![]() ![]() I started with using the Deoxit D5 on all of the connections to see what was dirty and corroded and what actually needed repair. A few nice touches that remind you that you are performing surgery on a lovingly designed artistic instrument, not just another mass produced piece of electronics. There is an elaborate Buddha, some ancient / alien looking symbols and even a cluster of mushrooms and flowers all imprinted in raised silver. (I always wait several hours before powering up a circuit board after cleaning it with any solution) The circuit board itself had a surprising amount of artistic customization. I started by cleaning the board with a small amount of alcohol on paper towel and q-tips. Now it was time to clean up circuit board, repair loose connections and recondition the pots and switches. ![]() The wood sides were in great shape and only needed some furniture polish. The outside shell needed some light soap and water, and a bit of all purpose orange cleaner. Most of the basic internal cleaning was done with air bursts and a small amount of 90% isopropanol alcohol on a rag. I half expected to find a dead rat wedged in there. Step number one was to completely break down the Pro One and clean every square inch! There are plenty of tutorials out there on how to take apart a Pro One, so I will not go through every screw here. Deoxit F5 is a fader lube and it works wonders on sticky / frozen / scratchy faders, pots and switches. Many of the problems with this unit were simply fixed by cleaning the connections with D5. Deoxit D5 is a contact cleaner and an amazing tool for cleaning and caring for vintage electronics. 90% isopropanol alcohol is usually a good cleaning choice for electronics since it evaporates so quickly. I hunted for a serial number below 8500 to ensure that I was dealing with the J-wire keyboard setup, but above 1500 to avoid having a unit with the main power supply mounted to the circuit board which reduces durability.įirst let's talk cleaners and solutions. The Pro One's with serial numbers under 8500 are equip with the stable and easy to repair J-wire style keyboard, while serial numbers above 8500 have the more troublesome and difficult to repair membrane keyboard. Pro One buying 101 starts with serial numbers. There were a few other problems, but I don't remember them now. The housing was dirty, the pots were scratchy, the unit only powered up intermittently, the audio was buzzy, the keyboard keys were uneven and several were non-functioning, at times the unit only produced noise in the drone mode and the CV pitch and note scale were off causing out of pitch notes no matter how carefully you tuned the oscillators. Please see my other sales for more great gear and parts.Sequential Circuits Pro One (Repair and Reconditioning)īuying a mint Pro One was not an option at today's high prices, but I found a good deal on eBay and was convinced that I could recondition it myself. Install I updated the handling to 2-days to given all the "fun" USPS is having and COVID, etc. ![]() If you want MIDI hardware included see my item TurboCPU+MIDI. ![]() Optional: If you want to make your own MIDI interface, instructions are in the manual.Sequence End mode lets you "chain" the two sequences.Sequence Tie mode allows for a variety of note lengths.Power-on settable parameters for clock start mode, arpeggio up/down mode and arpeggio gate time.Sequences are retained in memory even after power-down.Each sequence can be up to 256 steps (compared to total of 40 steps on the original).Supports the original functionality including the sequencer and arpeggiator.Bring that old Pro One back to life or simply have a spare for the "unobtanium" 8021. This is a newly developed (modern) replacement CPU for the Sequential Circuits Pro One 8021. Sequential Circuits Pro One TurboCPU: replaces 8021, adds features, NEW By MTG.: Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Sequential Circuits Pro One TurboCPU: replaces 8021, adds features, NEW By MTG. ![]()
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