Brother MFC640CW Service Manual page 269

Error Code
(Hex)
E7 Not used.
E8 Data scanning error during
transmission.
E9 Not used.
EA Document removed at
phase B.*
EB-ED Not used.
EE Playback IC error.
EF-F2 Not used.
F3, F5 Internal software error.
F4 Not used.
F6 PC interface error.
F7 Not used.
F8 Battery harness connection
failure
(Available in the
maintenance mode only)
F9-FE Not used.
FF Memory management
error.
* Phase B: FAX negotiation stage between sending machine and receiving machine
Symptom
9 - 1 8
Probable Cause
CIS defective
Main PCB defective
Document front sensor
actuator caught on the
surrounding parts
Document front sensor
defective
Main PCB defective
Main PCB defective
Main PCB defective
Main PCB defective
Battery harness not
inserted correctly.
Main PCB defective
Solution
Replace the scanner
cover (scanner unit).
Replace the main PCB.
Correct the surrounding
parts on which the
actuator caught.
Replace the document
front sensor.
Replace the main PCB.
Replace the main PCB.
Replace the main PCB.
Replace the main PCB.
Correct the connection.
Replace the main PCB.
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