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Looping Initialization: 3000/3600/3800/CP3505

If your Color LaserJet 3000 series laser printer gets stuck in an initialization loop at start up, repeating various stages indefinitely without ever reaching the Ready state, the cause is most likely related to a simple “door open” condition.

Most printers use switches and sensors to detect when doors are open. If a door is left open, or if one of these switches fails, you will get an error condition – either a blinking light (on lower-level printers) or a “Door Open” message on the printer’s display.

In this series, if the “door open” condition is present when the printer is powered up, it will just keep cycling through the startup stages (memory test, initialization) without ever reaching the ready state. If your printer behaves like this…

  1. Check to make sure both doors are fully closed.
  2. Check if the actuator tabs for the door open switch are intact. The door open switch is actuated by tabs in the front door and the top fuser door (Figs. A, B, C). The one on the front door is detachable. Replace the appropriate door or cover if a tab is missing or broken.
  3. If all of that looks good, the interlock switch may be bad.
  4. Swap the formatter if all else fails.
RM1-2671 Upper Cover (Fuser Door), Simplex models
RM1-2673 Upper Cover (Fuser Door), Duplex models
RM1-2714 Front Cover, Simplex models
RM1-2715 Front Cover, Duplex Models
RM1-2670 Interlock-switch
4700 fuser art

Looping Initialization: 3000/3600/3800/CP3505

If your Color LaserJet 3000 series laser printer gets stuck in an initialization loop at start up, repeating various stages indefinitely without ever reaching the Ready state, the cause is most likely related to a simple “door open” condition.

Most printers use switches and sensors to detect when doors are open. If a door is left open, or if one of these switches fails, you will get an error condition – either a blinking light (on lower-level printers) or a “Door Open” message on the printer’s display.

In this series, if the “door open” condition is present when the printer is powered up, it will just keep cycling through the startup stages (memory test, initialization) without ever reaching the ready state. If your printer behaves like this…

  1. Check to make sure both doors are fully closed.
  2. Check if the actuator tabs for the door open switch are intact. The door open switch is actuated by tabs in the front door and the top fuser door (Figs. A, B, C). The one on the front door is detachable. Replace the appropriate door or cover if a tab is missing or broken.
  3. If all of that looks good, the interlock switch may be bad.
  4. Swap the formatter if all else fails.
RM1-2671 Upper Cover (Fuser Door), Simplex models
RM1-2673 Upper Cover (Fuser Door), Duplex models
RM1-2714 Front Cover, Simplex models
RM1-2715 Front Cover, Duplex Models
RM1-2670 Interlock-switch

Looping Initialization: 3000/3600/3800/CP3505

If your Color LaserJet 3000 series laser printer gets stuck in an initialization loop at start up, repeating various stages indefinitely without ever reaching the Ready state, the cause is most likely related to a simple “door open” condition.

Most printers use switches and sensors to detect when doors are open. If a door is left open, or if one of these switches fails, you will get an error condition – either a blinking light (on lower-level printers) or a “Door Open” message on the printer’s display.

In this series, if the “door open” condition is present when the printer is powered up, it will just keep cycling through the startup stages (memory test, initialization) without ever reaching the ready state. If your printer behaves like this…

  1. Check to make sure both doors are fully closed.
  2. Check if the actuator tabs for the door open switch are intact. The door open switch is actuated by tabs in the front door and the top fuser door (Figs. A, B, C). The one on the front door is detachable. Replace the appropriate door or cover if a tab is missing or broken.
  3. If all of that looks good, the interlock switch may be bad.
  4. Swap the formatter if all else fails.
RM1-2671 Upper Cover (Fuser Door), Simplex models
RM1-2673 Upper Cover (Fuser Door), Duplex models
RM1-2714 Front Cover, Simplex models
RM1-2715 Front Cover, Duplex Models
RM1-2670 Interlock-switch
4700 fuser art




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