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HP Designjet 1000 Series Printers - TWI: Printhead Rejection Issues

Document number: BPP90175

Last updated: 29-Oct-2003

Minimum skill level: 2

The printer's Carriage does not accept one or more of the Printheads. Typical causes are dirty contacts on the Printheads or Carriage, defective Printhead(s), or a defective Carriage. Follow the steps listed below to determine the actual cause of the failure and to replace the appropriate parts.

Part description	Models - C6074A/B, C6075A/B
Carriage Assembly (Required)	C6074-60388 / C6074-69388
Trailing Cable (Required)	C6074-60418
Electronics Module Fuse (Required)	C6074-60467
Black Printhead/Cleaner (Optional)	C4820A
Cyan Printhead/Cleaner (Optional)	C4821A
Magenta Printhead/Cleaner (Optional)	C4822A
Yellow Printhead/Cleaner (Optional)	C4823A

NOTE: If the printer is installed on a Multi-Roll feeder accessory, some Multi-Roll disassembly may be required to gain access to the printer. Instructions for Multi-Roll disassembly are listed at the bottom of this document for reference.

NOTE: The fuse being sent should be used if a poor Trailing cable connection or a shorted Trailing cable blows the fuse on the Electronics module. Make sure to properly connect the Trailing cable or replace a shorted Trailing cable before installing the new fuse.

If any of the troubleshooting steps listed below solve the problem, attempt to verify printer functionality by printing several internal prints. If functionality is verified, no additional parts should be replaced.

NOTE: Prior to creating a service, ensure the affected printhead(s) have been replaced and ensure the printheads are under warranty. If the printhead(s) are under warranty and defective, send a replacement printhead and ink system return kit to the customer. If the affected printhead(s) are out of warranty, have the customer replace the printhead.

1. Turn the printer on.

2. Allow printer to complete initialization.

3. With the ink droplets icon highlighted, press Enter.

4. Select Replace Printheads and press Enter.

5. If the message, “Printheads still functional”,appears, scroll to Yes (Replace) and press Enter.

6. Open the top cover.

7. Open the carriage cover and remove all of the printheads.

8. Turn the printer off.

9. Clean the electrical contacts on the carriage and the printheads using a lint-free cloth dampened with water.

10. When the contacts are dry, reinstall the printheads and close the carriage cover.

11. Close the top cover.

12. Turn the printer on.

13. If the error returns, replace the affected printhead(s). Replace the printhead(s) prior to creating a service call; this will prevent sending on-site technicians to replace a printhead.

    NOTE: If the Printhead error icon is a question mark, each Printhead will have to be tested separately as the printer is not sure which one is causing the problem.

14. Following replacement of the suspect printhead(s), attempt to verify functionality.

15. If the problem persists, ensure the printer's firmware is version A.01.07 or greater. Upgrade the firmware if necessary.

    NOTE: The REPLACE message appears in the front panel when several nozzles of a printhead are failing. This condition is stored in the ACUMEN chip of the printhead, and in previous releases of the firmware code, once the printhead was marked as replace, the condition could not be reversed even if the printhead was successfully recovered. When using firmware A.01.07 or higher, the replace condition can be reversed by either reseating the printhead or by triggering a printhead recovery through the front panel.

16. If the problem persists, replace the carriage and trailing cable (refer to pages 8-44 to 8-52 of the Service Manual for instructions).

17. Following replacement, turn the printer on.

18. Make sure the printhead alignment completes successfully and that no error messages appear on the front panel.

19. Print a troubleshooting plot and ensure the print quality is acceptable.

    1. Select the printer icon and press Enter.

    2. Select Utilities and press Enter.

    3. Scroll down to Test Prints and press Enter.

    4. Scroll down to Print Quality and press Enter.

20. Verify that the printer has passed all three tests before leaving the customer’s site.

Only remove the corresponding side cover of the Multi-Roll that requires maintenance. For example, only remove the right side cover of Multi-Roll if only the right end cover of the printer requires removal to complete the necessary service. Follow the steps listed below to gain access to the printer to complete the necessary service.

NOTE: Only one CE needs to be dispatched to perform service on an HP Designjet 1000 series printer attached to a Multi-Roll feeder.

WARNING: Turn both the printer and the Multi-Roll feeder off and disconnect them from the power source prior to performing any maintenance.

1. Open the left door of the Multi-Roll feeder.

2. Loosen the two screws that secure the left door to the Multi-Roll feeder.

   Figure 1:Screws securing left door

   

3. Remove the left door.

   CAUTION: Be careful when removing the door not to break it.

4. Remove the two star screws (orange) that secure the front top-cover to the Multi-Roll feeder.

   Figure 2:Screws securing front top-cover

   

5. Remove the Multi-Roll feeder top cover.

6. Remove six T-20 screws that secure the left-side cover to the Multi-Roll feeder from the front.

   Figure 3:Screws securing the front left-side cover

   

7. Remove the seven T-20 screws that secure the left-side cover to the Multi-Roll feeder from the rear.

   Figure 4:Screws securing the rear left-side cover

   

8. Remove the left-side cover.

   Figure 5:Removing the left-side cover

   

WARNING: Turn both the printer and the Multi-Roll feeder off and disconnect them from the power source prior to performing any maintenance.

1. Remove the right door and front top cover from the Multi-Roll feeder (follow Steps 1 - 5 of the previous section and remove the right door instead of the left).

2. Remove six T-20 screws that secure the right-side cover to the Multi-Roll feeder from the front.

   Figure 6:Screws securing the front right-side cover

   

3. Remove nine T-20 screws that secure the right-side cover to the Multi-Roll feeder from the rear.

   Figure 7: Screws securing the rear right-side cover

   

4. Open the rear top cover.

   Figure 8:Rear top cover open

   

5. Release the cable that is attached to the top of the right-side cover.

   Figure 9:Cable connection

   

6. Remove the right-side cover.

   Figure 10:Removing the right-side cover

   

Follow the procedures listed above in reverse order.

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