Yamaha PSR-200 won't turn on

I purchased this Yamaha PSR-200 perhaps 25 years ago for my kids.  Now, my granddaughter wants to use it and I cannot find the adapter to plug it in.  Also, I have put in new batteries, but it will not work.  Is there any way I can get this to work.  Is there a repair service I can access?  Or is it just too old to work?  Should I throw this out and get a new one?