Brother MFC-T4500DW - Noise Comes from Machine; Unusable Device Is Displayed

Confidential
2-92
4.10.7 Noise comes from machine
4.10.8 “Unusable Device” is displayed
< User Check >
- Disconnect the unsupported USB device.
Step Cause Solution
1 Foreign materials in the
recording paper path
Remove foreign materials.
2 Foreign materials around the
maintenance unit
Remove foreign materials.
3 CR encoder strip stained Clean the CR encoder strip.
4 PF encoder disk stained Clean the PF encoder disk.
5 Looseness of the CR timing
belt
Re-hook the CR timing belt properly.
6 Looseness of the switchback
roller belt
Re-hook the switchback roller belt properly.
7 Looseness of the paper feed
roller belt
Re-hook the paper feed roller belt properly.
8 Looseness of the paper
ejection roller belt
Re-hook the paper ejection roller belt properly.
9 Looseness of the 3rd tray
paper feed belt
Re-hook the 3rd tray paper feed belt properly.
10 Looseness of the CIS drive
belt
Re-hook the CIS drive belt properly.
11 Paper feed motor not mounted
in place
Set the paper feed motor into place.
12 Carriage motor not mounted in
place
Set the carriage motor into place.
13 3rd tray paper feed motor not
mounted in place
Set the 3rd tray paper feed motor into place.
14 CR encoder strip defective Replace the CR encoder strip.
15 PF encoder disk defective Replace the PF encoder disk.
16 Maintenance unit defective Replace the maintenance unit.
17 ADF unit defective Replace the ADF unit.
18 Document scanner unit
defective
Replace the document scanner unit.
Step Cause Solution
1 Main PCB defective Replace the main PCB.