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HP Designjet CP Series Printers - Ink System Error 88-YYYY

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

Document number: BPP90104

Last updated: 14-Jan-2003

Minimum skill level: 2

The printer has detected mixed ink system components or there is an electrical contact issue. The printhead(s), indicated by flashing squares, have failed to function because of an unusual electrical signal from the printhead. The most likely cause of this message is that the electrical contacts on the printhead or printer carriage are dirty and in need of cleaning or may be worn. The error data is as follows: 1000-Yellow, 0100-Cyan, 0010-Magenta, or 0001-Black (example YYYY=0110: Cyan & 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)

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
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 printing internal test prints. If functionality is verified, no additional parts should be replaced.

1. Check all printheads, cleaners, and cartridges to ensure that all components are dye based inks or UV inks.
2. Remove and reseat all four ink systems components. Try twice, as contacts might be worn. A flashing square or square outline will indicate the printhead. Square should change to an hourglass and a steady square, if good.
3. If unsuccessful, remove all printheads.
4. Clean all the contacts on the carriage and printheads using a lint free cloth dampened with water. This will remove any dirt or ink that may be preventing a good connection.
5. Reinstall one printhead at a time and watch front panel display for the corresponding square to change to a steady square indication. Remove this printhead before inserting another into the carriage. Continue testing the remaining printheads (only one printhead in the carriage at a time).

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).

6. If any printhead fails, try breaking the keyed tabs just below label on front of printhead and insert it into one of the other known good carriage slots.
7. If printhead still shows bad in the second slot, replace the failing ink system and attempt to verify functionality.
8. If the suspect printhead is accepted in another slot or problems persist following ink system replacement, replace the carriage and trailing cable (refer to pg. 8-42, 8-36 of the Service Manual).
9. Perform Calibrations C01, C02, C03, C05, C06, C07 (HP Designjet 2500/3500 only), and C08. Calibration instructions are listed below.

NOTE: It may be necessary to power the printer off with all four ink systems' components removed. For an unknown reason, the printer might not recognize replacement of a component. Leave the printer off for 30 seconds, turn the printer back on and wait until prompted to re-install any components.

Performing Service Calibrations or Service Diagnostic Tests

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 or Diagnostics and press Enter.
7. Use the Arrow keys to scroll through the specific calibrations or Diagnostic tests and press Enter when the required calibration/test 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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