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A batch of power boards produced in early 2021 used capacitors from a sub-supplier. These fail after 8-10 months of continuous use. Symptoms: random E-099, then failure to power on. Fix: Replace the main filter capacitor (digikey part # 493-15855-ND) or order updated PCB (Siruba # PCB-818-21B).
Many 2021 units shipped with a more sensitive Hall sensor. After a few months, the magnet on the handwheel weakens or shifts. Fix: Re-calibrate using the manual “Needle Positioning” mode (Parameter P-15: Adjust needle up/down angle to 145° and 325° respectively). siruba+l818fm1+error+list+2021
The magnetic safety switch on the looper cover door is prone to magnet misalignment after repeated opening/closing. Fix: Glue a small neodymium magnet (5mm x 2mm) onto the door’s existing magnet to strengthen the signal. A batch of power boards produced in early
Menu → Diagnostics → Error List → Select error code → View details Many 2021 units shipped with a more sensitive Hall sensor