diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Equipment & Tools (http://www.diyaudio.com/forums/equipment-tools/)
-   -   Trouble shoot Leader 9 Hz to 1 MHz Audio Signal Generator Model LAG-120A (http://www.diyaudio.com/forums/equipment-tools/228525-trouble-shoot-leader-9-hz-1-mhz-audio-signal-generator-model-lag-120a.html)

oneplustwo 24th January 2013 05:33 AM

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!

EssB 24th January 2013 03:41 PM

I've no experience of that unit but the schematic looks simple enough to fix up.
Manual in this thread http://www.diyaudio.com/forums/equip...n-testing.html

EssB 24th January 2013 03:45 PM

1 Attachment(s)
.. that thread is for the 120B, here's the 120A schematic, doesn't look all that different

oneplustwo 24th January 2013 04:43 PM

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!

oneplustwo 25th January 2013 02:20 AM

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?

Elvee 25th January 2013 07:23 AM

Quote:

Originally Posted by oneplustwo (Post 3341110)
Any guidance on where to start for trouble shooting?

Power supply in general, then Elytics elsewhere.


All times are GMT. The time now is 09:12 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2