Brother International MP-21CDX Service Manual - Page 38

Cartridge Detection

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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. Fig. 2.10 • 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. II-8

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II-8
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.
Fig. 2.10
•
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.