First the drum light is flashing yellow the ready is flashing green those two flash together then alarm is red flas and data is yellow.
Question edited for full 'make model (what it is)'
Question moved to Brother HL category.
chapter 3 onwards of the manual. The drum light means you need a service call.
https://download.brother.com/welcome/doc002127/ZLe_UG_eng.pdf
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