Document Feeding Problems; Document Can Not Be Fed; Document Double Feeding - Brother MFC-J3520 Service Manual

4.7

Document Feeding Problems

4.7.1 Document can not be fed

User Check
- Check that document is loaded all the way to the end correctly in the document tray and
"ADF READY" appears on the LCD.
- Check that the number of documents loaded in the document tray is within specified
volume.
Step
1 Foreign materials in adjacent
area of the document
separation roller
2 Document separation roller
stained
3 Document detection actuator
not mounted in place
4 Document width actuator not
mounted in place
5 ADF motor harness connection
failure
6 Document detection sensor
harness connection failure
7 Document width sensor
harness connection failure
8 Document pick-up roller worn
out
9 Document detection sensor
defective
10 Document width sensor
defective
11 ADF motor defective or
document feed gear and/or
document separate roller gear
broken
12 Main PCB defective

4.7.2 Document double feeding

User Check
- Check whether a document thinner than the specified one is used.
Step
1 ADF separation pad worn out
Cause
Remove foreign materials.
Clean the document separation roller.
Set the document detection actuator into place.
Set the document width actuator into place.
Reconnect the ADF motor harness.
Reconnect the document detection sensor
harness.
Reconnect the document width sensor harness.
Replace the document separation roller ASSY.
Replace the document detection sensor PCB
ASSY.
Replace the document width sensor PCB
ASSY.
Replace the ADF unit.
Replace the main PCB ASSY.
Cause
Replace the ADF separation pad.
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Solution
Solution
Confidential