e9Smart Tank Plus 651

HP Smart Tank Plus 651 error E9: Sensor failure fix

The HP Smart Tank Plus 651 error E9 appears when the unit cannot detect the position of internal components like the paper or the print carriage. Paper dust accumulation is the primary cause of this interruption. A quick cleanup usually restores functionality.

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Common causes

  • 1Dust buildup on sensors.
  • 2Mechanical misalignment after a jam.
  • 3Foreign object (staple, clip) on the sensor.
  • 4Wear of the optical sensor board.

Solutions

Quick Diagnostics

If the printer fails to start printing and displays E9, the optical paper load sensor likely has accumulated dust.

Step-by-Step Solution

  1. Power off and unplug the printer completely.
  2. Open the access door and remove any paper cartridges.
  3. Use a lint-free cloth to gently wipe the sensor area.
  4. Close everything and power on to retry loading.

Prevention and Maintenance

Clean the input tray regularly with compressed air to prevent dust buildup.

When to Call a Technician

If the E9 error persists after a thorough cleaning, the optical sensor might have suffered an electrical failure.

Equipment Technical Data

  • Technology: Inkjet
  • Connectivity: Wi-Fi, USB
  • Compatible Consumable: GT51/GT52 bottles
  • Recommended Use: Small office
  • Official drivers / firmware

Frequently asked questions

Paper or carriage detection sensors are dirty or misaligned.

Use a dry, soft cloth to remove dust from the path.

Original GT series inks for long printhead life.

Yes, excessive dust and humidity can corrode sensors.