HP Designjet 1000 Series Printers - TWI: System Error 0B0006

Part Description	Models - C6074A, C6075A	Models - C6074B, C6075B
Trailing Cable (Required)	C6074-60418	C6074-60418
Carriage Assembly (Required)	C6074-60388	C6074-60388
Electronics Module (Required)	C6072-69146	C6074-60283
Electronics Module Fuse (Required)	C6074-60467	C6074-60467

NOTE: If the printer is installed on a multi-roll feeder accessory, some multi-roll disassembly is 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.

Troubleshooting steps

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: If the printer has had service recently or the printer is new, continue with Steps 1-11 directly below. If no service has been performed and printer was working normally before the error occurred, continue with the section Steps for printer working normally prior to error listed below.

Steps for new or recently serviced printer

Turn the printer off, then on, to verify the error (if no error, attempt to verify functionality).

If the error appears, turn the printer off and disconnect the power cable from the printer.

Disconnect the Trailing cable (refer to pg. 8-39 of the Service Manual).

Check that the ends of the cable are flat and not damaged or bent. Replace if damaged (refer to pg. 8-39 of the Service Manual).

NOTE: If Removal and Installation instructions are needed for reference during any repairs performed, refer to the 1000 Series Service Manual available on the Computer Care Web site for review or download.

Reconnect the Trailing cable correctly, making sure it is pushed in firmly (shaded part will NOT be visible).

Before turning the printer on, check the resistance (ohms) between the two test points above the Trailing cable.

If the resistance is less than 100 ohms, do NOT turn the printer on as the Trailing cable is installed incorrectly or is damaged. Remove and reinstall the cable again and measure the resistance. If the resistance is still less than 100 ohms, replace the Carriage and Trailing cable. If the fuse (if present) is blown, replace the fuse. Following replacement, turn the printer on and perform a Calibrations Backup and a Pen Alignment Calibration as listed below (Perform a Carriage Height Calibration per instructions shipped with Carriage Height tool). Verify printer functionality.

If the resistance is greater than 100 ohms, change the fuse (if present), turn the printer on and verify functionality.

If the error continues after reinstallation of the Trailing cable and replacement of the fuse (if applicable), then replace the Electronics module and Trailing cable (if not already replaced). Refer to pgs. 8-25, 8-39 of the Service Manual.

Following replacement of the Electronics module, turn the printer on and perform a Calibrations Backup and a Pen Alignment Calibration as listed below.

Steps for printer working normally prior to error

Turn the printer off, then on, to verify the error (if no error, attempt to verify functionality).
If the error appears, turn the printer off and disconnect the power cable from the printer.
Access the Electronics module (remove the small cover on left side) and visually inspect the fuse located on the upper left corner of the Electronics module (newer Electronics modules). If no fuse, continue with Step 6.
If fuse is burned, replace the Carriage, Trailing cable and fuse. Refer to pgs 8-44, 8-39, and 8-25 of the Service Manual.
Following replacement, turn the printer on and perform a Calibrations Backup and a Pen Alignment Calibration as listed below (Perform a Carriage Height Calibration per instructions shipped with Carriage Height tool). Verify printer functionality.
If no fuse is found on the Electronics module (older Electronics module), check F7 on the upper right corner of the Electronics module.
Use an Ohmmeter to check F7.
If the value is above 1 ohm, the fuse is blown. Replace the Carriage, Trailing cable and Electronics module (refer to pgs. 8-44, 8-39, and 8-25 of the Service Manual).
Following replacement, turn the printer on and perform a Calibrations Backup, and a Pen Alignment Calibration as listed below (Perform a Carriage Height Calibration per instructions shipped with Carriage Height tool).
If the fuse is NOT blown (value less than 1 ohm), replace the Carriage and Trailing cable (refer to pgs. 8-44, and 8-39 of the Service Manual).
Following replacement, turn the printer on and perform a Carriage Height Calibration per instructions shipped with Carriage Height tool).
Verify printer functionality.

Calibrations Backup

NOTE: Printer menu mode must be set to Full to access the Service Tests submenu. To verify, at the Ready prompt, scroll to the PRINTER SETUP icon, and press Enter. Use the Arrow keys to scroll to the Utilities menu and press Enter. Using the Arrow keys scroll to Menu Mode =. Select Full (if needed) and press the Back key to return to the main menu.

With the printer turned on, scroll to the Printer Setup Menu (Icon of printer in lower right side of the front panel display) and press Enter.
Scroll to Utilities, and press Enter.
Simultaneously press the Up Arrow key and the Enter key.
Using the Arrow keys, scroll to Service Calibrations and press Enter.
Scroll to 7 Calibrations Backup and press Enter.
Select Electronics Module Repl, and press Enter.
Select Accept to continue the Calibrations Backup.
Press Enter when Calibrations Backup is complete.
Following the calibration, turn the printer off then on and verify functionality.

Pen Alignment

In the Service Tools submenu scroll to the 8. Pen Alignment and press Enter.
Scroll to Accept and press Enter.
If paper is not loaded, the printer will prompt for installation of paper; load as needed.
The printer will begin the Pen Alignment and display the time remaining to complete the calibration.
When the calibration is complete press Enter to continue.
Following the calibration, turn the printer off, then on and verify functionality.

Multi-roll feeder disassembly

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 a 1000 series printer attached to a multi-roll feeder.

Removing the multi-roll feeder 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.

Open the left door of the multi-roll feeder.
Loosen the two screws that secure the left door to the multi-roll feeder.
Figure 1:Left door screws
Remove the left door.
Remove the two star screws (Orange) that secure the front top-cover to the multi-roll feeder.
Figure 2:Front top-cover screws
Remove the multi-roll feeder top cover.
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
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
Remove the left side cover.
Figure 5:Removing the left side cover

Removing the multi-roll feeder right 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.

Remove the right door and front top cover from the multi-roll feeder (follow steps 1 through 5 of the previous section and remove the right door instead of the left).
Remove Six T-20 screws that secure the right side cover to the multi-roll feeder from the front.
Figure 6:Screws securing front right-side panel
Remove nine T-20 screws that secure the right side cover to the multi-roll feeder from the rear.
Figure 7:Screws securing rear right-side cover
Open the rear top cover.
Figure 8:Rear Top cover
Release the cable that is attached to the top of the right side cover.
Figure 9:Cable connection
Remove the right side cover.
Figure 10:Removing the right side cover

Installation of covers

Follow the procedures listed above in reverse order.

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	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Calibrations Backup
	Pen Alignment
	Multi-roll feeder disassembly
	Removing the multi-roll feeder left side cover
	Removing the multi-roll feeder right side cover
	Installation of covers