Joint Cover Assy Open; Back Cover Open; Unusual Noise Generated From The Machine - Brother MFC-9130CW Service Manual

4.14.4 Joint cover ASSY open

Joint cover ASSY in open state.
<User Check>
- Check that the joint cover ASSY is completely closed.
Step
1
2
3
4

4.14.5 Back cover open

Back cover in open state.
<User Check>
- Check that the back cover is completely closed.
- Set duplex tray correctly.
Step
1
2
3
4

4.14.6 Unusual noise generated from the machine

<User Check>
- Check that the covers are closed correctly.
- Set each paper tray correctly.
Step
1
2
3
Cause
Harness connection failure of
the high-voltage power supply
PCB
The member inside the joint
cover ASSY that pushes the
top cover sensor is broken
Top cover sensor failure
Main PCB failure
Cause
Harness connection failure of
the back cover sensor
The member inside the back
cover that pushes the back
cover sensor is broken
Back cover sensor failure
Main PCB failure
Cause
Identify the location where
noise is produced since the
cause of the problem changes
depending on the location.
Insufficient part lubrication
Bend or failure of part
Check the high-voltage power supply PCB
harness connection and reconnect it.
Replace the joint cover ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Check the harness connection of the back
cover sensor and reconnect it.
Replace the back cover.
Replace the back cover sensor harness
ASSY.
Replace the main PCB ASSY.
When identifying the location, check if foreign
object is present around the location.
(Replacement of the part set at the location.)
Lubricate the part again.
Replace the part.
2-123
Remedy
Remedy
Remedy
Confidential