The physical act of opening and using tools is simple. 6 screws on the face panel release from the chassis.
Bottom PCB is screwed to the classis and has the input/output jacks etc and also has the processor so all the brains. Top PCB has the buttons, the pots, the screen etc.
Two ribbon cables connect them. Molex end terminals which are easy to release with your fingers, no crazy clip in design terminals. Very straightforward for this part.
The back has something like 9 or 11 screws, different hex size than the face panel, slightly larger.
You open the box. Lift the top carefully. Release the ribbon cables. Now the top is free.
You pull off the knob caps, set them aside. Flip over the panel onto a soft surface and undo all rear screws which hold the UI PCB to the face panel. Face panel has cylindrical turrets behind it which project out and which are threaded for the PCB screws to insert from the rear.
You take the new panel and line up the holes with the PCB and soft insert the screws, only to finger tightness.
Now is the only part which is delicate:
The PCB with the buttons must be lined up very carefully so trigs and other buttons do not rub on the edge of the cutouts for buttons.
The way I do this is to tighten the screws enough for a little bit of movement between the PCB and the face panel, not not enough to move on it’s own, only if I’m pushing on it.
I look at the top where you can see the screen, and hold it in my hands like you’re carrying your dinner plate to the table to eat. I push on the buttons to see if they rub and if one does, I make a small adjustment by using my hands and fingers to push the PCB from the side and using the other hand to make sure it doesn’t go too far, only as far as I choose.
The first time feels a bit awkward but I’ve done this to reposition the PCB against buttons rubbing several times and now it seems fairly simple, so I think it’s only the fear of making an error which makes us timid. The process is however very safe and the technical difficulty is very low, it just requires some patience and an understanding of the mechanics which make the faceplate align with the buttons (X/Y axial movement creates or lessens the gaps around buttons and all have to be aligned for good clearance).
Finally, if all buttons push without rubbing, then finish tightening the rear the additional 10% with the wrench. Plug in the ribbon connectors. Place the face panel on the chassis and align the holes. Insert 6 screws and finished.
I can show you a picture sometime if that will help, so let me know if you ever need that.