Brother MFC8500 Service Manual page 136

Messages on the LCD
(In the 1st row)
CHECK DOCUMENT
CHECK ORIGINAL
(In the 2nd row)
Remove document, then
press STOP KEY.
CLEAN UP SCANNER
SCANNER ERROR
TONER LOW
(In the 1st row)
TONER EMPTY
(In the 2nd row)
Open cover, then replace
new toner cartridge.
(In the 1st row)
COOLING DOWN
(In the 2nd row)
WAIT FOR A WHILE
n Document jam
(1) The document length exceeds the limitation (400 or 90 cm)
registered by firmware switch WSW16. (Refer to Appendix
2.)
(Both the document front and rear sensors stay ON after the
document has been fed by the registered length.)
(2) The document rear sensor detects no trailing edge of a
document after the document has been fed by 400 cm.
(The document rear sensor stays ON even after the
document has been fed when the document front and rear
sensors were OFF and ON, respectively.)
n Document loading error
(1) The document rear sensor detects no leading edge of a
document within 10 seconds from the start of document
loading operation.
(The document rear sensor stays OFF even after the
document has been fed when the document front sensor
was ON.)
(2) The loaded document is too short.
(Since the document is shorter than the distance between
the document front and rear sensors, the document front
sensor is turned OFF before the document rear sensor is
turned ON.)
In the scanning compensation data list printed by the mainte-
nance-mode function code 05, less than fifty percent of the white
level data is faulty.
(This message may appear only in the maintenance mode.)
In the scanning compensation data list printed by the
maintenance-mode function code 05, fifty percent or more of the
white level data is faulty.
(This message may appear only in the maintenance mode.)
The toner sensor has detected that there is not enough toner.
The toner sensor has detected that there is no toner in the
cartridge or that no toner cartridge is loaded. If this message
appears, recording is no longer possible.
The controller, which monitors the internal resistance of the in-
casing temperature sensor (thermistor) and heater thermistor,
has detected that the temperature inside the equipment or the
heater temperature exceeded the specified level. If either
temperature exceeds the preset level, recording is no longer
possible.
VI - 2
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Probable Cause
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