Maintaining the HP LaserJet 4 Printer

• Introduction
• Cleaning the printer
• Printer Cleaning Tasks
• The Toner Cartridge
• Extending Toner Cartridge Life
• Clearing the TONER LOW Message
• User-Replaceable Parts
• Multi-Purpose (MP) Tray Paper Pickup Roller and Separation Pad
• Paper Cassette Pickup Roller
• Transfer Roller
• Fusing Assembly
• Lower Cassette Pickup Roller (not applicable to HP printers at ING )

Introduction

• Cleaning the printer
• The toner cartridge
• Extending toner cartridge life
• Clearing a TONER LOW message
• Replacing printer parts

Cleaning the printer

• Every time you change the toner cartridge
• After printing approximately 6,000 pages
• Whenever print quality problems occur

To avoid permanent damage to the toner cartridge, do not use ammonia-based cleaners on or around your printer.

Printer Cleaning Tasks

Do not touch the transfer roller (black sponge-rubber roller) with your fingers. Skin oils on the roller can cause print quality problems.

If toner gets on your clothes, wipe it off with a dry cloth and wash your clothes in cold water. Hot water sets toner into fabric.

Avoid touching the adjacent fusing area. It may be HOT

1. OPen the printer's top cover and remove the toner cartridge
2. with a dry lint-free cloth, wipe any residue off the Paper Access Cover (it has a green handle) and the adjacent silver metal strip.
3. Wipe any dust or dirt off the black plastic Paper Feed Guide with a dry, lint-free cloth.

The Toner Cartridge see the printed book pending update of this page

Extending Toner Cartridge Life

Clearing the TONER LOW Message

User-Replaceable Parts

Switch OFF and unplug the printer before replacing parts. Failure to do so may result in personal injury or damage to the printer. After switching the printer OFF and unplugging the power cord, allow the printer to cool for 30 minutes before replacing the parts.

Ordering Information

Multi-Purpose (MP) Tray Paper Pickup Roller and Separation Pad

1. Open the Multi-Purpose (MP) Tray.
2. Grasp the black plastic Envelope Feed Access Cover as shown, and pull it downward and toward you to remove it.
3. Read all of this step before proceeding. Remove the pickup roller by pushing down on the plastic retaining clip with your right index finger (see inset A) while sliding the roller to the right with your left index finger. When the roller is partway to th right, push in on the small plastic tab (see inset B) behind the right end of the roller and fully remove it.
4. Insert a flat-blade screwdriver into th indentation at the front of the separation pad and twist the screwdriver blade gently to loosen the pad see (inset). When loose, gently lift pad from its seat.
5. To install a new separation pad, place it over the opening and press it down firmly with your forefinger to seat it. Be sure the metal edge is toward the front of the printer.

   To install a new Multi-Purpose (MP) Tray Paper Pickup Roller, slide it over the shaft, then rotate it so that the flat side of the new roller is aligned with the flat side of the shaft. Then slide th roller to the left until it clicks into place.

6. Reinstall the black plastic Envelope Feeder Access Cover and discard the used roller and pad.

Paper Cassette Pickup Roller

1. Remove the toner cartridge.
2. Remove the Paper Cassette.
3. place the printer on its left side so that the bottom of the printer is easily accessible.
4. Remove the pickup roller by pinching the release clip and sliding the roller off the shaft (the new roller will be installed in the reverse order). Slip the new roller over the shaft and rotate it until properly aligned. Slide the roller along the shaft until it clicks into place.
5. Place the printer upright, then place the toner cartridge, Paper Cassette, and power cord. Switch the printer ON.

Transfer Roller

Fusing Assembly

Lower Cassette Pickup Roller