The following printhead has a problem black yellow k y

Inderpal Singh

• 183 Answers
• Posted on Aug 19, 2008

SOURCE: the following printheads has a problem

Resetting the All-in-One

• Press the On () button to turn off the unit.
• Disconnect the power cord from the back of the unit.
• Connect the power cord to the back of the unit.
• Press the On () button to turn on the unit.

odiegh

• 81 Answers
• Posted on Dec 01, 2008

SOURCE: printhead problem (black/yellow) on HP L7780

When you removed the paper it's possible your damaged it and that's why the message is not going away. Did you try to put the cartridge back in to make sure it had not come out of position and just remove the power cord for a minute then plugging it back it.

Here are the steps to make sure you properly change the cartridges and the heads...

Install the ink cartridges and printheads Step one: Install the ink cartridges All four ink cartridges must be correctly installed for the HP All-in-One to work. Follow the steps below to Install cartridges:

1. Open the ink cartridge cover.
2. Remove each ink cartridge from its package.
3. Align each ink cartridge with its color-coded slot and then insert the ink cartridge into the slot. To ensure proper contact, press down firmly on the cartridges until they snap into place.
4. Close the ink cartridge cover.

1. Open the top cover of the printer. Figure 2: Open the top cover
2. If the carriage does not move to the left automatically, press and hold the Resume button ( ) for three seconds. Wait for the carriage to stop moving.
3. Remove the cardboard cover from the printhead carriage. Figure 3: Remove the cardboard cover
4. Lift the printhead latch. Figure 4: Lift the printhead latch
5. Before installing a printhead, shake the printhead up and down at least six times while the printhead is still in its packaging. Figure 5: Shake the printhead while it is still in its packaging
6. Remove the new printhead from its package, and then remove its orange protective caps. CAUTION: Do not shake printheads after the caps are removed. Figure 6: Remove the printhead from its packaging, then remove the orange caps from the printhead
7. Insert the printhead into its color-coded slot. The label on the printhead must match the label on the printhead latch. Press down firmly on the printhead to ensure proper contact. Figure 7: Insert the printheads in the correct color-coded slots
8. Pull the printhead latch all the way forward, and then press down to ensure that the latch is properly engaged. You might have to apply some pressure to engage the latch. Figure 8: Close the latch
9. Close the top cover. Figure 9: Close the top cover

1. Press the Setup button on the control panel Setup and the number 6 on the keypad or scroll to Tools .
2. Press 4 on the keypad or scroll to Align Printer . The alignment process starts.

SOURCE: Printhead Problem:

Have you tried to replace the black/yellow printhead? This is not the same as the ink cartridges, but it is located in the compartment under and to the right of the scanner lid.
Here is HP's link.
It looks like this...