Hello everyone, I'm hoping you guys can help me. Here's the issue:
I have an old Yamaha FM synth, the Portasound PSS-480. Some of the function buttons do not work when pressed externally. This essentially disables any possibility of sound tweaking, so rendering it pretty much useless for me.
Now, that said, I have opened it up (man it was dirty in there lol). It has been cleaned with rubbing alcohol. I reassembled it, but the buttons still do not work. So I took it apart again, and this time plugged it in. The buttons that do not work when pressed externally when the synth is assembled, DO work when I press them with my bare fingers directly on the circuitboard. ALSO, the disabled buttons work when pressed with the rubber from working buttons from elsewhere on the synth.
My suspicion is that the rubber for the non-working buttons is worn out. Is this correct? Is there anything I can do?
Here are some pictures of what it looks like:
Here are the buttons:
in this below picture, I think the black tabs in the middle of the button is worn.
Below, the buttons work when I press them directly with my finger or thumb. The first and second buttons from the left are - and + for the currently selected parameter.
I'm not very familiar with the insides of electronics, but I'm capable, so any help would be greatly appreciated!
Is there anything I can do as a DIY solution?
BTW, I'm aware that this is not the sluttiest synth out there lol, but it's got a single operator FM engine in it. It's not half bad. With some proper tweaking and running it through some effects will make it sound quite good I think. It was my first ever synth when I was about 7 or so, so it's got great sentimental value for me yada yada, and now that I 'know what I'm doing' when it comes to music, I think it would be an awesome addition to my current setup.
Thank you for any help at all!
ps, I have tried to seach, but I can't find anything. I don't think I have the terminology right.