Document Scanning Position Sensor Detects A Document Of Which Length; Modem Communication Failure; Modem Does Not Start Normally Even After Resetting The Modem - Brother MFC-J3520 Service Manual

Error Code BF

Unable to Scan BF
Document scanning position sensor detects a document of which length is larger than
the specified size for duplex scanning.
User Check
- Check whether the document scanned is longer than the specified limit.
- Remove the jammed document.
Step
1 Document scanning position
actuator caught on the
surrounding parts
2 Document scanning position
sensor defective
3 Document feed roller worn out/
ADF motor defective
4 Main PCB defective
Error Code DF

Unable to Print DF

Modem communication failure

Error Code E0

Unable to Print E0

Modem does not start normally even after resetting the modem.

Step
1 MJ PCB harness connection
failure
2 MJ PCB defective
3 Main PCB defective
Cause
Set the document scanning position actuator
into place.
Replace the document scanning position
sensor.
Replace the ADF unit.
Replace the main PCB ASSY.
Cause
Reconnect the MJ PCB harness.
Replace the MJ PCB ASSY.
Replace the main PCB ASSY.
2-50
LCD
Solution
LCD
LCD
Solution
Confidential