I seem to have killed the control surface on my mb-6582.
I think this is the result of one or both of these very stupid mistakes.
I connected the LCD cable 15-way plug upside-down. The display survived this time, to my surprise.
I had the display fitted in the CS board (though not actually screwed in), without putting any insulator over the contacts on the front of the LCD board, so I may have shorted something out here too.
Now, the display works, encoders work, but some of the buttons no longer seem to work, and some LEDs don’t light.
I’m assuming I’ve burnt out one or more components on the mainboard, but I don’t have any idea where to start tracking down what. Is it likely to be the 74HC595Ns or the transistors between mainboard and cs? How would I check?
It was the connectors again- should have checked before I posted.
Those Mauser 8-way connectors are really delicate. Just had to desolder all of them aften I noticed lots of the wires had broken
I don’t know what to do now. I’ve tried two different kinds of multiway connector, and both broke before I’d managed to get the two boards properly into the PT-10.
I was really hoping to have got this project finished, and with sparx’s amazingly generous help, I was nearly there. This connector issue is really bugging me though- I seem to be taking steps backwards every time I sit down to work on this. Every time I have to desolder I end up damaging more pads, too…
i would change all the 74HC on the mainboard if the trooblshoot continues. some might have burned, which explain why some led/button of the “scan matrix” (not the matrix to create sounds) don’t work
forget the connector, use direct wires from pad to pad
Ah, I see. I guess you used 8-way versions, though. Can you get ribbon-cable and ‘clamp-on’ connectors for this format, too (I mean like the ones used for the LCD cable), I wonder.
The latter ones are angled 90°, and should provide enough comfort for cabling
There are also connectors with less pin count available, suitable for MIDI socket connection, power supply etc.
If you do not reside in .de, I’m quite sure you can get similar or the same stuff in other countries as well.
Sorry to fire loads of questions at you but did you solder the wires directly to the board at the other end, or just buy the same assemblies for each end, and connect the two wires together (or crimp the free ends and stick them into the other sockets)?
I soldered them directly to the board, since 30cm is really enough to open it and leave it connected
Ah, I see. You didn’t find you were having problems with the wires getting stressed where they were soldered into the board then? Which board did you solder the connectors, the CS board of the mainboard?
I had the same problem so i decided to order those cables from Conrad also.
Ill have to cut one of them into a 2-pin version.
The ribbon cables that didnt break, were very easy to pull off by hand.
I experienced this problem too. I could be wrong but my thoughts were that the stranded wire might not be as idiot-proof as solid copper “hook up” wires in the sense that solid core might tolerate metal fatigue better. Hence, beginners might have a bit more luck with solid core, although you would have to cut and strip each one individually and identically. I did not check that solid core would fit in the holes - that would be another consideration. Knock on major wood that I don’t have to repair this again. I had to pick out little strands while desoldering, I lifted two pads, etc.
