Removal and Replacement Instructions for Paper Input Unit (PIU)

The following removal and replacement procedures for the Paper Input Unit (PIU) are found in the HP LaserJet 9000 Service Manual.

How to replace the Paper Input Unit (PIU)

Perform the following printer teardown instruction in the order listed. Reinstall in the reverse order.

Remove the right door

Figure 1: Removing Tray 1 (if installed)

1. Remove Tray 1 if there is one installed on the printer.

2. Open the right door.

3. Pinch and then push the two tabs on the end of the black strap to release the strap ends, see Figure 5, call-out 1. Needle nose pliers may be used if there is difficulty with this step.

4. Disconnect four locator tabs on the cable cover and remove the cover, see Figure 1, call-out 2.

Figure 2: Unplugging the two connectors

5. Unplug two multiple-wire cable connectors; see Figure 2, call-out 3.

6. Lift the right door up and off the two hinges and remove it from the printer.

CAUTION: Do not remove the single grounding cable shown in Figure 2, call-out 4.

Remove the back cover

Figure 3: Back cover removal

1. Remove two silver screws from the right back cover; see Figure 3, call-out 1.

2. Remove seven gold screws from the back cover; see Figure 3, call-out 2.

3. Remove the back cover and the right back cover together as one part.

Remove the right rails

Figure 4: Right rail removal

1. Remove Trays 2 and 3.

2. Remove two silver screws from the right rail cover; see Figure 4, call-out 1.

3. Lift the upper tab to release it, see Figure 4, call-out 2 and push the lower tab to the right to release it, see Figure 4, call-out 3.

4. Remove the right rail cover.

5. Repeat these steps to remove the left rail cover.

Remove the Paper Input Unit (PIU) from the printer

Figure 5: Rail removal

1. Remove four gold screws, two from each rail, see Figure 5, call-out 1.

2. Pull the rails out from the front of the printer.

Figure 6: PPCU removal

3. Face the right side of the printer.

4. If the 2000-sheet feeder (Tray 4) is installed, remove the Paper Path Connecting Unit (PPCU) by sliding two levers toward the center of the unit; see Figure 6, call-out 2.

Figure 7: Right lower cover removal

5. Remove three screws from the right lower cover; see Figure 7, call-out 3.

6. Rotate the lower edge up to release two tabs; see Figure 7, call-out 4.

7. Remove the right lower cover.

Figure 8: Back of the printer

8. Face the back of the printer.

9. Remove the J-220 and J-221 cable connectors from the DC Controller; see Figure 8, call-out 5.

10. Carefully unwind the cables from the cable guides, see Figure 8, call-out 6.

Figure 9: Right side of the printer

11. Face the right side of the printer.

12. Push the green registration handle down slightly and pull it out to get access to the PIU, see Figure 9, call-out 7.

13. Remove four silver screws; see Figure 9, call-out 8.

14. Grasp the PIU handle and lift the PIU out of the printer, see Figure 9, call-out 9.

WARNING: The PIU is heavy.

Figure 10: Reinstallation tip1 -Green handle in the UP position

Reinstallation Tips:

1. Verify that the green handle on the registration assembly is in an up position before reinstalling the PIU, see Figure 10, call-out 1.

2. Reinstall the right lower cover before the right rail cover.

© 2005 Hewlett-Packard