HP Color LaserJet 4600, 4610n, and 4650 Series Printers - Magenta Toner on Back of Pages In this document:

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1 HP Channel Services Network Page 1 of 6 HP Color LaserJet 4600, 4610n, and 4650 Series Printers - Magenta Toner on Back of Pages In this document: Introduction Contact center agents (troubleshooting to be performed with customer) Broken Cam on Alienation bars Damaged print cartridges Tools required Repair and replacement instructions Document #: c Last updated: October 12, 2005 part number for alienation bars: Q Minimum skill level: 2 Introduction Magenta toner is on the back of the pages and there may be excessive toner on the ETB. The defect will sometimes manifest itself as horizontal repetative defects. The cause of the defect is either broken, cracked, or improperly seated alienation bars. NOTE: This issue is not to be confused with the tray 1 any/any (toner purge issue).

2 Page 2 of 6 The alienation bar(s) is not seated properly Damaged print cartridges Print cartridges are not seated firmly into the cartridge slot Orange tape has not been removed from the print cartridges Mylar on toner shutter is stuck Contact center agents (troubleshooting to be performed with customer) Ensure the DC is 6d or higher and that the customer has replaced the toner before continuing. For the tray 1 any/any issuei there would be toner on the front of the pages as well. 1. Turn the printer on and wait for it to come to a READY state. 2. Open the top and front covers. Do not open the ETB. 3. Defeat the front cover interlock switch. See Figure below. (Insert a folded piece of paper to keep the interlock switch pushed in.)

3 Page 3 of 6 Figure?1:?Front cover interlock switch 4. Wait for the printer to come to READY again. 5. Open the ETB. 6. Remove all the print cartridges. 7. With the ETB open, enter DIAGNOSTICS mode. 8. Enter the COMPONENT TEST menu and execute the test for the ALIENATION MOTOR. 9. Watch the color cartridge alienation bars inside the printer chassis move up and down. See Figure 4.

4 Page 4 of 6 Figure?2:?Color cartridge alienation bars cartridge alienation bars 1 -?Color 10. Verify that both bars are moving up and down. 11. If one of the bars does not appear to move, push in on the top of the black bars for the black cartridge, then check the movement of the color bars again. This issue has typically been seen with the black bar for the black cartridge on the right-hand side (if facing the front of the printer. See Figure 3, call-out 1). 12. If you cannot get the bar to begin moving during the component test, turn the printer off. 13. With the power off, move the bar(s) around and verify that both alienation bars are flush against the printer chassis. (With the power on, the alienation motor prevents the cams from moving freely).

5 Page 5 of Turn the printer on and perform CALIBRATE NOW after the printer comes to READY. NOTE: During shipping, one or both cartridge alienation bars are becoming unseated and freezing up in the disengaged position. So far it has been the smaller piece of the bar for the black cartridge and on the right had side of the printer (facing the front of the printer). This prevents the toner from being delivered to the print drum, and causes blank pages. Broken Cam on Alienation bars Damaged print cartridges

6 Page 6 of 6 Some print cartridges have broken tabs on the on the bottom. The tabs are needed to ensure the laser shutter opens completely. Tools required Standard tools Repair and replacement instructions Remove the chrome bar or just remove the white plastic braces and carefully pull the bars without removing the chrome bar. If the part is broken, contact the resource desk for further instructions as this part cannot be sent to the customer at this time.