"Welcome to my documentation of the odyssey repairing some Poly-61s, as i recently bought 3 of them with the intention to get at least 2 of them working perfectly. If you want to repair a Poly-61, i have to warn you - it is quite a lot of work to get it perfectly working again, if it has the full repertoire of usual problems of this synthesizer. First of all, if you don't want to do a full restoration, you should know a bit about the inner workings of the Poly-61. This is where i want to start. So let's have a look at the anatomy of the Korg Poly-61."
Update: unfortunately the link above is gone. I found the following from Really Nice Audio:
POLY61 RepairS video upload by Really Nice Audio
"By changing the switches and cleaning the keyboard contacts you can bring a synth back to its former glory."
Excellent writeup! Nice job.
ReplyDeleteSeems to me that the Poly61 uses the same rechargeable battery as the Polysix which SHOULD be replaced with a NiCA one instead, otherwise corrosion from the battery acid will eventually get onto the boards. Check out The Old Crow Battery-reapir site ;)
ReplyDeleteSorry, that should be CHANGE the NiCa to a safer new Lithium battery... :)
ReplyDeleteYes, that's the best way. But as i wrote in the text, you have to modify the circuitry a bit then, as you can't just remove the charging resistor - as this resistor also is the feeding resistor. A diode helps. Or my solution with the battery pack put away from the board. The board with the green NiCd-Battery is just currently in this form, as the battery is nearly new and i don't expect problems with it the next years.
ReplyDeleteHi Mik. I can`t find your fatastic video anywhere. Can you please repost it somewhere. Thank you. :-)
DeleteHallo MiK, ich wäre auch sehr an Deinem Text und dem Video interessiert. Wäre es möglich das nochmal zu veröffentlichen? Danke
ReplyDeleteJa, bitte das Video wieder online stellen! LG
ReplyDelete