Brother MFC-9420CN Service Manual page 240

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Error Code
(Hex)
AF
CIS positioning error.
B0
Not used.
B1
Dark level offset data level
error for scanning.
(Not used.)
B2
Gain control data level error
for scanning. (Not used.)
B3
Scan area left edge detection
error. (Not used.)
B4
Scan area right edge detection
error. (Not used.)
B5
Horizontal scanning edge
reduction detection error in
scanning area setting
(Not used.)
B6
Horizontal scanning edge
enlargement detection error in
scanning area setting
(Not used.)
B7
A/D converter reference
voltage error (at High level).
B8
A/D converter reference
voltage error (at Low level).
(Not used.)
B9
Light emission intensity error
of the LED array (Exceeding
the upper limit).
BA
Not used.
BB
White level data error.
BC
Not used.
BD
Black level data error.
BE
Scan starting edge detection
error. (Not used.)
BF-CF
Not used.
Symptom
CIS flat cable broken or
not connected
CIS motor harness not
connected properly
CIS defective
Main PCB defective
Main PCB defective
CIS defective
Main PCB defective
CIS defective
Main PCB defective
CIS defective
Main PCB defective
9 - 1 3
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Probable Cause
Correct the cable
connection.
Replace the scanner cover
(scanner unit).
Correct the harness
connection.
Replace the scanner cover
(scanner unit).
Replace the main PCB.
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Replace the main PCB.
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Replace the scanner cover
(scanner unit).
Replace the main PCB.
Replace the scanner cover
(scanner unit).
Replace the main PCB.
Replace the scanner cover
(scanner unit).
Replace the main PCB.
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Solution
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