NC-UV0609MAX-II X-axis small belt replacement

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Proper NC-UV0609MAX-II X-axis small belt replacement​ restores quiet carriage drive on this 600×900 mm industrial UV printer. The beam uses an X-axis motor with driven and driving pulleys, an encoder strip for position feedback, and an origin sensor for homing. The machine prints 0–180 mm height with Epson 13200-U1 white, 13200-U1HD color and 11600-U1 varnish, CMYK+LC+LM+LK+LIK+W+V at 720×600/900/1200 dpi, FlexiPRINT 22, 470W, AC 220/110V, negative-pressure eco UV ink, 25–28°C / 35–65% RH. A stretched small belt causes jerky travel, banding and misregistration; an OEM belt returns accurate motion.

Preparation

Power off, unplug and verify grounding. Wear antistatic gloves and ensure good lighting. Through the panel, driver or FlexiPRINT, move the carriage to the beam center. Prepare an OEM Nocai small belt with correct length and tooth profile, hex keys, Phillips driver, tension gauge or ruler, tweezers and bracket photos. Do not touch the encoder strip, origin sensor or printheads during setup.

Remove the old belt

Open the cover and locate the small belt at the motor end of the beam. Loosen the tensioner until the belt slackens, then slip it off the motor pulley and idler pulley. If the route passes a carriage clamp, release the clamp screws first. Remove the old belt and inspect pulleys for worn teeth, debris, oil and playback marks. Clean the pulley grooves before fitting the new belt.

Install and tension the new belt

Route the OEM belt over the motor pulley and idler pulley along the original path; insert the carriage clamp if fitted. Apply initial tension with the tensioner, then check deflection between pulleys per the Nocai manual. Keep pulleys parallel, avoid twists, and tighten locknuts evenly. Rotate the motor by hand to confirm smooth tooth engagement without noise or skip.

Alignment and calibration test

Power on and jog the carriage across the full width; the encoder readout should increase smoothly without jumps. Run the service auto-alignment routine, then print nozzle, step and bidirectional patterns. If banding remains, recheck tension, pulley parallelism and encoder cleanliness. When travel is quiet and registration is correct, the NC-UV0609MAX-II X-axis small belt replacement​ is complete.

Post-replacement care

Recheck tension after 8 hours of operation, then weekly for the first month. Keep pulleys clean with a dry cloth, lubricate beam rails per manual, and avoid ink or solvent contact with the belt. Use only Nocai original belts and eco UV ink, and maintain 25–28°C / 35–65% RH.