Brother DCP-7055 Service Manual page 102

■ Error code DD
Print Unable XX
See Troubleshooting and routine maintenance chapter in User's Guide.
Fuser unit failure except error code 6A, 6B, 6C, 6D, 6E, 6F, 76, 78, DE and E2.
<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step
Harness connection failure
1 between fuser unit connector and
paper eject sensor PCB ASSY
Harness connection failure
between fuser unit connector and
2
low voltage power supply PCB
ASSY
Harness connection failure
3 between paper eject sensor PCB
and main PCB
Paper eject sensor PCB failure
4
Low voltage power supply PCB
5
failure
6 Main PCB failure
7 Fuser unit failure
■ Error code DE
Print Unable XX
Turn the power off and then back on again.
When the center thermistor is higher than the idle temperature, it is detected that the side
thermistor temperature is lower than 60 °C.
<User Check>
• Turn OFF and ON the power and check if the machine recovers.
Step
Harness connection failure
1 between paper eject sensor PCB
ASSY and fuser unit
Side thermistor or center
2
thermistor failure
Paper eject sensor PCB failure
3
4 Main PCB failure
Cause
Cause
2-65
Remedy
Check the harness connection between the
fuser unit connector and paper eject sensor
PCB ASSY, and reconnect it.
Check the harness connection between the
fuser unit connector and low voltage power
supply PCB ASSY, and reconnect it.
Check the harness connection between the
paper eject sensor PCB and main PCB,
and reconnect it.
Replace the paper eject sensor PCB
ASSY.
Replace the low voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Replace the fuser unit.
Remedy
Check the harness connection between the
paper eject sensor PCB ASSY and fuser
unit, and reconnect it.
Replace the fuser unit.
Replace the paper eject sensor PCB
ASSY.
Replace the main PCB ASSY.
Confidential