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HP Smart Tank 450 Printers - 'E4' Error (Paper Jam)

This document is for the HP Smart Tank Wireless 450, 455, and 457 printers.
The printer stops feeding pages, the control panel displays an alternating E and 4, and the Error icon , Paper Error icon , and Resume light blink. This indicates that paper might be jammed inside the printer.
Paper jams can be real or false. The printer might report a paper jam even when there is no jammed paper. The following steps apply to both real and false paper jams.
  note:
You might need a flashlight to complete some of these steps.
Figure : Flashlight
Flashlight
Step 1: Look for jammed paper
Paper jams can occur in multiple areas of the printer. If you cannot find the paper jam in one area, continue to the next area until the jam is located.
If you have checked and removed any jammed paper from each printer area and the error persists, continue to the next step.
Step 2: Make sure the carriage moves freely
To make sure there are no foreign objects or paper in the printer, move the carriage across the width of the printer.
  1. Turn on the printer, if it is not already on.
  2. Open the exterior door, and then open the printhead access door.
    Opening the exterior door, and then the printhead access door
  3. With the printer turned on, disconnect the power cord from the rear of the printer.
  4. Unplug the power cord from the power source or electrical outlet.
      warning:
    You must disconnect the power cord before reaching inside the printer to avoid risk of injuries or electric shock.
  5. Check for any paper or foreign objects that might be restricting the carriage, and then remove any paper or foreign objects that you find.
      caution:
    If the paper tears when you remove it from the rollers, check the rollers and wheels for torn pieces of paper that might remain inside the printer. If pieces of paper remain in the printer, more jams are likely to occur.
  6. Without engaging the printhead latch, reach inside the printer through the printhead access door, and then manually move the carriage.
    • If the carriage is stuck on the right side of the printer, move the carriage to the left side of the printer.
    • If the carriage is stuck on the left side of the printer, move the carriage to the right side of the printer.
    • If the carriage is stuck in the middle of the printer, move the carriage to the right side of the printer.
  7. Remove any loose paper or obstructions you find.
  8. Make sure the carriage can move freely across the width of the printer. Firmly push the carriage to the left side of the printer, and then to the right side.
  9. Close the printhead access door, and then close the exterior door.
  10. Reconnect the power cord to the rear of the printer, and then plug it into the power source or electrical outlet.
  11. Reconnect the USB cable, if necessary.
  12. Turn on the printer.
Try to print. If the error persists, continue to the next step.
Step 3: Clean ink smears
Cleaning ink smears can help clear paper jams and optimize print quality.
  1. Press and hold the Power button, press the Cancel button three times, press the Start Copy Color button eight times, and then release the Power button.
    The printer feeds one page slowly and makes mechanical noises.
  2. Wait until the printer is idle and silent before you proceed.
Try to print. If the error persists, continue to the next step.
Step 4: Manually clean the paper rollers inside the input tray area
Dust, paper fiber, and other debris might accumulate on the paper feed rollers and cause paper jams and paper feed issues.
  1. Turn off the printer.
  2. Disconnect the USB cable from the printer, if it is connected.
  3. Disconnect the power cord from the rear of the printer.
      warning:
    You must disconnect the power cord before reaching inside the printer to avoid risk of injuries or electric shock.
  4. Raise the input tray.
    Pull up the input tray
  5. Lift and hold the input tray shield.
      caution:
    Do not remove the input tray shield. The input tray shield prevents foreign debris from falling into the paper path and causing paper jams.
  6. Look through the open input tray, and then find the gray paper pick rollers.
    Photo: paper pick rollers
  7. Dampen a long cotton swab with distilled water, and then squeeze out any excess water.
  8. Press the swab against the rollers, and then rotate them upward with your fingers. Apply a moderate amount of pressure to remove dust or dirt buildup.
  9. Lower the input tray shield.
  10. Allow the rollers to dry for 10 minutes.
  11. Reconnect the power cord to the rear of the printer.
  12. Reconnect the USB cable to the printer, if necessary.
  13. Turn on the printer.
Try to print. If the error persists, continue to the next step.
Step 5: Reset the printer
Sometimes a paper jam error persists even though there is no jammed paper (false paper jam). Reset the printer, which might clear a false paper jam error.
  1. Turn the printer on, if it is not already on.
  2. Wait until the printer is idle and silent before you continue.
  3. With the printer turned on, disconnect the power cord from the rear of the printer.
  4. Unplug the power cord from the wall outlet.
  5. Wait at least 60 seconds.
  6. Plug the power cord back into the wall outlet.
      note:
    HP recommends connecting the printer power cord directly to the wall outlet.
  7. Reconnect the power cord to the rear of the printer.
  8. Turn on the printer, if it does not automatically turn on.
  9. Wait until the printer is idle and silent before you proceed.
Try to print. If the error persists, continue to the next step.
Service or replace your HP product if you completed all preceding steps.
To see if your product is still under warranty, go to the warranty check website http://www.support.hp.com/checkwarranty. Contact HP Support to schedule a repair or replacement. If you are in Asia Pacific, Contact HP Support to find a local service center in your area.
Repair fees might apply for out-of-warranty products.

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