Document Detection Sensor Detects That Document Is Pulled Out During; Adf Cover Sensor Detects Opened Cover State - Brother MFC-J3520 Service Manual

Error Code A3

Document Jam
Document detection sensor detects that document is pulled out during document
scanning. Or, the document scanning position sensor cannot detect document within
specified time.
User Check
- Remove the jammed document.
Step
1 Foreign materials in the
document feeding path
2 Document detection actuator
caught on the surrounding
parts
3 Document scanning position
actuator out of place
4 Document scanning position
sensor harness connection
failure
5 Document scanning position
sensor defective
6 Document pick-up roller worn
out
7 ADF motor defective
8 Main PCB defective
Error Code A4

Cover is Open

ADF cover sensor detects opened cover state.

User Check
- Close the ADF cover .
Step
1 ADF cover sensor harness
connection failure
2 ADF cover boss broken
3 ADF cover sensor defective
4 Main PCB defective
Cause
Remove foreign materials.
Set the document detection actuator into place.
Set the document scanning position actuator
into place.
Reconnect the document scanning position
sensor harness.
Replace the document scanning position
sensor PCB ASSY.
Replace the document separation roller ASSY.
Replace the ADF motor.
Replace the main PCB ASSY.
Cause
Reconnect the ADF cover sensor harness.
Replace the ADF cover.
Replace the ADF unit.
Replace the main PCB ASSY.
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Solution
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Solution
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