Carriage Motor Cannot Stop; 4000 Casing Internal Thermistor Defective; Head Voltage Does Not Turn Off; When Power Is On - Brother HL-J6000DW Service Manual

■ Error Code 3F00

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 4000
Casing internal thermistor defective
- Casing internal thermistor detects -20 degree-C or less, or 80 degree-C or more

when power is ON.

Step
1 Casing internal thermistor
defective
2 Main PCB defective
■ Error Code 4200

Head voltage does not turn 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.
Replace the main PCB.
Cause
Replace the ink refill ASSY.
Replace the main PCB.
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.
Replace the main PCB.
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Solution
Solution
Solution
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