I have a roland tr-707 with broken sequencer and midi.
Sounds are triggered by buttons, but not by the sequencer.
It’s possible to connect mb808 with roland tr-707 but not per midi??
I have a roland tr-707 with broken sequencer and midi.
Sounds are triggered by buttons, but not by the sequencer.
It’s possible to connect mb808 with roland tr-707 but not per midi??
Is the DIN Sync still functional?
I don’t know.
did you try to reinitialize it? (HOLD TRACK WRITE AND PATTERN A AND POWER ON)
If reinitialisation is impossible, you can check Ram soldering (IC14 et IC15)if you don’ t see any problem, resolder them
I had the same problem and after resolder ram and reinitialize, it works now.
good luck!
Thans, i will check it. 
I have a roland tr-707 with broken sequencer and midi.
Sounds are triggered by buttons, but not by the sequencer.
It’s possible to connect mb808 with roland tr-707 but not per midi??
So, did you put it in step mode? ie, take it out of song mode.
(It’s song & patterns will be full of garbage with no batteries installed, or if they are flat / been missing etc)
The amount of times i’ve bought 707’s & 727’s that people said were not working, but it was just in the wrong mode? about 4 times.