Technics KN7000 :: Technics KN 2000 transformer dead

Viewing 1 to 2 (2 Total) Technics KN 2000 transformer dead
mangalvar Total Posts: 2 Joined: July 3, 2018	Last month I had a "gig" with my Technics KN 2000 and they had some bad electricity there in that club (supposedly put a higher voltage to the circuit we used). My Technics is dead since then. I have found out - with a help of my friend - that its transformer is dead. We might try to make the transformer. Do you by any chance have a service sheet (schematics) for this instrument in pdf? (or do you have any idea of what to do...?) Tags: Posted on July 4, 2018 at 3:12 AM
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davetutt United Kingdom Total Posts: 166 Joined: January 12, 2015	Re: Technics KN 2000 transformer dead The 2000 has an internal transformer and that in turn is protected by a pair of fuses on the connector board where the mains comes in. Transformers don't really fail without looking like they have been fried unless the internal thermal fuse has blown which if it doesn't look like its got hot won't have failed either. Have you actually done a resistance check across the transformer windings? These are low current power supplies and the load is minimal. The transformer has approximately 10 volt secondary windings. You might get away with a 9-0-9 but since I don't have one here I can't be sure. The power lines then after rectification would be around 12.6v dc which would fall within the voltage limits of the smoothing capacitors at around 16 volts. I suggest you check the transformer windings, the filter components on the mains connector panel, the connector itself and all the soldering. Once you have got to this point if the transformer outputs AC at around 10v then the fault is downstream at the rectifier and power circuitry most of which is no more than a few volts. Dave Posted on July 19, 2018 at 4:42 PM

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Technics KN 2000 transformer dead

mangalvar

Total Posts: 2

Joined: July 3, 2018

Last month I had a "gig" with my Technics KN 2000 and they had some bad electricity there in that club (supposedly put a higher voltage to the circuit we used). My Technics is dead since then. I have found out - with a help of my friend - that its transformer is dead.

We might try to make the transformer. Do you by any chance have a service sheet (schematics) for this instrument in pdf? (or do you have any idea of what to do...?)

Tags:

Posted on July 4, 2018 at 3:12 AM

1 Reply

davetutt

United Kingdom

Total Posts: 166

Joined: January 12, 2015

Re: Technics KN 2000 transformer dead

The 2000 has an internal transformer and that in turn is protected by a pair of fuses on the connector board where the mains comes in. Transformers don't really fail without looking like they have been fried unless the internal thermal fuse has blown which if it doesn't look like its got hot won't have failed either. Have you actually done a resistance check across the transformer windings? These are low current power supplies and the load is minimal.
The transformer has approximately 10 volt secondary windings. You might get away with a 9-0-9 but since I don't have one here I can't be sure. The power lines then after rectification would be around 12.6v dc which would fall within the voltage limits of the smoothing capacitors at around 16 volts.

I suggest you check the transformer windings, the filter components on the mains connector panel, the connector itself and all the soldering. Once you have got to this point if the transformer outputs AC at around 10v then the fault is downstream at the rectifier and power circuitry most of which is no more than a few volts.

Dave

Posted on July 19, 2018 at 4:42 PM

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Technics KN 2000 transformer dead

mangalvar

davetutt

Re: Technics KN 2000 transformer dead

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