843.00MB2236adw

Fix Lexmark MB2236adw Scanner Error Code 843.00

The 843.00 service error indicates a communication failure, physical blockage, or motor torque drop within the flatbed scanner unit of the Lexmark MB2236adw. The contact image sensor (CIS) carriage fails to complete its initial homing sequence.

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Common causes

  • 1Dust, dirt, or correction fluid on the white reference tape causing calibration errors.
  • 2Mechanical bind in the scanner carriage glass rail, drive belt, or motor pulley.
  • 3Insufficient electrical current during start-up due to a faulty power bar or UPS.

Solutions

Troubleshooting and Hardware Verification

1. Inspect Carriage Homing Activity

  • Turn on the printer and look through the scanner glass.
  • Watch if the LED scan bar lights up and shifts briefly left and right (calibration dance).
  • If you hear a loud grinding noise, the scan bar is likely stuck against the chassis side-frame or the drive belt has skipped its gear tracks.

2. Clean the White Reference Calibration Strip

  • Locate the narrow white plastic calibration band mounted on the underside of the scanner glass frame on the far left.
  • Clean this white reference point meticulously. Any smudges, white-out, or toner dust will cause the optical calibration routine to fail, triggering the 843.00 fault.
  • Wipe the glass with a high-purity isopropyl alcohol wipe to ensure absolute clarity.

3. Perform a Hard Power Cycle

  • Unplug the power cable from the back of the printer while it is powered on.
  • Disconnect any USB, Ethernet, or telephone cords to prevent parallel grounding or bus conflicts.
  • Wait for 2 minutes to clear the printer's volatile RAM.
  • Plug the power cord directly into an isolated AC wall outlet (do not use power strips, surge protectors, or extension cords) and check if the error resolves.

Steps to follow

  1. 1

    Disconnect all cables

    Switch the printer off, disconnect data lines, and isolate it from the wall outlet.

  2. 2

    Clean the flatbed scanner glass

    Use glass cleaner on a lint-free cloth to clean the scanner surface, paying close attention to the calibration area on the left edge.

  3. 3

    Connect and test

    Plug the device back into the main wall socket, power it on, and verify the scanning carriage glides without hesitation.

Frequently asked questions

Generally, this hard error locks printer operation. If the issue is transient, starting the machine with the data cable detached may let you access print queues temporarily.

If cleaning the glass and power-cycling does not silence a persistent grinding noise, a hardware replacement of the scanner flatbed module is required.

Fix Lexmark MB2236adw Scanner Error Code 843.00 | Vimazdev