VR
4069UB
820p
2SC
1740
150k
Ω
50k
Ω
22k
Ω
22k
Ω
22k
Ω
100k
Ω
1SS133
Oscillator output
Oscillator output
Print pulse width
1 2 3 4 5
1819 20
Head drive signal (Example: 20-pulse count)
* The compensation circuits for temperature and voltage are included.
* Adjust an oscillating frequency with VR to obtain the proper pulse width in 20 counts
at the normal temperature.
* A print pulse width is made by counting the above oscillator output with the CPU.
Figure 2-10 Sample Pulse Width Control Circuit
2.6.5 Initialization
Feed out the paper by one line and stop the print head at the home position after turning on the power.
2.6.6 Paper Feeding
Paper is fed automatically upon input of a motor drive signal. After paper is fed, the head must stop
always at the home position.
2-14
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