manage the mains conversion and are permanently seeing juice and getting hot whether the deck is in use or not.

Not good as I've always left it permanently plugged in :roll:

Will now be switching off at the socket when not in use :idea:

Live and learn eh? :wink:
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Re: Successful Valhalla Repair

Postby marcmorin » Wed Apr 16, 2014 4:32 pm

Dang, all that stuff. :jawdrop My power supply says 0.1uf 630vac :grin:
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Re: Successful Valhalla Repair

Postby DaveyW » Wed Apr 16, 2014 6:39 pm

marcmorin wrote:Dang, all that stuff. :jawdrop My power supply says 0.1uf 630vac :grin:


:lol:

All I know is I ain't no electrician and to get this back up and running so easily is a real result :bubble
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