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HP Designjet CP Series Printers - Ink System Error 72-YYYY

In this document:

The printer has detected an error in the ink system. Printing will be disabled until the error has been corrected. If more than one error is pending, the one with the highest number, corresponding to the most severe error will be displayed (1000-Yellow, 0100-Cyan, 0010-Magenta, or 0001-Black). Example YYYY=0110: Cyan and Magenta. Use the steps listed in this document to accurately determine the cause of the failure and replace the appropriate parts.

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


Part Description

Models - C4703A, C4704A, C6085A

Models - C4723A, C4724A, C6084A

Ink System(s) (Optional) Send/Replace only failing ink system(s)

Black C1806A Dye C1892A UV Cyan C1807A Dye C1893A UV Magenta C1808A Dye C1894A UV Yellow C1809A Dye C1895A UV

Black C1806A Dye C1892A UV Cyan C1807A Dye C1893A UV Magenta C1808A Dye C1894A UV Yellow C1809A Dye C1895A UV

Refill Assembly (Required)

C4723-60249

C4723-60249

Adjustment Kit (Required)

C4723-60238

C4723-60238

Troubleshooting stepsback to table of contents

If parts are replaced or fixed in any of the steps listed below, attempt to verify printer functionality by turning the printer on and printing internal test prints. If functionality is verified, no additional parts should be replaced.

  1. The printer has detected that one or more of the ink valves have popped out during refilling, or the sensor is not functioning properly.
  2. Open the left cover.
  3. Check if any valve connectors have popped out, reseat if needed.
  4. Press the affected ink valve sensor in while watching the front panel display to change to a steady, solid square. If the square remains empty continue with Step 8. If the square does change to a solid, steady square continue with Step 5.
  5. Ensure the plastic tip has not been bent out of place (bend tip forward if needed).
  6. Attempt to reseat the valve connector.
  7. If the valve will not reseat, replace the problematic ink system.
  8. If problems persist, replace the Refill Assembly (refer to pg. 8-55 of the Service Manual).
  9. Following replacement, perform Service Calibrations C02, C05, and C07 (2500/3500 only).

Performing Service Calibrations or Service Diagnostic Testsback to table of contents

Following each calibration, turn the printer off to store the new calibration values in the EEROM. Turn the printer on (entering Service mode) and perform the next required calibration. Repeat this cycle until all necessary calibrations have been performed.

  1. Make sure the printer is turned off from the power switch on the back of the printer.
  2. Hold the Up Arrow key and the Enter key down while turning the printer on.
  1. Once the message "Status/Ready" is displayed on the front panel, press Enter.
  2. Use the Arrow keys to scroll to Utilities and press Enter.
  3. Scroll to Service Tests and press Enter.
  4. Scroll to Service Calibrations or Diagnostics and press Enter.
  5. Use the Arrow keys to scroll through the specific calibrations or Diagnostic Tests and press Enter when the required calibration/test is displayed.

Copyright Hewlett-Packard Co. 2001
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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