NC-UV0406-VI Light grating sensor replacement

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Proper NC-UV0406-VI Light grating sensor replacement​ restores reliable X-axis feedback for the dual Epson I1600-U1 printheads. The NC-UV0406-VI is an A2 desktop UV printer with 400×600 mm flatbed, 0–180 mm height, CMYK+W or CMYK+W+V up to 1200 dpi, FlexiPRINT MiniServer 22 Nocai Edition, 143W, AC 220/110V, and eco UV ink; it works best at 25–28°C / 35–65% RH. The light grating sensor reads the encoder strip and reports carriage position. A failed sensor causes drift, banding, wrong margins, or homing faults. Fitting a genuine Nocai sensor returns stable positioning.

Preparation

Power off and unplug the printer. Wear antistatic gloves. Open the cover and move the carriage to the middle of the beam. Prepare a Phillips driver, tweezers, lint-free wipes, ≥99% isopropyl alcohol, and a new OEM light grating sensor specified for NC-UV0406-VI. Photograph the sensor bracket, cable route, and connector position. Check the grating strip for dust or damage before replacing the reader.

Removing the Old Sensors

Locate the light grating sensor on the carriage body facing the encoder strip. Disconnect the sensor cable from the mainboard or intermediate connector. Remove the mounting screw and lift the old unit straight out. Inspect the lens, flexible cable, and bracket for ink mist, scratches, or looseness. Never touch the grating scale with bare hands. If only dust affects reading, clean first and retest before replacement.

Installing the New Sensor

Mount the new OEM sensor in the original orientation. Position its emitting/receiving face parallel to the grating strip and set the gap per the Nocai manual—verify the exact value for NC-UV0406-VI. Route the cable away from the carriage path, UV lamp, and power harness. Tighten screws lightly to avoid tilting. Confirm the sensor sits centrally in the strip window and does not contact the scale.

Homing and Accuracy Test

Power on and run the homing sequence; the carriage should read position smoothly without jumps. In FlexiPRINT, print an alignment grid and a ruler pattern, then measure printed size against design size. If margins drift, adjust the grating-sensor offset or recheck gap and connector. When X-axis feedback is stable and output size matches, the NC-UV0406-VI Light grating sensor replacement​ is complete and the printer is ready for production.

Post-Replacement Care

Keep the grating strip and sensor window clean with isopropyl wipes. Avoid pressing the carriage against the strip. Run weekly position checks under 25–28°C / 35–65% RH, and use only Nocai original sensors, ink, and spare parts to maintain accuracy and warranty support.