Canon Color Bubble Jet BJC-4400 Series Service Reference Manual page 6

I. MAJOR CHANGES
BJC-4400 contains the following modifications compared to BJC-4300.
1.1 PRODUCT SPECIFICATIONS
1. Faster throughput speed(especially in HS mode)
2. T-shirt Transfer (TR-201) added as media type
1.2 PRINTER MECHANICAL SYSTEM
1. Countermeasures for quality improvements to the current model were incorporated
Shape changes : Carriage, paper delivery guide, platen and bottom case
Additional changes : Increased area and amount of grease application
1.3 PRINTER ELECTRICAL SYSTEM
1. To improve throughput speed, the carriage motor, the paper feed motor and the motor driver were
modified.