Brother MFC-J6935DW - Head Voltage Does Not Raise; 4 C01 Compound IC Thermistor Error; The Compound IC Thermistor Detected a Temperature of -21 Degree-C or; ASIC Thermistor Error

Confidential
2-39
■ Error Code 4900
Head voltage does not raise.
< User Check >
- They may occur due to lower surrounding temperature. Use in warmer surrounding
temperature.
■ Error Code 4C00
ASIC thermistor error.
- The ASIC thermistor detected a temperature of -21 degree-C or less, or 125
degree-C or greater, when the machine was turned on.
Error Code 4C01
Compound IC thermistor error.
- The compound IC thermistor detected a temperature of -21 degree-C or less, or
125 degree-C or greater, when the machine was turned on.
■ Error Code 4E00
Head voltage remains ON and does not turn OFF even after 15 minutes have
passed.
Step Cause Solution
1 Head flat cable connection
failure
Reconnect the head flat cable.
2 Carriage flat cable connection
failure
Reconnect the carriage flat cable.
3 Carriage PCB defective Replace the carriage PCB ASSY.
4 Head defective Replace the head/carriage unit.
5 Power supply PCB defective Replace the power supply PCB.
6 Main PCB defective Replace the main PCB.
Step Cause Solution
1 Head flat cable connection failure Reconnect the head flat cable.
2 Carriage flat cable connection
failure
Reconnect the carriage flat cable.
3 Carriage PCB defective Replace the carriage PCB ASSY.
4 Head defective Replace the head/carriage unit.
5 Power supply PCB defective Replace the power supply PCB.
6 Main PCB defective Replace the main PCB.
Step Cause Solution
1 Carriage PCB defective Replace the carriage PCB ASSY.
2 Head defective Replace the head/carriage unit.
3 Main PCB defective Replace the main PCB.