XBase09 switch cleanup
Friend of mine donated me a defunct XBase09 describing its fault as “sequencer broken but sounds can be tweaked and triggered using MIDI”. Sure thing, I’m up for a analog kick / snaredrum sound module, especially after my 9090 project failed way too close to the finishing line.
So, I get the device in my hands and start looking for a fault. Power up, lights activate and the unit seems as if the CPU is perfectly fine. It’s just not responding to any keypresses.. sound triggering switches work fine though. I move on to check how the keyboard is wired up and also measure a particular switch for conductivity.. Bingo! Switches not making proper contact.
I then spent a good few days digging the net for replacement parts, only to find roughly about zero shops. Sure, the pin spacing is standard and there are tons of halfway-there replacements, but getting a illuminated version of the switch.. Oh crap, defaulting to switch cleanup then.
The switch has four tabs holding the actuator / LED top cover in place, these are the black circular ones visible in the following picture. They’re slightly melted from the top to clamp down the cover, thus prying needs to be done carefully as not to break the corners. I used a small pin, lifting gently from both sides little at a time.
Finally, off the cover comes! Looking at the contact plate and the base part, it’s no wonder the switch is not making contact :). Not that it was anything a q-tip soaked in isopropylene couldn’t clean..
Good thing is that despite the cover of the switch is not “factory sealed” anymore after this cleanup, it still holds in place pretty ok without melting the tabs again. Small dabs of cyanoacrylate glue could also be used to fasten the cover back in place: I assume that the next time a unit serviced in this manner needs switch repairs, they need to be replaced altogether..
If you happen to know a electronics shop in the net that delivers worldwide mail orders AND stocks these switches, I wouldn’t mind about being clued in on it.. And no, I’m not placing a factory order just to get a handful of these switches ;).