b3groover wrote: scottrod wrote:
The fix for the glue is so easy it's not even funny. It just takes a little time depending on the severity of the problem.
What is the fix (or a link)?
I couldn't find anything definitive on the web, just a lot of half-baked suggestions...
I'm curious, too. I have the opportunity to get one for a good price, but I'm concerned about the glue issue. How does one fix it?
Actually it depends on the condition but it aint easy, thats for sure. This glue is the stickiest thing I have ever dealt with in my life.
You can use Caustic Soda (or NAOH, or Sodium hydroxide) + water solution to remove the glue from the keys without harming the plastic. It can harm human though , so take all necessary precautions.
Chances are that most of the key weights have not fallen off, so you will need a hair dryer in order to heat the glue and remove the remaining key weights easily using a screwdriver.
Dip the keys for a few hours in the solution and repeat the procedure until all glue is dissolved.
The solution is plastic friendly but it affects the"shininess" of the keys, making them look rather dull in color.
After this, the keys will have an awful smell so you will need to clean them properly. . The key weights can be attached back on the keys by using 4min epoxy glues.
Now here are the bad news : the glue might have fallen on the flexible strip pcb which is under the keyboard. thats the point where all h**l breaks loose.
Removing the glue from the pcb is near impossible, chances are that you will lift the sensitive carbon traces and destroy the pcb. Also , the flexible pcb strip assembly is actually 2 parts glued together. Be very gentle while handling the pcb because if they get apart it is a h**l of a work to put them back together.
Unfortunately roland does not have any keyboard pcbs left, so you have to buy the whole keyboard assembly.
If you are lucky to find a replacement pcb , just make sure that it is compatible with your keyboard , there was a second keyboard revision that had different wiring than the original one.
If there is any glue stuck on the metal frame you can use a spray freezer to freeze the glue and scrape it off.Acetone is also useful (not on plastic!) but very messy.
Roland recognized the production fault and gave a free keyboard replacement for most JDs in the US until a few years ago, maybe u should contact them and claim for a replacement.