Brother MFC640CW Service Manual page 260

Error Code
(Hex)
5D-5F Not used.
60 Paper width sensor (media
61 sensor) error.
62
63-7C Not used.
7D Any of the ink dot
counters has counted up to
the specified number of
dots, meaning the end of
the head service life.
(Not used.)
7E No head parameters stored
in the EEPROM.
(This code may appear
only in the maintenance
mode.)
7F Print engine error.
(Not used.)
80 At the start of FAX
message printing, the
controller detects that
paper is smaller than A4
size in width.
Symptom
9- 9
Probable Cause
Paper width sensor
broken
Head flat cables or
carriage-head flat cable
broken
Main PCB defective
The service life of the
head/carriage unit has
been expired.
No head property data
has been entered
Main PCB defective
Paper smaller than the
specified size loaded in
the paper tray
Platen stained
Paper width sensor
broken
Paper width sensor not
adjusted
Main PCB defective
Solution
Clean the platen.
Replace the carriage
PCB ASSY.
Replace the carriage
PCB ASSY.
Replace the main PCB.
Replace the
head/carriage unit.
Enter the head property
data.
Replace the main PCB.
Load the correct size of
paper.
Clean the platen.
Replace the carriage
PCB ASSY.
Adjust the margin for
near-edge printing with
Function code 66 in the
maintenance mode.
Replace the main PCB.
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