Brother DCP-9010CN Service Manual page 120

■ Error code 5F
WT Box End Soon
The waste toner box near full. (The waste toner sensor detects the always ON state.)
Note:
The same message appears in the case of the error code F2.
<User Check>
- Prepare a new waste toner box.
Step
1 Harness connection failure of
waste toner sensor
2 Waste toner sensor failure
3 HVPS control PCB failure
4 Main PCB failure
Cause
3-28
Remedy
Check the harness connection of the
waste toner sensor and reconnect it.
Check the sensor performance following
the procedure described in
32". If any problem occurs, replace the
waste toner sensor.
Replace the HVPS control PCB ASSY.
Replace the main PCB ASSY.
"Function code
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