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HP Designjet 750C, 750C Plus and 755CM Series Printers - Vertical Line Straightness

In this document:

Vertical Line Straightness (VLS) issues can be caused by several factors. The most common causes of VLS are dirty or defective cartridges, dirty or damaged encoder strip, worn belt, or a faulty Carriage or Trailing cable. This document provides instructions to quickly ascertain the cause and the parts necessary to solve the issue.

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


Part description

Models - C3195A, C4708A, C4708B

Models - C3196A, C4709A/B, C3198A/B

Carriage Assembly (Required)

C4708-60113

C4708-60113

Carriage Belt (Required)

C4705-60082

C4706-60082

Trailing Cable (Required)

C3195-80009

C3195-80009

Lubricant (Required)

6040-0854

6040-0854

Encoder Strip (Required)

C4713-60098

C4714-60098

Ink Cartridge (Optional)

(1) 51645A

(1) 51645A

Troubleshoot the ink cartridgesback to table of contents

  1. Remove the ink cartridges, and clean the electrical contacts on the carriage and cartridges. Use a lint-free cloth dampened with water.
  2. If cleaning the contacts does not resolve the issue, replace the ink cartridges.
  3. If replacing cartridges is no help, continue with the remaining steps.

Clean/replace the encoder strip, and lubricate the carriage railsback to table of contents

  1. Slide the carriage all the way to the left or right side of the printer.
  2. Using a lint-free cloth dampened with water, clean the encoder strip. If the encoder strip is damaged, replace as needed.
  3. Inspect the carriage belt for excessive wear or damage, and replace if needed.
  4. Lubricate the carriage rails.
  5. If problems persist, continue by replacing the carriage and trailing cable.

Replace the carriage and trailing cableback to table of contents

  1. Replace the carriage and trailing cable.
  2. Perform the calibrations in the order listed below.

Drop Detect calibrationback to table of contents

  1. Turn the printer on.
  2. Press ENTER.
  3. Using the Arrow key, scroll to Utilities and press ENTER.
  4. Simultaneously press the ENTER and the Up Arrow keys to access the Service Tests submenu.
  5. Scroll to 1C Drop Detect Cal, and press ENTER.
  6. The printer will display the message Calibrating, indicating that the calibration is in progress.
  7. Press ENTER when the calibration is complete.
  8. Stay in Service mode to perform the next calibration.

Line Sensor calibrationback to table of contents

  1. In the Service test submenu, scroll to 2C Line sensor cal, and press ENTER.
  2. The printer will display the message Calibrating Green LED Light, indicating that calibration is in progress.
  3. When the calibration is complete, the printer will display 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.
  5. Stay in Service mode to perform the next calibration.

Accuracy calibrationback to table of contents

  1. Place a sheet of polyester film over the top of the printer for approximately 10 minutes to let it stabilize to the environmental conditions. Use a sheet of approximately D-size (61 x 91 cm, 24 x 36 inches). Roll media may also be used. When using polyester film, load it with the matte (dull) side down.
  1. Remove all media already loaded in the printer before performing the calibration.
  2. In the Service Tests submenu, scroll to 3C Accuracy Cal, and press ENTER.
  3. The message Create pattern/measure pattern, appears.
  4. Press the Up Arrow key to select Create pattern.
  5. The message Status/Calibrating, appears while the printer is calibrating.
  6. When the printer is finished calibrating, the message Load media for calibration appears.
  7. Load the media. If using D-size media (HP part, 51642A), load the short edge as the leading edge in D-size printers and the long edge as the leading edge in E-size printers (E-size media, HP part, 51642B).
  8. When the media is loaded, the printer will automatically begin to plot the pattern.
  9. The message Status/Printing appears while printing.
  10. Remove the media when the printer is finished printing.
  11. The message Create pattern/Measure pattern appears.
  12. Press the Down Arrow key to select Measure Pattern.
  13. Rotate the plot so the edge with the arrows point toward the printer, and reload the plot with the arrow edge print-side down.
  14. The printer will load the plot and measure the alignment marks using the line sensor on the Carriage.
  15. If the calibration passes, the message Success Calibration/Press Enter appears.
  16. Press the PREVIOUS key until Ready is displayed on the printer's front panel.
  17. Turn off and turn on the printer to verify functionality.

Verify functionalityback to table of contents

Print several internal plots, E or D size.

Copyright (C) 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.
in connection with the use of this material.

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