If any of the below OKI error codes occur during printing then first re-seat (unlock, then lock) the corresponding toner cartridge.
When the error reoccurs, then wear a mask (toner spills can be dangerous to your lungs), then: unlock the toner cartridge, remove it, vacuum away any of the toner spill in the printer and on the cartridge, reinsert it and lock it.
The cause is a mechanical issue that happens both when only using original OKI toner cartridges and OEM or third party ones: wear of the parts over time will spill more and more toner causing the locked cartridge detection to cause a faulty result due to excessive spilled toner build-up.
For me this mostly happens on the colour cartridges and far less often on the black cartridge.
Error code list for the message at [Wayback/Archive] Troubleshooting | OKI “Check Toner Cartridge. Improper Lock Lever Position. Error: 544, 545, 546, 547”:
- 544: Yellow (abbreviated as Y)
- 545: Magenta (abbreviated as M)
- 546: Cyan (abbreviated as C)
- 547: Black (abbreviated as K, but sometimes as B)
On the above page self the solution lists as
The Wiert Corner - irregular stream of stuff 