Brother MFC-9125CN - Troubleshooting and routine maintenance; If you are having difficulty with your machine; Paper handling difficulties; Print quality difficulties

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■ Error code 81
Incorrect density sensor measurement value when implementing adjustment of color density
from the control panel cover ASSY.
Error code 82
Density patch measurement is not completed normally when implementing adjustment of color
density from the control panel cover ASSY.
<User Check>
- Check if there is a scratch, dirt or the like on the belt unit. If there is, replace the belt unit with
a new one.
- Check if the genuine toner cartridges are installed in the correct order of colors.
Calibrate
Calibration failed. See Troubleshooting chapter in User’s Guide.
Calibrate
Calibration failed. Press Start, and try again.
Step Cause Remedy
1 Density sensor shutter catching
on some position
Correct catching of the density sensor
shutter.
2 Harness connection failure of
registration mark L PCB ASSY
Check the harness connection of the
registration mark L PCB ASSY and
reconnect it.
3 HVPS control PCB failure Replace the HVPS control PCB ASSY.
4 Engine PCB failure Replace the engine PCB ASSY.
5 Main PCB failure Replace the main PCB ASSY.
6 Registration mark L PCB failure Replace the registration sensor holder
ASSY.