Document Feeding Problems; No Feeding - Brother DCP-8070D Service Manual

11. DOCUMENT FEEDING PROBLEMS

Problems related to document 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.

11.1 No Feeding

<User Check>
- Check if the document is inserted correctly to the depths.
- Check whether the document is 50 or less sheets. (CCD model)
Check whether the document is 20 or less sheets. (CIS model)
- Check if the ADF cover is closed.
Step
Document front
actuator 1
1
catching on some
position
Document front
2 sensor 1 harness
connection failure
ADF motor
3 harness
connection failure
Document front
sensor 1
4 malfunction
Feed roller holder
5 ASSY failure
ADF relay PCB
6 failure
Driver PCB failure
7
ADF motor failure
8
Main PCB failure
9
Cause
Does the document front
actuator 1 move
smoothly?
Is the harness of the
document front sensor 1
connected securely?
Is the harness of the ADF
motor connected
securely?
Does the document front
sensor 1 move smoothly?
(Check it following the
procedure described in
"Maintenance mode
Though the ADF motor
rotates, does the supply
roller rotate?
Is the problem solved
after replacing the ADF
relay PCB?
Is the problem solved
after replacing the driver
PCB?
Is the problem solved
after replacing the ADF
motor?
Is the problem solved
after replacing the main
PCB?
Check Result
No
No
No
No
32")
Yes
Yes
Yes
Yes
Yes
3-77
Remedy
Re-assembly the
document front actuator
1.
Reconnected the harness
of the document front
sensor 1.
Reconnected the harness
of the ADF motor.
Replace the document
front sensor 1.
Replace the feed roller
holder ASSY.
Replace the ADF relay
PCB.
Replace the driver PCB.
Replace the ADF motor.
Replace the main PCB.
Confidential