XBS has been making an effort to do more tech related stuff this month. In for repair today is a Roland TR-909 in messed up shape. Someone had tried to refurbish it and made most of it's age and design related problems worse!
1, The main drum switches were replaced which is nice but they were installed sloppily and so out of true that the buttons don't fit in properly. On further investigation the problem was often the fact that too much silicone was used to glue in the drum switch LED's so that the switch didn't fit flush to the switch board PCB.
2, The ribbon cables were re-soldered and rendered non functional because the ribbon cable ends were not trimmed evenly prior to soldering ( anyone familiar with multiconductor cable work knows that the trimmed end lengths of all parts must be exactly correct or else they break off immediately due to imbalanced strain distribution ).
3, One of the new drum switches was actually bad so it was replaced with one of the original ones that was removed.
On another note, the previous owner did manage to get the Roland TR-909 OS v4.0 chip in and it works which is a huge relief as that would be hard for me to troubleshoot. Also, the pots and small switches were done well when they were replaced and all seem to be working. =D