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HP Designjet 1000 Series Printers - TWI: Paper/Media Skew

Document number: BPP90153

Last Updated: 24-Feb-2003

Minimum skill level: 2

NOTE: Ensure the correct media related technical work instruction (TWI) is being applied to the issue. If media loading problems are occurring, use the Paper/Media will not Load TWI (bpp90155). If excessive noise during media advance is evident, use the Noise During Media Advance TWI (bpp90127).

Media skewing issues can be attributed to several causes. The most common causes of media skew are a dirty drive roller and/or overdrive rollers, problems with the spindle, or a faulty vacuum fan. Other causes may include the media itself (for example, unsupported media), or a faulty Overdrive assembly. Follow the steps listed below to determine the actual cause of the failure and to replace the appropriate parts.

Part Description	Models - C6074A, C6075A	Models - C6074B, C6075B
Spindle (Required)	C6072-60126	C6072-60126
Vacuum Fan (Required)	C6072-60159	C6072-60159
Center Platen (Required) includes Overdrive Assembly	C6072-60161	C6072-60161
Synthetic Oil (Required)	6040-0855	6040-0855

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.

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. Remove any media that may be loaded.

2. Access the Service Utilities menu as described below:

   1. Highlight the printer setup icon on the printer's front panel (Icon of printer in lower right corner of the display) and press Enter.

   2. Using the Arrow keys, scroll to Utilities and press Enter.

   3. Simultaneously press the Up Arrow key and the Enter key (gains access to the Service tools menu).

   4. Scroll to Service Utilities and press Enter.

   5. Scroll to #5 Overdrive Cleaning and press Enter.

   6. Use the Up or Down Arrow keys to control the speed of the rollers.

3. Open the Top cover.

   NOTE: With certain firmware versions the printer's sensors are not disabled when entering the Service tools menu. If the sensor is not automatically disabled, disable by inserting a folded piece of media into the top cover sensor (triggering the Top cover sensor).

4. Using a lint-free cloth dampened with water, clean the surface of the Drive roller, Pinch-arm rollers, and Overdrive rollers. While cleaning the pinch-arm rollers, ensure the pinch rollers are seated firmly against the Drive roller. If any of the pinch-arms are raised, replace the associated parts.

5. Repeat until Drive roller, Pinch-arm rollers and the Overdrive rollers are clean.

6. Allow the rollers to dry.

7. Close the top cover and try loading media.

   NOTE: Remove the folded media triggering the top cover sensor, if present.
8. If loading is successful, verify functionality.
9. If loading is unsuccessful, or problems persist, continue with the remaining steps.

1. Ensure that media is loaded on spindle correctly and ensure the spindle is seated properly into the rollfeed assemblies. Reseat and verify functionality if necessary. If spindle is seated properly continue with remaining steps.

   NOTE: Ensure the customer is using a supported media type for the printer. Media with specifications out of the printer’s range may affect media handling.

2. Remove the spindle from the printer.

3. Check right and left ends of the spindle for damage to machined ends. Replace the spindle if necessary.

4. Verify the spindle does not have the small end-caps, or the end-caps are not damaged. Replace the spindle if needed.

5. If the spindle is replaced, load media onto new spindle, and try re-loading.

6. If loading is successful, verify functionality.

7. If loading media is unsuccessful, or no problem is found with the spindle, continue with the remaining steps.

1. Open the printer's Top cover.

2. Remove media.

3. Check Overdrive Rollers to ensure that they are not swollen. If rollers are swollen, Overdrive (Center Platen assembly) must be replaced (refer to pg. 8-63 of the Service Manual). Lube Overdrive bushing with Synthetic Oil. Following Center platen replacement, perform a Service Station, Color to Color and Carriage Height Calibration (instructions listed below).

4. If problems persist or no problem was found, continue with the next section.

1. Open the printers top cover and load a sheet of media.

2. If the sheet loads correctly, attempt to verify functionality.

3. If problems occur, run the Electronics Systems service test:

   1. Turn the printer off for 15 seconds.

   2. Press and hold Color key, while turning the printer on.

   3. Continue holding Color key until the front panel displays Initializing, then release it.

   4. The front panel will display Service Tests.

   5. Select #1 Electronics System and press Enter.

4. If the test passes, do not replace the Vacuum fan. Attempt to verify functionality.

5. If the Vacuum fan fails, replace the fan (refer to pg. 8-11 of the Service Manual).

   NOTE: If there is not enough vacuum holding the sheet or roll flat onto the center platen, there may be an obstruction in the vacuum path, or the vacuum motor fan may be weak. Inspect the center platen for obstructions and replace the Vacuum fan if needed.

6. Following replacement, turn the printer off then on, and verify printer functionality.

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 Utilities 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.

1. At the Ready prompt, scroll to the Printer Setup icon and press Enter.

2. Using the Arrow keys, scroll to Utilities, and press Enter.

3. Press the Up Arrow key and the Enter key simultaneously (accessing the Service Tools menu).

4. Scroll to Service Calibrations and press Enter.

5. Scroll to the needed Service Calibration and press Enter.

6. Follow instructions displayed on the front-panel to complete the selected calibration.

7. When calibration is finished, stay in Service mode to perform any additional calibrations (if required).

8. When all required calibrations are complete, return to the main Status display using the Back key.

9. Turn the printer off.

10. Turn the printer on, and attempt to verify functionality.

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.

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:Left door screws

   

3. Remove the left door.

   CAUTION: Be careful to not break the door upon removal.

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

   Figure 2:Front top cover screws

   
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:Front left side cover screws

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

   Figure 4:Rear left side cover screws

   
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 through 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:Front right side cover screws

   

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

   Figure 7:Rear Right side cover screws

   
4. Open the Rear Top cover.

   Figure 8:Opening Rear Top cover

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

   Figure 9:Releasing right-side cover cable

   

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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