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HP Designjet CP Series Printers - Printhead Rejection Issues

	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Performing Service Calibrations

Document number: BPP90110

Last updated: 14-Jan-2003

Minimum skill level: 2

The carriage is not accepting one or more printheads. This may be due to dirty or worn contacts, a poorly seated printhead, a bad printhead or damaged carriage. 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)

Part Description	Models - C4703A, C4704A, C6085A	Models - C4723A, C4724A, C6084A
Ink Systems (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
Carriage Kit (Required)	C4723-60096	C4723-60096
Trailing Cable (Required)	C4704-60015	C4723-60237

NOTE: If Removal and Installation instructions are needed for reference during any repairs performed, refer to the CP Series Service Manual available on the Computer Care Web site for review or download.

Troubleshooting steps

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

1. Press the Replace Ink System key to move the carriage so printheads can be accessed, if not already accessible.
2. Open the top cover.
3. Remove and reseat the suspect printhead(s). Try twice, as contacts might be worn.
4. A flashing square or square outline will indicate the printhead. If the printhead is good, the square will change to an hourglass, and then a steady square.
5. If unsuccessful, remove all printheads.
6. Using a lint free cloth dampened with water, clean all the contacts in each carriage slot and on all printheads. This will remove any dirt or ink that may be preventing a good connection.
7. Reinstall one printhead at a time and watch the front panel display for the corresponding square to change to a steady square indication. Remove each printhead before inserting another into the carriage.
8. Continue testing the remaining printheads, with one printhead in the carriage at a time.
9. If any printheads fail, break the keyed tabs just below the label on front of printhead and insert it into one of the other known good slots.

CAUTION: When swapping printheads from the original slot to another, never close the top cover window. The printer may immediately refill and contaminate the printhead(s).

10. If printhead still shows bad in second slot, replace the ink system and attempt to verify functionality.
11. If the printhead shows good in the second carriage slot or replacing the ink system was no help, replace the carriage and trailing cable (refer to pg. 8-42, 8-36 of the Service Manual).
12. Perform Calibrations C01, C02, C03, C05, C06, C07 (2500/3500 only), and C08 (instructions listed below).
13. Following calibrations, verify functionality.

Performing Service Calibrations

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.

NOTE: Continue to press both the Up Arrow key and the Enter keys until letters begin to scroll on the lower right corner of the front-panel display.

3. Once the message "Status/Ready" is displayed on the front panel, press Enter.
4. Use the Arrow keys to scroll to Utilities and press Enter.
5. Scroll to Service Tests and press Enter.
6. Scroll to Service Calibrations and press Enter.
7. Use the Arrow keys to scroll through the specific calibrations and press Enter when the required calibration is displayed.

NOTE: For the best results when performing the Accuracy calibration, use a Polyester Matte film. If Polyester Matte film is not available, use HP High Gloss or Heavy Coated media.

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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