Error Codes - Brother HL-720 - B/W Laser Printer Service Manual

1.2

Error codes

In the event of a printer failure, error codes will be indicated as shown below. All the
LEDs and the specific LEDs are turned ON alternately. The specific combination of
ON LEDs indicates the type of error.
Type of error
Fuser Malfunction
Laser BD Malfunction
Scanner Malfunction
ROM Error
D-RAM Error
Service A *
Service B *
NV-RAM Error *
CPU Runtime Error
* Refer to the further description of those errors as follows;
Service A:
Service B:
CPU Runtime Error:
LED error indications
FUSER MALFUNCTION
DRUM
ALARM
READY
(PAPER)
DATA
(TONER)
DATA READY














Address Error
Bus Error
Other CPU errors such as Illegal Instruction or Operation
Overflow
A lapse of time
: OFF : ON
IV-3
ALARM DRUM