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HP Designjet 1000 Series Printers - TWI: Switch Power Off Check Printhead Path

	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Scan Axis test
	Multi-Roll feeder disassembly
	Removing the Multi-Roll feeder left-side cover
	Removing the Multi-Roll feeder right-side cover
	Installation of covers

Document number: BPP90070

Last updated: 17-Jan-2003

Minimum skill level: 2

The printhead Carriage cannot move, or has difficulty moving freely. Common causes are obstructions in the Carriage path, excess friction along the Carriage path, and worn or damaged Y-axis parts. Use the steps listed in this document to determine the cause of the failure and replace the appropriate parts.

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.

Parts required (part numbers are subject to change)

Part description	Models C6074A, C6075A, C6074B, C6075B
Scan-Axis Motor (Required)	C6074-60419
Trailing Cable (Required)	C6074-60418
Electronics Module Fuse (Required)	C6074-60467
Carriage Belt (Required)	C6072-60198
Lubrication Oil (Required)	C6071-60177
Encoder Strip (Required)	C6072-60197

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.

NOTE: If the carriage stops on left-hand side (roughly 12 inches from the ink supply station), unplug the power cable from the printer, open the top cover and try to move the carriage to the right. Closely inspect the ink tubes for wear, and check for ink tube binding or catching on the tube guide (stopping/hindering carriage movement). If the issue appears to be caused by the ink tube system, refer to bpp90220 - Ink Tube System Causing Switch Power Off Check Printhead Path Messages.

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.

1. Turn the printer off, using the power switch on the back of the printer.
2. Unload media and check for obstructions in the Carriage path.
3. Check for jammed media. If there is a jam, follow the steps directly below. If there are no jams, continue with Step 4.
1. Slide the cartridge Carriage out of the way toward either side of the enclosed ends of the printer (if needed).
2. Lift the ARSS release lever.
3. Remove any of the jammed media that is easily lifted up and out from the top of the printer.
4. Pull the rest of the roll or sheet down and out of the entry slot where the media is loaded.
5. Check around the ends, front, and rear edges of the platen roller to verify that all of the torn media is removed. A manila folder can be used to remove jammed media from the media path (take care not to damage the media sensor on the right side of the printer).
6. Lower the printer window and the ARSS lever and turn the printer on. After initialization, press the Form Feed And Cut key to eject any pieces of media that might still be in the media path.
7. Reload the media as normal. If using roll, trim the edge so the media is straight before loading. Also, be sure not to load the media upside down.
8. If loading is successful, repeat loading procedure with both roll and sheet media (preferably larger than 8 1/2 x 11 inches) two times each, to prove functionality. If everything works well, no parts need to be replaced.
9. If loading is unsuccessful or problems persist, continue with Step 4.
4. Clean the Carriage slider rods and apply oil along the complete axis of the slider rods.
5. Gently clean the encoder strip with a lint-free cloth dampened with water. Replace the encoder strip if it is visibly damaged (refer to pages 8-34 of the Service Manual).

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

6. Trip the window sensor using a pen cap or small piece of media.
7. Turn the printer on.
8. Watch the Carriage movement during initialization. Make sure the cables attached to the Carriage assembly do not obstruct the Carriage movement anywhere along the entire Carriage path. Fix as necessary and attempt to verify functionality.
9. If the error states "Switch Power Off, Check Printhead Path (1)" and the Carriage stops all the way to the left, above the cartridges, perform the steps directly below. If this is not the case continue with the next section (Scan Axis test).
1. Remove the left cover.
2. Remove the cutter actuator arm from the tensioner assembly.
3. Re-install the tubes and cartridges.
4. Turn the printer on and run a test print.
5. If the error appears, continue with the next section (Scan Axis test).
6. If the error does not appear, turn the printer off, then on and run another test print.
7. If problems persist, continue with the next section (Scan Axis test).

Scan Axis test

1. Turn the printer off using the Power switch on the front of the printer.
2. Hold down the Color key and turn the printer on.

NOTE: Wait until the message, "Initializing" appears, and then release the Color key.

3. Once inside the Service Tests menu, scroll to 5 Scan Axis, and press Enter.
4. Allow the printer to complete the test.
5. When finished, SCAN AXIS BACKWARDS values will display on the front panel. Note all five values and press Enter.
6. The SCAN AXIS FORWARD values will now appear. Again, note the five values.
7. Use the table below to determine if the values are within the printer limits:

	Scan-Axis Forward		Scan-Axis Backwards
	Normal	Maximum	Normal	Maximum
Avg. PWM	165	185	-165	-185
Max. PWM	220	240	220	240
Stabilize Dist.	1800	2400	1800	2400
Avg. Speed offset	2.4	10	2.4	10
STD Speed offset	4.4	10	4.4	10

8. If the values obtained are less than the maximum listed in the table, the test has passed. Turn the printer off then on, and again try to verify functionality.
9. If the values are greater than the maximum allowed, oil the slider rods and repeat the Scan Axis test.
10. If the test passes, turn the printer off then on, and try to verify functionality.
11. If the values are still out of range, replace the Scan-Axis motor (refer to pages 8-33 of the Service Manual).
12. Following motor replacement, perform the Scan-Axis test again.
13. If the values are within the limits, turn the printer off then on, and try to verify functionality.
14. If the values continue to stay out of range following motor replacement, replace the trailing cable and carriage belt (refer to pages 8-44 and 8-39 of the Service Manual).
15. After replacement, perform the following calibrations:
1. Line Sensor
2. Service Station
3. Roller Mark Position
4. Color to Color
5. Pen Alignment
16. Following successful calibrations, attempt to verify functionality.
17. If problems persist, continue with the remaining steps.

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 an HP Designjet 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.

1. Open the left door of the Multi-Roll feeder.
2. Loosen the two (2) screws that secure the left door to the Multi-Roll feeder.

Figure 1: Screws needing removed

3. Remove the left door.

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

4. Remove the two (2) star screws (Orange) that secure the front-top cover to the Multi-Roll feeder.

Figure 2: Two (2) star screws needing removed

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

Figure 3: Six (6) screws needing removed

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

Figure 4: Seven (7) screws needing removed

8. 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.

1. 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).
2. Remove six (6) T-20 screws that secure the right-side cover to the Multi-Roll feeder from the front.

Figure 6: Six (6) screws needing removed

3. Remove nine (9) T-20 screws that secure the right-side cover to the Multi-Roll feeder from the rear.

Figure 7: Nine (9) screws needing removed

4. Open the rear-top cover.

Figure 8: Rear-top cover

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

Figure 9: Cable needing released

6. Remove the right-side cover.

Figure 10: Removing the right-side cover

Installation of covers

Follow the procedures listed above in reverse order.

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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