Brother MFC740

• Code: 42
• Description: The head drive voltage has not been turned from High to Low within the specified time.

• Code: 43
• Description: The head drive voltage sticks to Low.

• Code: 44
• Description: Head thermister broken.

• Code: 45
• Description: Head thermister short-circuited.

• Code: 46
• Description: The number of performed purge sequences has reached the limit.

• Code: 4B
• Description: Abnormal carriage travel speed detected when the power was applied.