Brother HL 5030 - B/W Laser Printer Service Manual page 185

Further details of Service Errors
As for Laser Unit Failure and Main PCB Failure, further details of these errors can be
seen by pressing the Job Cancel button twice while holding down the Go button.
Toner
Drum
Paper
Status
Laser Unit Failure
Toner
Drum
Paper
Status
Laser BD Malf
Toner
Drum
Paper
Status
Scanner Malf
6-5B
Toner
Drum
Paper
CPU Runtime Error
Status
Main PCB Failure
Toner
Drum
Paper
Status
Service A
Toner
Drum
Paper
Status
Service B
Toner
Drum
Paper
Status
Toner
Drum
Paper
Status
ROM Error
Toner
Drum
Paper
Status
NV-RAM Error
Toner
Drum
Paper
Status
D-RAM Error