ilfungo

Amek m2500 weird noise
« on: December 05, 2019, 08:41:08 AM »
Hi
Last day my console start with this weird noise.
I've changed the broken bridge rectifier on -17.5 and the noise is solved but:
Randomly I have the same noise and with oscilloscope I've seen that when there is noise
 on the -17.5v output the ripple go up.
The problem go away with meter disconnected ( led meter).
With meters connette the noise is random...
The psu and console are totaly recapped.
All the meters and console are working fine...
Suggestions?
Thanks!


ilfungo

Re: Amek m2500 weird noise
« Reply #1 on: December 05, 2019, 08:42:14 AM »
Could be' a weird regulator Lm338k or the booster transistor mj2955?
Thanks!

mjrippe

Re: Amek m2500 weird noise
« Reply #2 on: December 06, 2019, 10:26:16 PM »
Sounds like something is dying in the meters, likely a cap.

ilfungo

Re: Amek m2500 weird noise
« Reply #3 on: December 09, 2019, 01:40:20 PM »
Thanks for suggestions....
I've discovered that the problem come randomly form main AC .
I think could be a near Motor...
Thanks!!!


 

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