"This auction is for a new Korg Polysix KLM-367 PCB Assembly. If you are looking I'm sure you know this is the infamous PCB Assembly that gets damaged from the NiCd battery corrosion. The PCB is the popular clone from Jed Jorgensen The PCB is professionally assembled and includes all of the components except for the uPD8048C-345 Mask ROM that must being transferred from another board (presumably the old board it will replace). All IC's are placed in machined IC sockets. The board has a high capacity CR2450 Lithium battery for several decades of memory backup.
All of the components on the PCB are new except for the following:The uPD8048C-345 Mask ROM is not placed. A socket is installed and waiting for a donor.
The two LM13600 dual OTA's may be new or re-used. When the original Korg selected LM13600's are working and show no signs of corrosion they are re-used. When they are not working or show sings of corrosion they are replaced with new LM13700's.
The NTC Thermistor is re-used from the old board. The connectors are re-used from the old board as they are no longer available.
The PCB assembly is tested on a test unit and is guaranteed working. If you have a Polysix that is no longer working and has battery corrosion the new PCB assembly may fix the problem. The board is plug and play and can be swapped out with little effort, although I would caution that you still need the correct tools & test equipment to successfully calibrate the new board. For this reason I would also advise to have it fitted by an experienced tech as calibration can be tricky and they will also be able to identify other issues. You should not assume that if you have a non-working Polysix with battery corrosion that the corroded PCB is the only problem.
If you do decide to install it yourself and you are not very experienced I would make sure at the very least to check the power supply voltages before plugging in the new board. If you get so far as having swapped out the board only to turn on the unit and find the program and bank LED's are randomly lit and it doesn't work right.. this is generally directly related to the calibration of the KLM-367A. You must complete the calibration procedure before the Polyix will operate correctly.
If you want to return your old board to me I am usually interested in buying it back for a 'core' refund of $35 plus postage so I can re-use the connectors and thermistor on a future build.
Please do not contact me during or after the auction to inquire about additional PCB assemblies. This is not a profitable venture and I only make a few extras to help out the synth community when I need one or two. Anytime I have one available it will be listed on Ebay."
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