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Lexmark MS812dn / MS812dtn

Lexmark MS812dn / MS812dtn

31.21 Error: Capacitive Toner Level Sensing (CTLS) Reading Out of Range

Defect Symptom

Error 31.21 – Capacitive Toner Level Sensing (CTLS) reading out of range. Possible issue exists with the CTLS contacts or Controller Board.

Customer Repair Action & Troubleshooting

  1. Remove and re-install the Imaging Unit; ensure that it is seated properly.

Repair Sequence 1 (Copy into Siebel)

  1. Replace Imaging Unit.

Parts repair 1


Repair sequence 2 (Copy into Siebel)

  1. Replace Controller Board.

  2. If the issue persists even after replacing the Controller Board, CTLS contacts must be replaced. However, doing so would require removal of the printer’s right-side frame. Therefore, request approval from your next level of support to Mech Replace the printer.

Parts repair 2

40X8025 – Controller Board MS310d 40X9656 – Controller Board MS312dn 40X9657 – Controller Board MS315dn, MS415dn 40X8026 – Controller Board MS310dn 40X8027 – Controller Board MS410d 40X8028 – Controller Board MS410dn 40X8029 – Controller Board MS510dn 40X8030 – Controller Board MS610dn 40X8388 – Controller Board MS610de 40X9251 – Controller Board MX310 40X9252 – Controller Board MX410 40X9253 – Controller Board MX51x 40X9254 – Controller Board MX61x


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