Canon BJC 50 Service Manual - Page 121
Canon BJC 50 - Color Inkjet Printer Manual
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BJC-50 3.5.2 Carriage section structure Part 4: Technical Reference a) BJ cartridge mounting section The BJ cartridge is fixed to the carriage by the carriage contact spring. When the BJ cartridge is mounted on the carriage, the contacts of the carriage ribbon cable connect with the signal contacts of the BJ cartridge to transfer printing signals sent from the control board. There are wiping hooks that set and release the wiper on the back of the carriage. There also is a home position edge that shields the home position sensor on the chassis on the back of the carriage. b) Carriage drive section The power from the stepping type carriage motor moves the carriage horizontally with the carriage belt. After the home position sensor attached to the rear of the carriage detects the home position edge, the carriage is controlled with the stepping pulses transmitted to the carriage motor. The pulses driving the carriage motor are controlled by the MPU section to have the optimum pulse width. (PWM control) This reduces the operating noise. Also, if the print position is shifted mechanically, it is corrected automatically, the home position sensor detects the home position edge on the carriage, and the print start position is shifted with software. This adjustment is conducted when the initial operation is performed after the printer is powered on by the POWER button, or when the printing operation is performed after the print mode is changed. Carriage Ribbon Cable Home Position Edge Contact Point Carriage Belt Cartridge Lock Hook Wiping Hooks Figure 4-25 Carriage Section Structure 4-33