Brother HL-4140CN Service Manual page 86

■ Error code 81
Calibrate
Calibration failed. See Troubleshooting chapter in User's Guide.
Incorrect density sensor measurement value when implementing adjustment of color density.
Error code 82
Calibrate
Calibration failed. Press Go, and try again.
Density patch measurement is not completed normally when implementing adjustment of color
density.
<User Check>
- Check if the genuine toner cartridges are installed in the correct order of colors.
- 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.
- Replace the waste toner box with a new one.
Step
1 Foreign object is affixed around
the density sensor
2 Harness connection failure of
registration mark sensor holder
ASSY
3 Density sensor failure
4 High-voltage power supply PCB
failure
5 Engine PCB failure
6 Low-voltage power supply PCB
failure
7 Main PCB failure
■ Error code 83
Drum Stop
Replace the Drum Unit. Refer to the instructions in the carton of new drum.
Drum unit error. (An drum error occurred after the drum unit reached the end of life.)
<User Check>
- Replace the drum unit with a new one and reset the drum counter.
(Refer to "2.3 Parts Life Reset Function" in Chapter
Step
1 Main PCB failure
Cause
Cause
2-55
Remedy
Remove the foreign object affixed around
the density sensor.
Check the harness connection of the
registration mark sensor holder ASSY and
reconnect it.
Replace the registration mark sensor
holder ASSY.
Replace the high-voltage power supply
PCB ASSY.
Replace the engine PCB ASSY.
Replace the low-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
5.)
Remedy
Replace the main PCB ASSY.
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