Brother MFC620CN Service Manual page 326

Error Code
(Hex)
A4 50% or more faulty of
white level data.
(Not used.)
A5 FAX scanning failure (1st
time)
A6 FAX scanning failure
(retry)
A7 Mismatch between the
CIS type and ROM data
A8-AB Not used.
AC Less than 50% faulty of
white level data.
(Not used.)
AD-AE Not used.
AF CIS positioning error.
B0 Not used.
B1 Dark level offset data
level error for scanning.
(Not used.)
Symptom
9 - 1 3
Probable Cause
CIS flat cable not
connected properly
CIS defective
Main PCB defective
CIS defective
White-level reference
film stained in the
scanner cover
Main PCB defective
Scanner cover
containing the
improper CIS type
installed at repair
CIS defective
Main PCB defective
CIS flat cable broken
or not connected
CIS motor harness not
connected properly
CIS motor defective
Drive unit defective
CIS defective
Main PCB defective
CIS defective
Main PCB defective
Solution
Correct the connection.
Replace the scanner
cover (scanner unit).
Replace the main PCB.
Replace the scanner
cover (scanner unit).
Replace the main PCB.
Correct the ROM data.
Set up the CIS by
Function code 59
Replace the scanner
cover (scanner unit).
Replace the main PCB.
Correct the cable
connection.
Replace the scanner
cover (scanner unit).
Correct the harness
connection.
Replace the scanner
cover (scanner unit).
Replace the scanner
cover (scanner unit).
Replace the scanner
cover (scanner unit).
Replace the main PCB.
Replace the scanner
cover (scanner unit).
Replace the main PCB.
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