Rapid Temperature Rising Failure (Center Thermistor); Rapid Temperature Falling Failure (Center Thermistor); No Detection Of Main Motor Synchronous Signal; Dirt On Corona Wire - Brother DCP-8070D Service Manual

■ Error code 76
Print Unable 76
Turn the power off and then back on again.

Rapid temperature rising failure (center thermistor)

Error code 78
Print Unable 78
Turn the power off and then back on again.

Rapid temperature falling failure (center thermistor)

Step
1 Fuser unit failure
2 Main PCB failure
■ Error code 7A
Print Unable 7A
See Troubleshooting and routine maintenance chapter in User's
Guide.

No detection of main motor synchronous signal

Step
1 Motor failure
2 Main PCB failure
■ Error code 7D
Drum Error
Open the Front Cover and slide the blue tab across the Drum Unit
several times.
Dirt on corona wire (detect discharge error)
<User Check>
• Clean the corona wire in the drum unit.
• Replace the drum unit with a new one.
Step
Dirt or dust on drum unit
1
electrodes
2 Charge HVPS PCB failure
3 Main PCB failure
Cause
Cause
Cause
3-21
Remedy
Replace the fuser unit.
Replace the main PCB ASSY.
Remedy
Replace the main motor.
Replace the main PCB ASSY.
Remedy
Clean the electrodes of the main body and
the drum unit. (Refer to Fig.
Replace the charge HVPS PCB ASSY.
Replace the main PCB ASSY.
3-3)
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