Trouble shoot Leader 9 Hz to 1 MHz Audio Signal Generator Model LAG-120A - diyAudio
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Old 24th January 2013, 05:33 AM   #1
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Default Trouble shoot Leader 9 Hz to 1 MHz Audio Signal Generator Model LAG-120A

Hi folks,

I picked up a Leader LAG-120A Signal Generator on ebay and it seems to be more or less kaput. When I hook it up to my scope, I get a noisy looking sine wave that doesn't change amplitude, frequency, or waveform upon pressing any button or turning any knob.

I've already reached out to the seller, but thought I would also see if anyone here has any thoughts on whether this is something that you've seen before that might have an easy fix or if this is indicative of a big problem.

I'm tempted to negotiate the price down to practically nothing and then take a crack at fixing it. (This is diyaudio after all.) But if chances are that it's totally kaput, I'd go for a complete refund.

Looking forward to your thoughts.

Thanks!
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Old 24th January 2013, 03:41 PM   #2
EssB is online now EssB  United Kingdom
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I've no experience of that unit but the schematic looks simple enough to fix up.
Manual in this thread Leader LAG-120B Teardown & Testing
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Old 24th January 2013, 03:45 PM   #3
EssB is online now EssB  United Kingdom
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.. that thread is for the 120B, here's the 120A schematic, doesn't look all that different
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File Type: jpg Leader LAG-120A Osc Schem.jpg (475.9 KB, 121 views)
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Old 24th January 2013, 04:43 PM   #4
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Thanks for the link. I'll see if I can get the guy to give it for me at "parts only" cost and then add this to my project list!
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Old 25th January 2013, 02:20 AM   #5
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Well, I opened it up and didn't see anything obviously wrong. No burned resistors or bulging caps. All looked as it should. Build quality seemed quite good actually. Any guidance on where to start for trouble shooting?
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Old 25th January 2013, 07:23 AM   #6
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by oneplustwo View Post
Any guidance on where to start for trouble shooting?
Power supply in general, then Elytics elsewhere.
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