“This is marked as Parts/Repair due to issues with some of the buttons not functioning properly. The actual keyboard keys are fully functional even the after touch feature (which can go on these). The patch buttons (that change between the various voices created) are all functional (sometimes can take more than one press), so you can get all the different sounds out of it but of the remaining buttons, maybe 1/3 are functional (the num pad included). The dial, the analog nub, and all the sliders on the left, are totally functional. Aside from these issues, the synth is fully functional and sounds absolutely gorgeous.
I haven’t even cracked it open to take a look, so maybe these are easily repaired, but I would expect to have to replace the switches to get it back up to 100% functional. ” Click here to visit listing on eBay
“Roland SUPER JX JX-10 polyphonic synthesizer working AS IS. Condition is “Used”. This is the roland jx 10 tested and working comes with power cable and rom cart. Reason why it is as is. Is because of the missing keys and condition of the unit it powers on sound comes out of the speakers but the menu diving for peramiters is not for me. So if this is the synth for you enjoy . and happy playing!!!” 
“Synth is in good working order. Everything works, but clearly some of the buttons could use a cleaning on their contacts as a few of them need a little extra push or wiggle on the button press (doesn’t effect functionality). Key contacts have been cleaned and work flawlessly.” 
” Roland JX-10 analog synthesizer.
“Good used shape, Powers on and Tested and working for the most part. some keys are not working like the contacts need cleaning. some of the functions buttons on the panel are stuck and will need to be cleaned and serviced. bender working. not fully tested so will have to sell AS-IS, no returns. Please see all pictures for condition. has scratches and wear as seen. display reads well. 2 prong power cable is NOT included. ”
“Roland JX-10 Polyphonic Analog Synthesizer. Condition is Used. Local pickup only.
“***** ROLAND SUPER-JX JX-10 VINTAGE ANALOG POLYSYNTH WITH PG-800*****
“This JX-10 is in good condition for it’s age. The display coil needs to be replaced (available on eBay), and this causes one character to have all segments fully lit and another character to be missing (see pics). The lowest key has apparently been replaced by the previous owner so it is whiter than the others. Other than that, the unit is fully functional and looks pretty good.” 
“Wow! Roland Super JX-10.
“ROLAND JX-10 SUPER JX Synthesizer. Condition is Used. This keyboard has only been uaed in my studio.” 
“BHeres a roland JX-10 synth. It is clean and in good condition. Works great. No dead keys or sticky keys. This is for local pick up in santa barbara plus CA sales tax”
“This is a vintage Roland Super JX or JX-10 Synthesizer! Obviously there are a couple keys with issues, but the last time I played this (a few years ago), It sounded beautiful!!! THIS AUCTION IS SOLD AS IS, NO RETURNS!!!!(If you have a better keyboard, you could always MIDI to it). See is an old beauty and with some TLC, you will really enjoy the sounds!”
“Amazing Condition. Everything works. In Roland Box (not original)”