Paper Feeding Problems; No Feeding; Double Feeding - Brother DCP-8070D Service Manual

4. PAPER FEEDING PROBLEMS

Problems related to paper feeding are end user recoverable if following the User Check
items. If the same problem occurs again, follow each procedure in the order of the number
described in the Step column in the tables below.
4.1

No Feeding

Step
Dirt on PE sensor
1
Edge actuator
2 catching on some
position
Roller holder
3 ASSY catching on
some position
Separation pad or
roller holder ASSY
4 failure
Pressure plate
5
gear damage
T1 solenoid failure Does the T1 solenoid
6
T1 solenoid
pathway of the
high-voltage
7 power supply PCB
broken or
registration front
sensor failure
Main PCB failure
8
Main motor failure
9
4.2

Double Feeding

Step
Separation pad or
1 roller holder ASSY
failure
Cause
Is there paper powder in
the PE sensor?
Does the edge actuator
move smoothly?
Does the roller holder
ASSY move smoothly?
Is the surface of the
separation pad or the
pickup roller dirty or worn
out?
Is the pressure plate gear
damaged?
work correctly?
Is the problem solved
after replacing the high-
voltage power supply
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
Is the problem solved
after replacing the main
motor ASSY?
Cause
Is the surface of the
separation pad worn out?
Check Result
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Check Result
Yes
3-41
Remedy
Clean the PE sensnor.
Re-assembly the edge
actuator.
Re-assembly the roller
holder ASSY.
1) Clean the surface of
the separation pad or
pickup roller.
2) Replace the separation
pad or pickup roller.
Replace the paper tray.
Replace the T1 solenoid.
Replace the high-voltage
power supply PCB ASSY.
Replace the main PCB
ASSY.
Replace the main motor
ASSY.
Remedy
Replace the PF kit.
Confidential