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Lab Gruppen - Lab 2000 - psu fault |
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Geigertron 
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Joined: 20 February 2006 Location: United Kingdom Status: Offline Points: 204 |
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 Topic: Lab Gruppen - Lab 2000 - psu faultPosted: 07 September 2018 at 5:57pm |
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I have a lab 2000 that is not powering up, the IC (U1) in the psu board is a 20 pin, yet in the manual parts list it shows as part TDA4718A which is not 20 pin (16 pin), so should it be a TDA4918a ? I can't tell as I can't read the marking. Hope someone can help, I realise this is a old amp, but I'd really like to get it working again. |
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kedwardsleisure
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4946 |
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Posted: 08 September 2018 at 12:16am |
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what psu board do you have?
If you speak to Lab they will tell you the correct part |
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Kevin
North Staffordshire |
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Geigertron
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Posted: 08 September 2018 at 9:41am |
It's shows as lab 2k psu B. I tried to make contact on their web page, but didn't have much luck, they want a proof of purchase photo, which I don't have as I bought it from eBay. |
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kedwardsleisure
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4946 |
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Posted: 12 September 2018 at 2:45pm |
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that's quite an oldie I'd guess. The diagram here is rev G onwards
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Kevin
North Staffordshire |
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simonp1100
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Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Posted: 12 September 2018 at 9:53pm |
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Looking at my service manual, the early model was using a TDA4700 & this is a 24 pin device and then the TDA4718A was later used and is a 18 pin device. I have found out through the internet that they also used UC3851, but again this is a 18 pin device.
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doctor
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Joined: 15 November 2011 Status: Offline Points: 7 |
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Posted: 19 September 2018 at 1:20pm |
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I think you're dealing with a
Chinese clone. For many models of LAB GRUPPEN there are Chinese clones, which also
differ from each other. Schemes and components often also differ.
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Geigertron
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Posted: 20 September 2018 at 5:43pm |
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hi guys,
Thanks for the help, I think I'm going to locate my isolation transformer & take a look on the scope
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kedwardsleisure
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4946 |
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Posted: 20 September 2018 at 5:54pm |
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good luck, they're a quality item after all
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Kevin
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kedwardsleisure wrote: