Roland System 100 Model 101 – Extensively Serviced

Selling my vintage Roland System 100 Model 101 analog synthesizer, complete with its original manuals. Extensively serviced by Synths When Inc. in Toronto on October 15, 2026, including repairs, cleaning, tuning, and calibration. It looks and sounds great. All keys, functions, controls, and outputs passed the technician’s final testing. Detailed service documentation is included. The work described in the report is provided below. Asking $4500 CAD. Located in Niagara Falls, Ontario. Local pickup preferred. Serious buyers are welcome to try it. SERVICE REPORT — Synths When Inc. Roland System 100 Model 101, serial number 500954 Confirmed low master output volume, crunchy sliders, an intermittent lowest D key, an unattached wire at the Sync Out jack, degraded square wave performance, and loose Noise White/Pink switch function. Also noted that the reported drone/“reverse” envelope behaviour occurs when the Initial Gain fader is raised; envelopes function normally with it lowered. Opened synth, cleaned and lubricated all faders, pots, and switches, reattached the loose Sync Out wire, and repaired the detached Noise switch body to restore full switching capability. Cleaned the keybed bus bars and key contacts, resolving key contact and pitch drift issues on the lowest D key, realigned internal wiring where concerned. Replaced all power supply capacitors. Traced the square wave fault to previous repair work, where a supply filter capacitor with a lifted pad had been soldered to a neighbouring diode; installed a new capacitor correctly routed and replaced the diode, and square wave and PWM now work properly. Found and replaced a faulty op-amp to restore full LFO functionality. Discovered overall intermittent performance on play-test. Found and repaired suspect previous repair work, including repairing lifted PCB traces, reflowing cold joints on various capacitors across the VCO & VCF/VCA boards, and completed full tuning and calibration procedures. Full inspection of all wire points to the PCBs; all weak wire joints were repaired. Reassembled, cleaned aesthetically (including removing old tape residue from the panel and vacuuming the interior), replaced 3 missing fader caps and 4 missing panel screws, and performed final quality control play-tests; all keys, functions, envelopes, controls, and outputs (High, Low, and headphone) test good and the System-100 Model 101 sounds great!