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HP Deskjet 842c Printer support

Cleaning and Maintaining the Printer

  • PrintPrint

Introduction

This document will explain how to maintain and clean the HP Deskjet series printer and print cartridges. Since this document contains instructions, it may be advisable to print it out as a reference.

Printer case exterior

Inkjet printers print by spraying a fine mist of ink from the print head onto the paper. In some situations, small amounts of ink from the printing process may be deposited on the printer case and become visible over time. If this situation occurs, the exterior of the printer can be clean with a soft cloth moistened with water to remove ink deposits, dust, smudges, and fingerprints (see Figure 1 below). A mild detergent may be used if necessary on the exterior. Do not use harsh household cleaners as they may damage the finish on the printer case.
Figure 1: Cleaning the exterior

Printer interior

All Inkjet printers produce a small amount of ink residue that may build up inside the printer's case. This is normal. There is no need to clean this residue. Platen cleaners or alcohol may damage the HP Deskjet 800 series printer and should not be used. Cleaning the interior of the printer should be limited to cleaning only the print cartridges. Do not clean anything else inside the printer. Keep all liquids away from the inside of the printer
CAUTION: Do not clean or lubricate the carriage rod. Cleaning or lubricating the rod may reduce its life. The ink present on the rod will not hinder the operation of the product.
NOTE: The carriage rod is the shaft inside the printer that the print cartridges move back and forth on.
Accumulations of paper or lint should be carefully removed by brushing the loose material onto a cloth or by using a small computer vacuum cleaner.

Cleaning the paper feed rollers

  1. Remove any paper in the paper tray assembly.
  2. Remove the paper tray assembly.
  3. Open the top cover.
    WARNING: The proper moistening agent to use for this operation is Distilled Water. Tap water may be used if distilled water is not available. Use of alcohol or other agents may damage or reduce the life of the rollers.
  4. With the top cover open, use a clean moist cloth to clean the three paper feed rollers. You may press the RESUME button to rotate the rollers, however, be careful not to allow the cloth to be pulled into the printer by the rotation of the rollers.
    NOTE: If the printer has a rear access door, remove it and access the rollers from the back of the printer.
  5. Install the paper tray assembly, close the top cover or door, and load paper in the printer.

Maintaining the Inkjet print cartridges

Although print cartridges require no routine maintenance, proper use and handling of them will help ensure optimum print quality and print cartridge life.
Do not unplug the HP Deskjet 800 series printer before printing is complete and the print cartridges have returned to their "home" position on the right side of the printer. Instead, use the POWER button to turn off the printer. This will keep the print cartridges from drying out or becoming clogged.
Store new print cartridges in their original sealed packages at room temperature until ready for use. If installing print cartridges that are too warm or too cold, the best print quality will not be achieved until they reach the same temperature as the printer.
After opening a new print cartridge, always keep it in the print cartridge cradle (inside the printer) to keep it from drying out or becoming clogged.

Cleaning the Inkjet print cartridges

Cleaning your ink cartridges can improve the quality of printing. If your printed page is missing lines or dots, or if it contains ink streaks, perform Procedure 1 in this section. If problems persist after performing Procedure 1, perform Procedure 2 in this section.

