Brother HL-1240 - Manual (Page 78)

4-4
Service call indications
If an unrecoverable error occurs, the printer will indicate the need for a service call
by illuminating all the LEDs and then the following combination of LEDs
alternately:
For example, the following are the indications when a Fuser malfunction error
occurs.
Ready
Alarm
Paper
Toner
Data
Drum
Ready
Alarm
Paper
Toner
Data
Drum
Fig. 4-2 LED indications caused by a fuser malfunction error
Service Call Fuser
malfunction
Laser BD
malfunction
Scanner
malfunction
ROM error
Drum ❍ ❍
Ready ❍ ❍
Alarm ❍ ❍ ❍
Data ❍ ❍ ❍ ❍
Service Call D-RAM
error
Service A Service B Engine
Interface
error
Drum ❍ ❍
Ready ❍ ❍
Alarm ❍
Data ❍ ❍ ❍
Service Call NV-RAM
error
Main motor
malfunction
CPU runtime
error
Drum ❍
Ready ❍
Alarm
Data