Brother DCP-7055 Service Manual page 82

■ Error code 75
Cooling Down
Wait for a while
Cooling down the inside of the machine to protect it.
<User Check>
• Leave the machine for a while as the power remains ON.
Step
1 Internal temperature sensor failure Replace the internal temperature sensor.
2 Main PCB failure
■ Error code 76
Print Unable 76
Turn the power off and then back on again.
Fuser unit error. (The center thermistor detects the sharp temperature rise.)
Error code 78
Print Unable 78
Turn the power off and then back on again.
Fuser unit error. (The center thermistor detects the sharp temperature fall.)
Step
1 Fuser unit failure
Low voltage power supply PCB
2
failure
Paper eject sensor PCB failure
3
4 Main PCB failure
■ Error code 7A
Print Unable 7A
Turn the power off and then back on again.
A lock signal of the main motor cannot be detected.
Step
Flat cable connection failure of
1
main motor
2 Main motor failure
Low voltage power supply PCB
3
failure
4 Main PCB failure
Cause
Cause
Cause
2-45
Remedy
Replace the main PCB ASSY.
Remedy
Replace the fuser unit.
Replace the low voltage power supply PCB
ASSY.
Replace the paper eject sensor PCB
ASSY.
Replace the main PCB ASSY.
Remedy
Check the flat cable connection of the main
motor and reconnect them.
Replace the main motor.
Replace the low voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
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