Procedure 1: Correcting missing lines or dots

Clean the ink cartridges when you notice that lines or dots are missing from your printed text and graphics, as shown below:
Figure 2: Lines or dots
The ink cartridges can be cleaned from the HP Toolbox in the Windows environment.
Use the Services tab in the pulled down menu from print dialog window in the Macintosh environment.
NOTE: Do not clean the Inkjet print cartridges unnecessarily, as this wastes ink and shortens the life of the cartridge.
To clean the ink cartridges from the HP Toolbox in the Windows environment:
  1. Double-click the HP Toolbox icon on the computer screen.
  2. Click the Printer Services tab.
  3. Click Clean the print cartridges and follow the directions on the screen.
If print quality improves by going through this sequence once, but the quality is still not quite good enough, repeat the procedure. Start at Step 1, or click the Clean Again button on the last cleaning window. There is no harm done, only a little wasted time and ink.
If this process does not improve the print quality, the ink cartridges might be low on ink. See the document provided with the black Inkjet print cartridge for how to use the ink level sensor to determine if the cartridge is low on ink. Replace the ink cartridges, if appropriate.
Also, dust fibers occasionally drag through the ink and streak it. If problems persist, continue with Procedure 2.
To clean the Inkjet print cartridges from the Services tab in the Macintosh environment:
  1. Select Print from the File menu
  2. Select the Services tab from the pulled down menu.
  3. Click Clean ink cartridges before printing
  4. Select Simple Clean, Clean or Super Clean.
If this process does not improve the print quality, your ink cartridges might be low on ink. See the document provided with the black ink cartridge for how to use the ink level sensor to determine if the cartridge is low on ink. Replace the ink cartridges, if appropriate.
Also, dust fibers occasionally drag through the ink and streak it. If problems persist, continue with Procedure 2.

Procedure 2: Eliminating ink streaks

If you use your HP Deskjet printer in a dusty environment, you might occasionally experience ink streaks due to a small accumulation of debris inside the HP Deskjet printer.
Figure 3: Ink streaks
This debris can include dust, hair, carpet, or clothing fibers. Ink streaking is easily prevented or corrected by cleaning two areas of the HP Deskjet printer:
  • The ink cartridges
  • The Inkjet print cartridge cradle

Materials you will need

Before you start, make sure you have the following materials available:
  • Cotton swabs or any soft material that will not come apart or leave fibers (for example, a piece of clean cotton cloth, such as a handkerchief).
  • Distilled, filtered, or bottled water. (Tap water may contain contaminants that can damage the ink cartridges.)
  • Scrap paper or paper towel on which to set the ink cartridges while you are working.
    CAUTION: Be careful not to get ink on your hands or clothing.

Remove the Inkjet print cartridges

  1. Turn the HP Deskjet printer on and lift the printer's top cover. The ink cartridges move to the center of the printer.
  2. After the ink cartridges have moved to the center of the HP Deskjet printer, unplug the power cord from the back of the printer.
    Figure 4: Unplug the power cord
  3. Remove the ink cartridges from the cradles and place them with the widest side down on their sides onto a scrap piece of paper.
    WARNING: Keep new and used Inkjet print cartridges out of the reach of children.
CAUTION: Once you have removed the Inkjet print cartridges, make sure that they are not outside of the printer longer than 30 minutes.

Cleaning the Inkjet print cartridges

  1. Grasp the top of the black ink cartridge.
  2. Dip a clean cotton swab into distilled water and squeeze any excess water from the swab.
  3. Clean the face and edges of the ink cartridge as shown. Do not wipe the nozzle plate.
    Figure 5: Clean the Inkjet print cartridge
    CAUTION: Be careful not to touch the ink nozzles on the bottom of the print cartridge or the copper contacts on the back of the print cartridge. Touching these parts of the Inkjet print cartridge can result in clogs, ink failure, or bad electrical connection.
  4. Hold the ink cartridge up to the light to inspect for fibers on the face and edges. If fibers are still present, repeat Steps 2 and 3.
  5. Repeat steps 1 through 4 with the tricolor ink cartridge, using a clean, moistened cotton swab to avoid any contamination.

Cleaning the Inkjet print cartridge cradle

  1. Position yourself at eye level with the printer.
  2. Locate the cradle that held the ink cartridges.
  3. Using clean, moistened swabs, wipe the underside of each wall of the carriage where fibers may collect and come in contact with the paper. Repeat until no ink residue is seen on a clean swab.
    Figure 6: Clean the underside of the carriage

Reinstall the Inkjet print cartridges

  1. Reinstall the ink cartridges and close the printer's top cover.
  2. Reinsert the power cord into the back of the printer.
  3. Print a test page. On the Printer Services tab of the HP Toolbox, click Print a self-test page.
  4. Examine the printout for ink streaking.
    NOTE: This procedure should remove all fibers that would cause ink to streak on a printout; however, fibers can be missed. If the printout still shows streaking, repeat the procedure until the test printout is clear and sharp.
HP Deskjet 842c Printer

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