Sharp Error F2-64 — What It Means & How to Fix It
By Ryan Green · Updated August 2026 · Independent guide · PrinterCare USA LLC (not affiliated with any printer manufacturer)
The Sharp F2-64 error is a toner density sensor malfunction that prevents your printer from accurately detecting toner levels and print quality. This error stops all print jobs and can be frustrating, but it is one of the more straightforward sensor errors to diagnose and fix yourself in most cases.
This guide covers the real technician steps used across Sharp's copier and printer lines in the United States, from basic sensor cleaning through drum unit replacement. We will walk you through each step in order of difficulty so you can try the simplest fixes first.
How to fix it — step by step
- Power cycle the printer completely. Turn off the Sharp printer using the main power switch and unplug it from the electrical outlet. Wait for a full sixty seconds to allow the internal capacitors to discharge completely. Plug the printer back in and power it on, then run a test print to see if the error clears on its own.
- Locate and inspect the toner density sensor. Open the front access panel or toner cartridge door depending on your Sharp model. Look for a small optical sensor mounted near the toner cartridge or drum unit area, usually marked with a label or icon. The sensor will appear as a small plastic or metal component with a lens window facing the toner path.
- Clean the sensor lens with proper technique. Use a dry, lint-free cloth or coffee filter to gently wipe the sensor lens in one direction only. Do not rub in circular motions or apply pressure, as the internal components are delicate. If visible toner dust or debris is present, you may lightly dampen the cloth with distilled water, but never use solvents or alcohol.
- Check the toner cartridge seals and contacts. Remove the toner cartridge from the printer and inspect the gold electrical contacts on both the cartridge and the printer for corrosion or dust buildup. Wipe these contacts gently with a clean, dry cloth. Reinsert the cartridge firmly until you hear a click, ensuring it is fully seated in the printer.
- Verify the drum unit is not damaged or worn. Open the printer and visually inspect the drum unit for scratches, cracks, or dark streaks across the green or brown drum surface. If the drum shows visible damage, it must be replaced regardless of cleaning. The drum unit typically lasts between forty thousand and one hundred thousand pages depending on your Sharp model.
- Replace the drum unit if sensor cleaning fails. Order the correct drum unit for your specific Sharp model number by checking your printer's specifications page. Power off the printer, open the main access panel, and remove the old drum by pressing the release tabs on both sides. Slide the new drum into the cartridge bay, align the gears, and push until the unit clicks into place.
- Run a diagnostic test to confirm the sensor is reading. After reassembly, navigate to your printer's service or diagnostics menu through the control panel display. Select the sensor diagnostic or toner density test option if available on your model. The test will report whether the sensor is responding correctly and provide a numerical reading.
- Contact Sharp support or use remote diagnostics if the error persists. If the F2-64 error remains after cleaning and drum inspection, the sensor itself may be faulty or there may be an internal circuit board issue. You can contact a Sharp certified technician for a forty-nine dollar remote diagnostic session, or a local service representative can visit your location for an in-person evaluation and repair.
Still stuck? A technician can fix it remotely today.
Independent remote support — you watch every step, and you pay the flat $49 only after your printer is working. $0 if we can't fix it.
Frequently asked questions
What causes the Sharp F2-64 error in the first place?
The F2-64 error occurs when the toner density sensor fails to detect toner level or quality due to dirt buildup on the lens, a worn or damaged drum unit, a faulty sensor, or internal circuit board failure. Toner dust accumulation is the most common cause and can be resolved with cleaning in roughly seventy percent of cases.
Can I keep printing with the F2-64 error, or will it damage the printer?
You cannot print while the F2-64 error is active, as the printer will lock out all print jobs for safety reasons. Attempting to override the error or disabling the sensor will result in poor print quality and potential damage to the drum unit or fuser assembly, so it is best to resolve the error properly before resuming work.
How much does a replacement drum unit cost for a Sharp printer?
Replacement drum units for Sharp printers typically cost between ninety nine dollars and two hundred twenty five dollars depending on your specific printer model and whether you purchase genuine Sharp parts or compatible third-party alternatives. Most businesses and home users choose genuine drums to avoid compatibility issues and maintain print quality.
Is the F2-64 error covered under my Sharp printer warranty?
The F2-64 error may be covered under warranty if it results from a manufacturing defect, but it is typically not covered if the cause is toner dust accumulation or normal wear of the drum unit. Check your specific warranty documentation or contact Sharp customer service with your model number and purchase date to confirm coverage.