Head Voltage Drops Too Quick; The Purge Cam Switch Is Not Switching On/Off - Brother MFC-J3520 Service Manual

Error Code 4F

Unable to Print 4F

Head voltage drops too quick.

User Check
- They may occur due to lower surrounding temperature. Use in warmer surrounding
temperature.
Step
1 Head flat cable connection
failure
2 Carriage flat cable connection
failure
3 Carriage PCB defective
4 Head defective
5 Power supply PCB defective
6 Main PCB defective
Error Code 50

Unable to Print 50

The purge cam switch is not switching ON/OFF.

User Check
- Remove the jammed paper in platen part.
Step
1 Foreign materials in the
maintenance unit
2 Purge cam switch harness
connection failure
3 Paper feed motor defective
4 PF encoder sensor defective
5 Maintenance unit defective
6 Main PCB defective
Cause
Reconnect the head flat cable.
Reconnect the carriage flat cable.
Replace the carriage PCB ASSY.
Replace the head/carriage unit.
Replace the power supply PCB ASSY.
Replace the main PCB ASSY.
Cause
Remove foreign materials.
Reconnect the purge cam switch harness.
Replace the paper feed motor.
Replace the PF encoder sensor PCB ASSY.
Replace the maintenance unit.
Replace the main PCB ASSY.
2-36
LCD
Solution
LCD
Solution
Confidential