Brother DCP-9010CN Service Manual page 146

■ Error code F4
Replace WT Box
Replace the Waste Toner Box. Refer to the User's Guide for instructions.
Waste toner box full.
(Overcurrent flows to the cleaning roller due to the end of life of the cleaning roller.)
Note:
The same message appears in the case of the error code CF.
<User Check>
- Replace the waste toner box with a new one.
Step
1 HVPS control PCB failure
2 Engine PCB failure
■ Error code F8
Machine Error F8
Battery connection error
Step
1 Harness connection failure of
battery
2 Battery failure
3 Main PCB failure
■ Error code F9
Machine Error F9
Power turned OFF while the function code 74 is being executed and "PARAMETER INT" is
being displayed
Step
1 Incorrect operation when setting
EEPROM customize code
Cause
Cause
Cause
3-54
Remedy
Replace the HVPS control PCB ASSY.
Replace the engine PCB ASSY.
Remedy
Check the connection of the battery
connector and reconnect it.
Replace the battery ASSY.
Replace the main PCB ASSY.
Remedy
Re-enter the EEPROM customize code.
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