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Choose the Symptom You See

These are inspection directions, not confirmed diagnoses. Different printers use different feed, tension, roller, encoder, and motor arrangements.

Confirm the Roll Is Loaded Square

• Reload the roll so it sits fully and evenly on the spindle or holders.
• Compare the left and right media edges against fixed machine references.
• Remove slack, then confirm tension feels even across the width.
• Check that the take-up direction and tension are not pulling harder on one side.
• Inspect the leading edge for a diagonal cut, curl, adhesive, or damage that can start the feed at an angle.

Look for Drag, Dirt, and Uneven Roller Grip

• Check the platen and media path for adhesive residue, scraps, powder, dust, or a raised edge.
• Inspect accessible pinch and drive rollers for contamination, flat spots, cracking, or uneven pressure.
• Confirm media guides are not pinching one side or catching the roll edge.
• Separate media expansion or curl from mechanical skew by testing a short clean section with the correct media profile.

If the media feeds straight by hand but slips only during driven advance, record the exact position and sound. That evidence helps separate surface drag from a drive-system problem.

Check Settings and Feed Calibration Before Hardware

• Confirm the media type and thickness setting match the material actually loaded.
• Run the printer manufacturer's media-feed or advance calibration procedure.
• Compare a short test without take-up tension against the same test with the take-up system engaged.
• Note whether the error is a steady scale difference, periodic slip, or sideways movement; these patterns suggest different inspection paths.

Calibration can compensate for normal feed variation, but it should not be used to hide a slipping pulley, loose belt, contaminated roller, or unstable motor connection.

Inspect the PF Motor, Belt, and Pulleys

• Listen for repeatable clicking, pulsing, grinding, or a motor that stalls under load.
• Inspect the belt for missing teeth, polishing, cracking, contamination, or inconsistent tension.
• Check pulleys for loose set screws, tooth damage, bearing play, shaft movement, or belt misalignment.
• Inspect the motor connector and cable route for looseness or damage after powering down according to the service procedure.
• Compare the removed part against its label, shaft, connector, mount, tooth count, pitch, bore, width, and bearing—not appearance alone.

Product references such as PF Motor Assembly DF-49020, 20 / 24-Tooth Motor Pulley, 25-Tooth Aluminum Idler Pulley, and 100:25-Tooth Drive Pulley for 9000 / 9100 Printers can help with visual comparison. They are not universal replacements.

Collect the Details Needed to Match Parts

• Printer brand, exact model, serial/nameplate photo, and error code
• Original motor label, voltage/current information, connector, wire count, shaft diameter, shaft length, and mounting points
• Pulley tooth count, pitch, bore, width, bearing number, set-screw location, and photos from both sides
• Belt width, tooth profile/pitch, length or tooth count, and routing photos
• The symptom timeline: immediate skew, gradual walking, periodic slip, wrong advance length, noise, heat, or failure only with take-up tension

Send this evidence to Cathy@icolorpro.com before ordering when the fit is unclear. Similar-looking motors and pulleys can use different shafts, connectors, mounts, ratios, and belt profiles.

FAQ

Why does the media start straight and then move sideways?

Uneven take-up tension, drag on one edge, roller contamination, roll misalignment, or intermittent drive slip may become more visible as the job gets longer. Compare a short test with and without take-up tension.

Does media skew mean the PF motor is bad?

No. Loading, spindle seating, roller grip, guides, media curl, calibration, belt condition, pulleys, and the encoder/feed system can create similar symptoms.

Can feed calibration fix mechanical slipping?

Calibration can correct normal advance error, but it cannot reliably fix a loose pulley, damaged belt, weak roller grip, or unstable motor connection.

Can I choose a pulley by tooth count alone?

No. Confirm pitch, bore, width, bearing, ratio, shaft fit, set-screw position, belt profile, mounting structure, and the original-part photos.