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HP Designjet ColorPro Printers - Diagnosing a Faulty Printhead

In this document:

The Attention LED is flashing and the LCD displays X PRNT-HD FAULTY, REPLACE. Verify that the indicated printhead is faulty by following each of the steps in the Troubleshooting section below.

Parts required (part numbers are subject to change)back to table of contents

Part Description

Colorpro CAD

Colorpro GA

Whole Unit (Required)

C7777-69143

C7778-69143

Ink Cartridges (Optional)

Black (C4844A), Cyan (C4841A), Magenta (C4843A), Yellow (C4842A)

Black (C4844A), Cyan (C4841A), Magenta (C4843A), Yellow (C4842A)

Printheads (Optional)

Black (C4800A), Cyan (C4801A), Magenta (C4802A), Yellow (C4803A)

Black (C4800A), Cyan (C4801A), Magenta (C4802A), Yellow (C4803A)

Troubleshootingback to table of contents

  1. Ensure that the printer is turned on.
  2. Open the Printhead Access cover and unlock the printhead latch.
  3. Remove all four printheads, close the printhead latch, and then close the Printhead Access cover. The LCD panel will display: PRNT-HD DIAG PRESS <|> (Go button).
  4. Press the GO button. The LCD panel will then display the message: OPEN PRNT-HD ACCESS DOOR. Open the Printhead Access cover and unlock the printhead latch.
  5. The LCD will display REMOVE C, M, Y, CLOSE COVER. Insert the black printhead. Close the printhead latch, and then close the Printhead Access cover.
  6. The LCD will display DETECTING as it checks the printhead. After the printhead is tested, the printer will report either PRNT-HD FAULTY or PRNT-HD OK. Depending on the message displayed, proceed as follows.
    1. Press the GO button; the LCD will display REPLACE X PRNTHD CLOSE COVER.
    2. Open the Printhead Access cover and unlock the printhead latch.
    3. Remove the defective printhead and clean the copper contacts on the back of the printhead and the contacts in the carriage assembly.
    4. Replace the printhead after cleaning the contacts.
    5. Repeat Step 6 in the Troubleshooting section above.
    6. If the message X PRNT-HD FAULTY, PRESS <|> appears again, the printhead is faulty.
    7. Replace the defective printhead with a new printhead.
    8. Fasten the printhead latch and close the Printhead Access cover and repeat Step 6 in the Troubleshooting section above to verify the new printhead is working.
    9. If printhead errors continue, replace all four printheads simultaneously.
    10. Repeat Step 6 in the Troubleshooting section above to verify that the new printheads are working properly.
    1. Press the GO button; the LCD will display OPEN PRNTHD ACCESS COVER.
    2. Open the Printhead Access cover and unlock the printhead latch.
    3. Insert the next printhead (cyan) and fasten the printhead latch.
    4. Close the Printhead Access cover and repeat Step 6 in the Troubleshooting section.
    5. Repeat Step 6 in the Troubleshooting section for the Magenta and Yellow printheads to verify that all the printheads are working.
    6. The printer will display a READY message and the printhead detecting sequence will end once all of the printheads have been found to be in good working order.

Specific printhead errorsback to table of contents

  1. If a specific printhead error message is displayed after replacing a cartridge, there is a possibility that the cartridge can be causing the printhead error message.
  2. Remove the ink cartridge matching the color of the printhead generating the error.
  3. Turn the printer off and then on.
  4. Examine the message on the LCD panel.
    1. If the message {COLOR} PRNT-HD DEFECTIVE, REPLACE appears while initializing, the printhead is most likely defective; replace the printhead.
    2. If the message {COLOR} CART MISSING, INSERT appears in the LCD panel, insert the missing ink cartridge.
  5. If the printhead error returns after the ink cartridge is installed, the error is most likely due to a faulty ink cartridge; replace the ink cartridge.
  6. If the printhead error does not reappear shortly after inserting the ink cartridge, try printing for a while and see if the error returns.
  7. If the printhead error returns, try replacing the ink cartridge first and then the printhead.

Replace the whole unitback to table of contents

If the issue is not resolved after following the above troubleshooting steps replace the whole unit. See the Whole Unit Replacement instructions, which are included with the whole unit replacement.

Copyright (C) Hewlett-Packard Co. 2000
This information is subject to change without notice and
is provided "as is" with no warranty.
Hewlett-Packard shall not be liable for any direct,
indirect, special, incidental or consequential damages
in connection with the use of this material.

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