Samsung MultiXpress M537x series Basic Manual page 202

Replacing the imaging unit
6 Remove the sealing tape.
7 Hold the handles on the new imaging unit, and push the imaging unit
until it locks into place. Then, close the inner cover.
8 Hold the toner cartridge and align it with the corresponding slot inside
the machine. Insert it back into its slot until locks in place.
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9. Troubleshooting