Let's Get Technical > Troubleshooting Problems

ADA MP-1 v1.36 Switches on! Normal background noise there, but no Output!!!!

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Pedro:
Greetings,

I am new in the ADA Depot.

I have just acquired a ADA MP-1 on Catawiki. Unfortunately it arrived not working.
The unit turns on and appears ok after the diagnostic. Its a firmware 1.36.
You can also hear a background noise in the distortion channels, which is not there in the clean channel.
No sound comes from the input (tried both front and rear).

Can anyone help me to pin point the problem?

Here is a video with the problem.
https://www.youtube.com/watch?v=Mt4MzFgl4AA

Thanks in advance for any help you can give me.

Cheers!

rnolan:
Hey Pedro, welcome to the depot.  Do you get any output from the Fx send or the headphone out?

Pedro:
Hi rnolan,

No output from the headphone out (besides that standby noise), FX I havent checked but i will check this afternoon.
Thanks!
Pedro

MarshallJMP:
Hey Pedro

From looking at your video it seems that the front jack has been replaced, can you take a few pics of the inside of the unit so I can have a look?
The unit seems to work so my first guess would be to check that input. BTW the rear input is line level in, not instrument and is normally switched on if nothing is plugged in in the front. But if they replaced the front jack it could be it doesn't work anymore. So first let's start out with some pics.

Pedro:
Thanks for your fast answer guys!!
Much appreciated.

First to rnolan, i did try the FX send output and again noise comes but no output. The noise level does increase if i turn the fx level up.

In Answer to MJMP, i did not notice any volume difference when changing from OD1 to OD2.
Here are a few photos from the inside in zip file attached.

I did notice when comparing with other photos for MP-1 insides, that the capacitors are not original (makes sense after all this time), no cable tie around them and it was not used axial capacitor but a radial one. A bit sloppy work maybe.
Also i i measured the battery which seems also not the original system (maybe battery mod?!?!) but measures above 3v so that seems good (also no error during start up).

Again thanks for your help.

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