3 ] Communications Problems; 4 ] Paper/Document Feeding Problems - Brother MFC640CW Service Manual

[ 3 ] Communications problems

Problem
(1) No tone is transmitted.

[ 4 ] Paper/document feeding problems

Problem
(1) The "Enter Fax No." message
does not appear although
documents are set.
(2) Document not fed.
(3) Document double feeding
(4) Document jam
(5) Recording paper not fed.
(6) Recording paper jam
• Main PCB
• MJ PCB
• Sensors by using maintenance-mode function code 32. (Refer
to Chapter 8, Section
• Document front sensor actuator
• Main PCB
• ADF and its related sections
• ADF motor and its harness
• Document feed rollers and their related gears
• Main PCB
• ADF parts
• ADF motor
• Document rear sensor actuator
• Main PCB
• PF-related gears
• Main PCB
• Paper feed motor
• Paper tray
• Paper feeding mechanism
• Check that the carriage-head flat cable is connected to the
carriage PCB.
9 - 2 9
Check:
Check:
8.4.7.)
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