![]() ![]() (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. 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. ![]()
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