Service manual

MAINTENANCE

Section 6 - Maintenance

This section covers how to care for the ink cartridges, clear paper jams, replace the sheet separators, and perform

routing maintenance on the printer.

The Inkjet Cartridge

The inkjet cartridges must be replaced when out of ink, when print quality is poor, or when purging and cleaning

have not helped the image quality.

The Approximate life of the HP 51645A Inkjet cartridges based on three lines of 20 characters at 10-point size per

address is:

600 x 600 DPI 50,000 addresses

600 x 300 DPI 100,000 addresses

600 x 200 DPI 150,000 addresses

600 x 150 DPI 200,000 addresses

NOTE: These figures can vary depending on the font selected.

To Replace the Inkjet Cartridge:

• Remove the used cartridge from the cartridge holder by raising the latch lever to release the cartridge, and

then pull the cartridge up and out of the holder.

• Remove the new inkjet cartridge from its packaging, taking care not to touch the copper contacts, the metal

plate, or the gold printhead. Remove the protective tape from the printhead.

• The cartridges are held in place by a lever mounted on the inkjet cartridge holder. Release the lever by

raising it vertical.

• With the cartridge’s printhead pointing down, slide the cartridge into the holder and push down and toward

the contacts in the holder.

• Make sure the cartridge is seated in the holder then close the lever to secure the cartridge in the holder. Do

not force the lever into place.

• Repeat the above for the remaining cartridges.

CAUTION

NEVER SHAKE, DROP, OR HIT THE CARTRIDGE AGAINST THE PALM OF YOUR HAND

OR ANY OTHER HARD SURFACE. SHAKING THE PRINT CARTRIDGE DOES NOT “MIX”

THE INK AND HITTING THE CARTRIDGE AGAINST A HARD SURFACE DOES NOT

CLEAR THE NOZZLES BOTH OF THESE ACTIONS ACTUALLY HURT THE PRINT

QUALITY BECAUSE THEY ALLOW BUBBLES TO FORM NEAR THE INK FIRING

CHAMBERS. THESE BUBBLES PREVENT THE NOZZLES FROM FIRING CAUSING

WHITE STREAKS IN THE PRINT IMAGE.