MP-1 does not change Presets correctly

[MarshallJMP]

Mmmm maybe the UART or one of the supporting chips.Has anything been replaced on the midi board?

[Griphook]

With Midi Board you mean the "extra" PCB with the MIDI/In/Out jacks on it?

I made so0me more fotos.
Where do I find the UART and the supporting chips? So I can give you a closer look.

There seems to be some real soldering garbage going on

[Griphook]

And the other side


I really can't tell if anything is replaced except the pretty obvious Front Panel. I bought it as seen. The ebay-seller told me it would work all fine. Since I played my mates MP1 I thought there was no need for traveling through half germany and then buyed it for ca. 150€ 

[rnolan]

Hey Griphook, I don't see a display on the replacement front panel, how do you see patch numbers and parameter values ?

[Griphook]

The Display is Stock. It is just Not in the Picture.

[rnolan]

Ahh no worries, I get it now.  If the MP1 is responding to CC messages (and it shouldn't), what else has been changed 

[Griphook]

I cant tell you what else has been changed. The PreOwner just forwarded me to this forum  ;D
He also stated that the wirebridges could be a consequence of the MP1-Update-Improvements (http://www.marshalljmpmodshop.net/mp-1%20update.pdf), but I dont know if anything of this concerns the two ICs?

[rnolan]

Well you've come to the right place IMO  :wave: and great to have you here BTW  Any luck doing the mapping in the GMaj ? Just to get you going, as we (well mostly you and MJMP) try to get to the bottom of what's going on.

[Griphook]

I'm glad to be here!  :whoohoo!: Its very nice to have a forum with people chatting about so "old" Gear. Totally love it!

Well, no, not really. ATM I'm going with the ADA listening on ALL Channels and getting the last ProgramChange. This seems to work(but it is still a workaround).  In addition Imo the MIDI-Mapping is still a bit confusing If I understand it right, I am able to map every ProgramChange to every Internal MP1 Memory but still send the same ProgramCahnge to the Gmaj2. If this is it, it is not what i need. My needs are the following presets:
ADA 100 & GMaj 34, ADA 101 & GMaj 34, ADA 101 & GMaj 35. Yet I dont think the mapping will work in this case? But for this I would need a new Thread to not mess things up with the MIDI-Problem?

[MarshallJMP]

Well this is a G rev board so no updates required.I see they changed a lot of stuff on both the main and midi board.The bridge wires are there because they stripped a lot of traces and pads during the change of all those IC's.
The big question is,is this the cause of the strange midi behaviour or not.

R,maybe you could ask Mike to try this out with his rig and see if it works for him or not.This way we know if it is possible or not?

[Griphook]

So its very difficult to find this particular error. I really have no clue why all this changes were made. What are these ICs for?

[MarshallJMP]

From what i can see all digital stuff,gates,flip flops,decoders etc...

[Griphook]

Oh my..
So I managed to get my Multimeter back. Any Points where I should Start measuring?

[Griphook]

Ok i see now,don't think that is problem,but you can alsways measure it out from pin to pin with an ohm meter.

Checked it and connection is good. Anything else I can check?

[MarshallJMP]

Mmm not with a multimeter,do you have a scoope?