HP LaserJet MFP E72535

Symptom

Toner cartridge is installed, but “Not Installed” message displays.

Cause

• Toner cartridge is not properly installed.
• Toner cartridge CRUM harness is defective.
• CRUM PCA or CRUM Chip is defective.
• CRUM connection (modular connector) is defective.
• CRUM joint PCA is defective.
• Bad connection between the main board and the CRUM Joint PCA.

Troubleshooting

• Toner cartridge installation problem:
  – Check if the toner cartridge is properly installed.
  – If the cartridge comes out automatically, check the cartridge fixing hook.
  – If the cartridge fixing hook is damaged, replace the cartridge cap or cartridge.
• CRUM harness problem:
  – Make sure the CRUM harness is correctly connected. Check the modular jack for damage or abnormal assembly.
  – If the modular jack harness is defective, replace it with a new one. If the modular jack has moved into the toner cartridge, remove it.
• CRUM PCA problem or CRUM data problem:
  – Replace the toner cartridge.
• CRUM connection (modular connector) installation problem:
  – Open the front cover. Remove the toner cartridge.
  – Make sure that the CRUM connection (modular connector) is correctly installed.
  – If the modular connector is not installed correctly, open the rear cover and reinstall.
• CRUM joint PCA problem:
  – If the CRUM joint PCA, modular jack pin, or main board interface connector are damaged, replace the PCA (see the previous step).
• Bad connection between the main board and the CRUM joint PCA,:
  – Check the connection between the main board and the CRUM joint PCA. If the connection is bad, replace the harness, the CRUM joint PCA,, or the main board.