Main Pcb; 1 ] Block Diagram - Brother PT-1090 Service Manual

2.2.2

Main PCB

[ 1 ] Block Diagram

Figure 2.2-2 shows a block diagram of the main PCB. The main PCB consists of the
following:
(1) CPU
(2) DC motor driver
(3) Thermal head driver
(4) Oscillation circuit
(5) Solder points
(6) Power supply circuit
(7) Key detector circuit
(8) Voltage detector circuit
(9) Temperature sensor detector
(10) LCD driver
Thermal
Thermal
print head
head driver
(64 dots
in 180 dpi)
Oscillation
circuit
Solder points
DC motor
driver
Drive motor
(DC motor)
(12 characters x 1 row,
with guidance indicators)
LCD driver
MN101EF57G
Internal ROM: 128 KB
Internal RAM:
Power supply circuit
(3-terminal regulator)
Dry cells
AC adapter
Figure 2.2-2 Block Diagram of Main PCB
LCD
CPU
Temperature
sensor detector
6 KB
Voltage detector
circuit
Key detector
circuit
Key contacts
II - 11
Main PCB
Cassette sensor
Cutter sensor
Key PCB