Outline Of Control Electronics; Configuration - Brother PT-1090 Service Manual

2.2 Outline of Control Electronics

2.2.1

Configuration

Figure 2.2-1 shows a block diagram of the control electronics of this machine. The
control electronics consists of three PCBs (main PCB, key PCB and cassette sensor
PCB), an LCD, motor, thermal print head and cutter sensor.
■ Main PCB
This PCB manages all the components including an LCD, motor and thermal print
head. For electronic devices on the main PCB, refer to Section 2.2.2.
■ Key PCB
This PCB holds an AC jack.
■ LCD
The LCD is 12 characters wide by one row high and it has 17 guidance indicators.
■ Motor
The DC motor is a power source to advance tape and ink ribbon.
■ Thermal print head
This is a thick-film thermal print head which integrates a heat generator (consisting of
64 heating elements vertically aligned in 180 dpi) and driver circuitry.
■ Cassette sensor PCB
According to the states of the four sensor switches on this sensor, the CPU can
identify the tape width and type of the tape cassette loaded.
■ Cutter sensor
Pressing the cutter lever turns on this sensor, signaling that the cutter is driven. If this
sensor is turned on during printing or tape feeding, the CPU immediately stops the
motor to prevent tape jamming.
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