Cartridge Detection - Brother MP-21C Service Manual

2.3.5

Cartridge Detection

The detection switch is on the Cartridge PCB and detects the placement of each
cartridge separately. The detection signal is at a low level when a cartridge is fitted.
ACTRG and BCTRG are signals indicating the cartridges are fitted.
SIN0-P, SIN1-P, SIN2-P, and SIN3-P are drive data (serial data) signals to the head
driver.
HCLK-P and HSTB-P are the clock and shift signals of the drive data signals.
HVDD is a head driving power supply voltage and is variable according to the output
of the thermistor (HDTHM-P signal) on the Head PCB.
FIRE0-N, FIRE1-N, FIRE2-N, and FIRE3-N are signals setting the timing to apply the
head driving voltage to the head actuator. VDD1 is a signal indicating 5V to the head
driver and its state is controlled by the CPU according to the H5VCNT signal.
Fig. 2.10
II-8