Head Voltage Fails To Be Turned Off - Brother MFC-J3520 Service Manual

Error Code 3F

Unable to Print 3F
Carriage motor cannot stop.
Step
1 Carriage motor harness
connection failure
2 CR encoder strip stained
3 CR encoder strip defective
4 CR encoder sensor defective
5 Carriage motor defective
6 Main PCB defective
Error Code 40

Unable to Print 40
Casing internal thermistor defective
Casing internal thermistor detects -20 °C or less and 80 °C or more when power is ON.
Step
1 Casing internal thermistor
defective
2 Main PCB defective
Error Code 42

Unable to Print 42

Head voltage fails to be turned OFF.

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
Cause
Reconnect the carriage motor harness.
Clean the CR encoder strip.
Replace the CR encoder strip.
Replace the carriage PCB ASSY.
Replace the carriage motor ASSY.
Replace the main PCB ASSY.
Cause
Replace the ink cartridge PCB ASSY.
Replace the main PCB ASSY.
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.
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Solution
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Solution
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Solution
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