keys on Roland

  • Thread starter Thread starter tedmuse
  • Start date Start date
T

tedmuse

New member
I've got an 88key Roland HP 800 with two silent keys (work mechanically but no longer produce any sound). Middle C and F above middle C.

I've got the lid up and the keyboard exposed and would like to get under those keys.

Does anyone know if those keys come up one at a time or if the entire set is somehow released and lifts, and how is it done?

Or, has something happened to the board or something like that? (I'm a tech newbie)

I suspect I have a contact problem, as I used to erase above those keys. Maybe I just need solder or something. If so , i've got to get under there.

Any help is greatly appreciated!.

Ted
 
You have to pop the keys out with a screwdriver. They may seem like they don't wanna come out. Just pry real hard.
 
I got all the contacts replaced in my ms2000 after having a little "whoopsie" with a beer, and it was less than $90.
 
Well... DON'T pop them out. :D Good one though.

I have done a repair like this on a Roland keyboard. I wasn't a 88key weighted keyboard though. Just regular synth keyboard, which is probably alot simpler mechanically...

Here's what I did (btw, I'm an electronics engineer with some experience in opening up things, and getting them back together afterwards. I'm rather experienced with a soldering iron to in case anything goes wrong, and I actually have an idea what I'm doing too...): just unscrew the bottom, opened it up. Look at what needs to be removed to get to the keys. Look what connectors and cable have to be loosened to get there. What pcbs have to be removed? If there's alot of cables, be carefull, you don't wanna get them messed up. Alot of those cables will only fit one connector, or be of the flex type, which show themselves where they have to go (the placement of flextype connectors is pretty clear...). If you think you might mix them up, mark the cables before unplugging them. You might get into alot of trouble and it might take a while before you get back to plugging it all in.

Then, when you get to the keyboard. For the roland I was working in, it had 2 switches for each key. This is for velocity sensitivity. You push the key and both of those switches will go down shortly after eachother, the time in between allows the keyboard to know how fast you pushed the key.

So, those switches, in the keyboard I was working on, consisted of a rubber enclosure with a conducting surface (I think) that was pushed on the pcb, connecting 2 pads on the pcb. So what I did was just take a cotton swab and cleaned those contacts... Reassembled the thing. And it worked. Now where's my cash?
 
subtractor said:
I got all the contacts replaced in my ms2000 after having a little "whoopsie" with a beer, and it was less than $90.
Click to expand...

It's my guess that they didn't really replace them, just cleaned the pcb. But some of those guys just use big words like that. The contacts are probably on a pcb (if not the main pcb), changing that would've costed more I guess...

Beer is bad, since when dried up it still conducts. Coke is better, sticky stuff, but it doesn't conduct when dried up... Or that's what they told me... :cool:
 
Thnaks for your replies.

I'm a little tech shy-took me a long time to work up the nerve to unscrew and open the lid! I did that and vacuumed around and,as far as I could , underneath the set of keys. It didn't help.


I'll see if I can get an electronics buddy to come over and work from Roel's guidelines-unless he visits NYC, then I'll give him the contract!

Failing that, I'll probably sell the unit. Too bad, has great electrcic piano sound.

Thanks again....................Ted
 
You might go to an electronics store and get some of that spray stuff for cleaning contacts. I've used it to clean the slider contacts on my jupiter4 and it works pretty well. You may be able to spray under the keys.
 
You must log in or register to reply here.
Back
Top