Head Drive Circuit For Printer - Casio CE-300 Service Manual

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4-8. Head drive circuit for printer

Motor drive circuit
Normally, the transistor of motor drive circuit is followng condition.
When the CPU want to rotate the motor, CPU change the MD signal to "High" from "Low".
Then, TR1, TR2 and TR5 are become ON and MD (-) signal is become GND level,
and then motor is rotated.
Head drive circuit
When the CPU wants to print, CPU send "High" signal from HD.A ~ HD.H terminal.
This signal goes to printer unit, and then print.
RP: Reset pulse from printer
DP: Dot pulse from printer
TR1, TR2, TR5 : OFF
TR3, TR4 : ON
MD (-) signal : VP level
Digitized in Heiloo, Holland.
TR4 TR3
TR5
— 10 —
3/22/15
TR1
TR2