Getting this message Replace pcu on our CL1000n, what do we need to do?

The printer is set to display the "replace PCU" message after a set number of copies. The only way to clear the message is to replace the color PCU that the message mentions.

This must be done before drum is replaced.
Resets counter.

Start the SP mode and execute the
New Unit Set:
• PCU: SP5-999-001 ∼ 004

I suspect that it is the PCU causing the problem, and the message should clear once the PCU is installed and it (automatically) runs it's calibration cycle. Likely the toner auger gear has seized on the PCU, and broken. If the light does not go off after installing the PCU, then you may need a technician, as the toner motor may not be working, or there is a blockage within the toner hopper itself.....but again it is likely the PCU, especially if the toner bottle was empty when it needed replacement. Was it empty?? Did the machine work for a few days, or at least for a while? If so, it seems like too much of a coincidence that this problem would come up at this time.

Good Luck :)

Yes :
You should replace the PCU if prints show any of the following symptoms.

• Colors are missing, faint, or partially blurred.
• Toner smears appear.
• White or color rivers appear.
• White or colored streaks appear.
• 1. Important: Switch off the device and disconnect it at the mains.
  2. Open the right side cover.
  3. Pull the green levers as shown to release the inner cover.
  4. Lift the inner cover upwards.
  5. Squeeze the green lever on the black PCU.
  6. Pull the unit carefully out of the device and dispose of it in accordance with your local environmental policy.
  7. Place the new PCU on a flat surface.
  8. Peel off the tape from around the new PCU.
  9. Remove the top cover from the PCU. DO NOT remove the bottom cover at this stage.
  10. Rest the new PCU in the device as shown.
  1. Push the PCU into the device while holding the bottom cover. You will hear a click when the PCU has locked into place.
  2. Lower the inner cover.
  3. Push the two green levers as shown to secure the cover.
  4. Close the side cover.
  5. Connect the device at the mains, switch it on and wait for the self-test operation to finish.
  6. Please remember to rate all users who assist you for free :)
     

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

Shake it gently (the pcu)

pcu

Sc310 is a high voltage error. This could be something serious, or something very simple. If you just replaced the PCU cartridge, it is possible that it is bad. Put the old one back in and try it.

If you did not replace the PCU, I think I would replace it, because the high voltage section in the PCU may be shorted. Other than that, you can make sure everything is clean inside, but chances are the HV is bad.

replace the PCU cartridge

no, im with you let it go bad first! when it starts to go bad the print will go bad

1. Close the top cover and carry out the following instructions to reset the Maintenance Counter.
2. Press the [Menu] key on the Operation Panel.
3. Scroll to display [Menu: Maintenance].
4. Press the [Enter] key.
5. Scroll to display [Maint. Reset: PCU] and press the [Enter] key.
6. Press the [Enter] key when [PCU Press # to Start] is displayed.
7. Press the [Enter] key when [Counter is Reset] is displayed.
8. The Maintenance Counter is now reset - the display will return to the Maintenance menu after about 2 seconds.
9. Press the [Online] key and check that [Ready] is displayed.

Replace the pcu cartridge. If you have already done so, check to see if it is turning. You may have a drive problem.