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HP Designjet 750C Series Printers - Pen Rejection, Replace, Reseat Messages

	Introduction
	Required parts (part numbers are subject to change)
	Troubleshooting steps
	Drop Detect Calibration
	Line Sensor Calibration
	Accuracy Calibration
	Verifying functionality

Document number: BPP90012

Last updated: 24-Apr-2003

Minimum skill level: 2

Introduction

The printer's carriage does not accept one or more of the print cartridges. Typical causes are dirty contacts on cartridges or carriage, defective cartridge(s), or a defective carriage. Follow the steps listed in this document to accurately determine the cause of the failure and to replace the appropriate parts.

Required parts (part numbers are subject to change)

Part description	Models C3195A, C3196A
Ink Cartridges (Optional)	51645A, 51644C, 51644M, 51644Y
Trailing Cable (Required)	C3195-80009
Carriage Assembly (Required) - Order Refurbished Carriage if available, only send new Carriage if Refurbished Carriage is not available	C4708-69113 (Refurbished) C4708-60113 (New)

Troubleshooting steps

1. Troubleshoot the ink cartridges one at a time (with the other three removed). Reinstall all the cartridges (Access Cartridges key) and verify that each cartridge is accepted (steady filled-in box).
2. If any cartridges are rejected, press the Access Cartridges key on the front panel.
3. When ink cartridges are accessible, turn the printer off.
4. Prepare several lint-free cloths dampened with water. Be sure to wring out the lint-free cloth in order to remove excess water. Never drip water into the printer.
5. Remove the cartridge from the printer. Hold it by the cap and turn it upside down so that the nozzle plate of the print head is facing upward. Do not clean the nozzle plate.
6. Using the damp, lint-free cloth, clean the entire area along the electrical contact pads, especially where it bends down the backside of the print head. Wipe the contact pads very gently toward the cap end of the print head. Following this procedure will ensure that debris/contaminants are not wiped onto or toward the nozzle plate.

CAUTION: Do not attempt to clean the print nozzle area of the print heads. Clean only the electrical contacts on the print heads. Cleaning the print nozzle area may cause damage to print heads. Clogged print nozzles can also occur if the nozzle is wiped clean.

7. With the dampened lint-free cloth, clean the entire area along the carriage electrical contact pads.
8. Re-install the cartridges as described in step 1 above.
9. If problems persist, continue with the remaining steps.
10. Try a known good cartridge in the failing carriage slot to help determine if the problem lies with the carriage or the cartridge. All color cartridges can be substituted, however the black cartridge cannot be inserted into any other carriage slots.
11. Replace all ink cartridges that continue to fail.
12. If replacing the cartridges does not resolve the issue, continue with Step 5.
13. Tighten the X-axis gear if printer is failing printhead alignment.
14. Replace the carriage and trailing cable.
15. Perform the calibrations listed below.

Drop Detect Calibration

1. Switch the printer on.
2. Press the ENTER button.
3. Use the ARROW button to scroll to the Utilities menu display.
4. Press the ENTER button.
5. Simultaneously press the ENTER and the UP Arrow buttons to access the Service Tests submenu.
6. Use the ARROW button to scroll to 1C Drop Detect Cal and press ENTER.
7. The display shows the message Calibrating indicating the calibration is in progress. Press ENTER when the calibration is complete.
8. Stay in Service mode for the next calibration.

Line Sensor Calibration

1. In the Service Test submenu, scroll to 2C Line sensor cal and press ENTER.
2. The display will show Calibrating Green LED Light, indicating the calibration is in progress.
3. When the calibration is complete, the display will show Green LED Light # _ _ / press Enter. The number shown corresponds to the intensity of the LED light, which will vary for different types of media. The normal range of the number should be between 0 and 56.
4. Press ENTER when the calibration is complete and stay in Service mode.

Accuracy Calibration

1. Use a sheet approximately 24 x 36 inches, or roll media. To get the best results for an accuracy calibration, a polyester/matte film should be used.

NOTE: If a polyester or matte film is not available, use HP Coated media when performing an accuracy calibration.

2. Remove any media already loaded in the printer before performing the calibration.
3. In the Service Tests submenu, scroll to 3C Accuracy Cal and press ENTER.
4. Select Create when the Create pattern / Measure pattern message is displayed.
5. The Status / Calibrating message is displayed while the printer is calibrating.
6. When the printer has finished calibrating, the Load media for calibration message is displayed.
7. Load the media. If using D-size media, load the short edge as the leading edge in D-size printers and the long edge as the leading edge in E-size printers.
8. When the media is loaded, the printer will automatically begin to plot the pattern.
9. A Status / Printing message is displayed while printing.
10. Remove the media when prompted.
11. The Create pattern / Measure pattern message is displayed.
12. Press the DOWN Arrow button to select Measure Pattern.
13. Load the plot so the edge with the arrows point toward the printer, and reload the plot with the print side down.
14. Select Sheet Load by pressing the UP arrow.
15. The printer will load the plot and Status / Measuring will be displayed while the line sensor on the carriage measures the alignment marks.
16. If the calibration passes, the Calibration Done / Continue message is displayed.
17. Press the DOWN arrow to continue.
18. The Status / Ready for Media message will be displayed.
19. If the calibration is unsuccessful, tighten the X-axis gear.
20. Power cycle the printer to save calibration to the EEROM.

Verifying functionality

Power cycle the printer and print several internal plots "E" or "D" size.

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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