Brother MFC4820C Service Manual page 176

Error Code
(Hex)
84 Recording paper jam.
(The paper width sensor and/or registration sensor has
detected a paper jam.)
88 Recording paper jam.
(Even after paper pulling-in operation, the registration
sensor is still OFF.)
8A The paper feed motor does not rotate.
8B The paper feed motor stops suddenly.
8D The paper feed motor rotates in the reverse direction.
8E Max. speed error in the paper feed motor.
A1 Scanner unit or ink slot cover opened.
A4 50% or more faulty of white level data.
AC Less than 50% faulty of white level data.
AF CIS positioning error.
B1 Dark level offset data level error for scanning.
B2 Gain control data level error for scanning.
B3 Scan area left edge detection error.
B4 Scan area right edge detection error.
Horizontal scanning edge reduction detection error in
B5
scanning area setting
Horizontal scanning edge enlargement detection error in
B6
scanning area setting
Error factor
8 -5
Check:
• Registration sensor
actuator
• If the paper width
sensor is defective,
replace the needle
tube & head flat cable
ASSY.
• Main PCB
• Paper feed motor
• PF encoder sensor
• Driver PCB
• Main PCB
• Scanner open sensor
actuator
• Ink slot cover open
sensor actuator
• Control panel PCB
• CIS unit
• Driver PCB
• Main PCB
• CIS unit
• Driver PCB
• Main PCB
• CIS unit
• CIS flat cable
• Driver PCB
• Main PCB
• CIS unit
• Main PCB
• CIS unit
• Main PCB
• Black markings on
the white-level
reference film inside
the scanner top cover