Brother International HL-720 Service Manual - Page 132

LED error indications, ALARM, READY, PAPER, TONER, A lapse of time

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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 DATA READY ALARM DRUM * Refer to the further description of those errors as follows; • Service A: Address Error • Service B: Bus Error • CPU Runtime Error: Other CPU errors such as Illegal Instruction or Operation Overflow LED error indications FUSER MALFUNCTION DRUM ALARM READY (PAPER) DATA (TONER) A lapse of time : OFF : ON IV-3

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IV-3
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
DATA
READY
ALARM
DRUM
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:
Address Error
•
Service B:
Bus Error
•
CPU Runtime Error:
Other CPU errors such as Illegal Instruction or Operation
Overflow
LED error indications
FUSER MALFUNCTION
DRUM
ALARM
READY
(PAPER)
DATA
(TONER)
A lapse of time
: OFF
: ON