Author Topic: Help needed Leader LBO-508A Oscilloscope power transformer smoking  (Read 276 times)

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Offline tonybob56

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  • Country: au
Can someone tell me where I can get a replacement transformer for my LBO-580A  as soon as I supply power the transformer starts to smoke and crackle.
I was given it from a friend and it may have other problems as some genius had put a 10amp 250 v fuse into it.(should have been 0.25amp 240 v)
I was thinking that I may have to use a couple of transformers and would like to know if anyone has any ideas .I am in Australia and the cro was set for 240v but I have set my work bench to run 110v or 240v as needed.

 

Offline Smoky

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Re: Help needed Leader LBO-508A Oscilloscope power transformer smoking
« Reply #1 on: December 16, 2019, 02:10:30 am »
Welcome to the club!

Odds are you will probably have to scrounge for a transformer from another oscilloscope.

I'm working on a LBO-302 oscilloscope and the transformer in mine does not match the transformer in the schematics.

If you do find a parts machine, check or make sure that you ask the seller what the Secondary winding output voltages are written on the label to ensure that you're getting the correct one.

I'm guessing that the higher-rated fuse, allowed the fault within the scope, bring the transformer to an early demise. Which is probably obvious.

Good luck with your project!


« Last Edit: December 16, 2019, 04:23:31 am by Smoky »
 

Offline andy3055

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Re: Help needed Leader LBO-508A Oscilloscope power transformer smoking
« Reply #2 on: December 16, 2019, 03:11:40 am »
Here is a link to the service manual: https://www.opweb.de/english/company/Leader/LBO-508

If the mains transformer is smoking, That is a sign of some serious short in the primary supply rails. You should be able to find the culprit fairly easily by just using your multi meter. There must be a leaking capacitor most likely. However, depending on the extent of the damage in the transformer, you may still need to replace it. Even if you find a working transformer, don't replace and switch it on until you are certain you have identified and replaced what is causing the short.

If you find anything on eBay or a similar site, that might be your option as it is an old scope.

Good luck.
 


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