“This listing is for a Yamaha DX7 II-FD with E! Grey Matter Installed. All of the micro switches have been replaced along with the addition of an internal battery holder for easy replacement. The floppy drive works nicely as well as all buttons, volume & mod sliders. There are a couple banks loaded with various sounds but to get the most out of this awesome synth, you can upload additional sounds through a MIDI port interface. There are scratches, blemishes, scuffs, etc as it is over 30 years old.”
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“Looking for a new loving home for my DX7 II-FD Synthesizer, which is in good condition. Plays and sounds great. Includes a ROM cartridge with some great sounds. Owner’s manual. No case.”
“This board was well taken care of, it sounds great with no major wear.”
“Item is in fair/good cosmetic shape and has normal wear from use and storage. The 2 slider switches are in great working order but are missing the caps for easy use. All keys work and have the spring action. The keys feel weighted much like a piano so it plays like one. This is a very high end machine and was top of the line when it was released. The cartridges included are #3 and #4 and a protect able write rewrite cartridge for your own sounds.”
“For sale very nice YAMAHA DX7 digital programmable algorithm synthesizer and Unitec case. This unit is in very good condition and functions as intended. With Heavy Duty UNITEC case. This is a heavy unit and shipping will reflect it.”
“Yamaha DX7
“Yamaha DX7 – SuperMax’d – Good Shape, Very Clean.
” For sale is my Yamaha DX7 Digital Programmable Algorithm Synthesizer 61-Key Keyboard. Condition — For parts or not working. However, it does power on and might be easily repairable.
“I’m listing this item for parts or repair due to the fact I do not have the means to test it. It does power up though.Some of the center keys are not in its original placement but they still seem to be functional. Please see all pictures this is an as is item. Thanks for looking.”
“Firstly, I believe there is an E card in this unit , but I am not certain…..The unit powers on but there is no sound…I think it has to be reprogrammed to get the internal sounds….At least that is what the owner is telling me…I keyboard player would know better what that means….I don’t know if it’s a small fix…the right buyer should take advantage….This is why I am listing this as broken and for parts….”
“Yamaha DX7 FD2….The unit powers on and works fine…There are no issues…The power cord to the unit was professionally shortened to make it fit better….You can always attach an extension cord to it”
“Yamaha DX7 Used. Works fine is a little bit dusty and dirty hasn’t been used in a while. has normal wear marks and scratches. Number 8 is scratched off the cord is coming out a little bit. No cartridge. comes with a forge II case by Anvil.”
“For auction is a Yamaha DX7II-D Vintage Digital Synth. This is listed for parts as I am unable to get it to produce sound. Not sure if it’s because I don’t know what I’m doing or if it is actually broken. Could possibly be a battery on the circuit board. It does power on and most functions seem to respond on the display. Screws I’m the back/bottom do appear to have some rust and oxidation.”
“Yamaha DX7 II-FD Synthesizer Synth Keyboard. Condition is Used.”
“This DX7 is the IID model with Grey Matter E! installed. Fully tested to the best of my ability. I don’t have access to a breath controller, but everything else is confirmed working.
“auction for YAMAHA DX-7 SYNTHESIZER —61 KEYS—$45.95 S/H U.S.A. Insured # 17361
“Sounds and works great!! Vintage 1983 Yamaha DX7. Missing right side panel, otherwise in great condition! Just recently started playing it again, the sounds are amazing.”
“Yamaha DX7II-FD Synth – Original 80’s Synthesizer with Pedal and Book. Condition is Used. Shipped with USPS Parcel Select Ground.
“YAMAHA DX7, the awesome FM synthesizer with the world famous DX Electric Piano! Included is 2 Cartridges, One ROM cartridge is a memory cartridge and the other is a Orchestral Percussion and Complex Sound FX. Also included is a Pedal and soft Case. The keyboard is working excellently with no problems!” 
“Absolutely wonderful to play.
“Here is the famous original Yamaha DX7.
“Tested and in great working condition. The keyboard has minimal signs of usage except two very small cracks/dents that are pictured (9th and 11th) in this listing. They are very minimal and are barely noticeable, except when looking closely. Otherwise, In really great shape. Comes with two sustain pedals. One is a Yamaha FC5 and the other is a Generic Yamaha Sustain pedal (Not sure of exact model). Please use all pictures for details and for condition. ”
“1984 Mark 1 Yamaha DX7 FM synthesizer .
“Yamaha DX7
“In great condition. Just had key contacts cleaned and new internal battery installed. All buttons respond super well. No double pressing or hard presses required – responsive to light touch. Built like a tank and sounds outstanding. Comes with ROM cartridge.”
“Comes with huge library on CD and librarian/editor!
“Fully Functional. Keys feel really Nice on this one!
“Yamaha DX7, in excellent condition
“Yamaha DX7 Digital Programmable Algorithm Synthesizer w/ protective cover, external cartridge, and operating manual”
“Yamaha DX-7 Keyboard Synthesizer and carry case” 
“Working excellent condition Yamaha DX7s Synthesizer Keyboard with factory original ROM cartridge that has original factory preset voice and performance data. Includes Calzone hard shell case pictured. Recent new battery installed. Estate sale find. ”
“Excellent, fully working, no chipped keys, may have some minor scuffs and scratches.”
“Keyboard is in great condition and works great! Very clean! Includes hard case.
“Yamaha DX-7 Keyboard Synthesizer and carry case” 
“Yamaha DX7, in excellent condition