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Poland here. As i mentioned, i have fully working CTK 750 but i don't want to destroy it to repair CTK 1000. It would be a crime since CTK 750 is also very nice keyboard. I will wait for some broken 750. Good information it's not very rare here. I have even an option to buy another one CTK from my city for 75$ so maybe i'ts a matter of time when broken 750 will appear somewhere. btw im a little dissapointed by the quality of some (not all) voices both in CTK 750 and CTK 1000 - i found them inferior to the older Casio CT-X1 - which is the top of the line earlier series from 1992, similar to CT 670/680 but with reverb and chorus effects and famous green tone edits, also premium case. For example preset "Cathedral" is absolutely gorgeous choir pad in Ct-x1 and in ctk-1000 its way worse organ tone. Also piano sounds weaker in the CTK 750 comparing to CTK 750 (in CTK-1000 it sounds nice). Good that CTK -1000 have nice acoustic tone guitar, very dreamy. But in ctk 750 it lacks something. And it lacks the great syntheseizer feature. I wonder why they made a worse product in next generation - the velocity sensitive version of the CT-X1 would be really great.

my experiences with conductive paint is that it needs to have be thick layer, so it won't work here, as the traces on pcb are really small. i will trie with wires, but it seems to be a very difficult and precise task. I've recently got working CTK 550 which has M615T-KY1M and it doesn't fit. So i need to look for some broken cheap CTK 750

"ONLY the TONE BANK series of which yours falls into, disabled the accompaniment section and only made the keyboard tone module mode." And In the later series - CT 470/670 etc. the MIDI mode disabled the syntheseizer function (the one with green panels) which is quite sad, because it's great feature of this keyboard. Anyway, looks like Casio PMP differs only in more "professional" colours of the buttons / sliders/case but sound is exactly the same as its counterparts.

OK - here is how the other site of one PCB looks like. As you see, very bad. Don't know if there is another option for the rescue, than finding broken CTK 550/650/750/1000 or ct 700/770 (all of them have velocity, but only for 750 im sure it has the exactly same PCB on keybed...) "r. But the general layout (count of rows x columns) matters (most Casios use 6er groups) and if it has velocity " Also i think the problem if the shape of PCB is the same, because it can have holes for screws in another parts or different cable to connect to the main pcb

Hi! Thanks for the answers. I think the format of the keys are not everything - keys may be the same in various models, but the metal frame and the keyboard PCB may be different. I can surely repair plastic contacts - i've done it many times with tv remote control repair kits. But the M615T-Ky1m and M615T-Ky2m PCBs are gone. No chance for repair. I've done it in the past in other cases using conductive paint or glued wires, but it was when 1 or 2 paths were gone. here 75-80% of the PCB conductive paths are rusted. I don't think it's not from the battery leakage - battery is ok. Maybe someone leaked a beer on keybed? I don't know. Also all the other things except keybed are working and have no signs of rust. I wonder if this PCB has to be be from the model with same polyphony (32) since the keyboard matrix. What do you think? I have chance to buy quite cheap broken ctk 650 but not sure if it gonna fit, because M616T-KY1M/KY2M may look different.

Hi! i've recently buyed an very rare Casio CTK 1000 from 1993. Everything is working, except the keybed. I've got access to it by a external MIDI controller, but through MIDI you can't edit the sounds, which is quite important feature of this model. I would also like everything to work fine in this wonderful piece of gear. The keybed PCBs are totally rust, no hope for rescue. I need to two spare PCBs labeled: M615T-KY1M M615T-KY2M I found that the same was used in the CTK-750 (due to the service manual). I've got 750 but since it's fully working, don't wan't to discard it. Also close relatives from the same time are CT 700 and CT 770 - i wonder if they have the same PCB? There are no service manual or information on the web. I also found that CTK 650 (close relative to 750) have the PCB M616T-KY1M/KY2M - anybody knows if it's compatibile? Regards