Brother MFC 4550, Service Manual

Page: 135 / 191

VI –
1
1. ERROR INDICATION
To help the user or the service personnel promptly locate the cause of a problem (if any), the
facsimile equipment incorporates the self-diagnostic functions which display error messages
for equipment errors and communications errors.
For the communications errors, the equipment also prints out the transmission verification re-
port and the communications list.
1.1 Equipment Errors
If an equipment error occurs, the facsimile equipment emits an audible alarm (continuous beep-
ing) for approximately 4 seconds and shows the error message on the LCD. For the error
messages, see [ 1 ] below. As one of the error messages, “MACHINE ERROR xx” includes an
error code which indicates the detailed error causes listed in [ 2 ]. To display an error code for
the other latest error message, make the equipment enter the maintenance mode and press
8 and 2 keys (for details, refer to Chapter V , Section 3.11).
[ 1 ] Error messages on the LCD
Messages on the LCD Probable Cause
CHECK PAPER Even after paper pulling-in operation, the registration sensor
does not detect paper.
COVER OPEN The cover sensor detects that the top cover is not closed or the
sheet feeder cover sensor detects that the sheet feeder cover
is not closed.
PRINTER JAM (1) The paper ejection sensor stays OFF even after the
registration sensor has gone OFF and the paper has been
fed by the specified amount.
(2) The paper ejection sensor stays ON even after it has came
ON and the paper has been fed by the specified amount.
DOCUMENT JAM
■
Document jam
(1) The document length exceeds the limitation (400 or 90 cm)
registered by firmware switch WSW16. (Refer to Chapter
V, Section 3.6.)
(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.)