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2.2.2
Main PCB
Block Diagram
[ 1 ]
Figure 2.2-2 shows a block diagram of the main PCB.
The main PCB consists of the following:
(1) CPU (including a ROM and RAM)
(2) LCD driver
(3) Key contacts and solder points
(4) ON/OFF key and its circuit
(5) Thermal head drive circuit
(6) Oscillation circuit
(7) Voltage detection circuit
(8) Power supply circuit
(9) Motor drive circuit
(10) Dial position detection circuit
Figure 2.2-2 Block Diagram of Main PCB
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Troubleshooting
