Fig. 3-15 Motor drive circuit (example)
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| Notes: Adjust motor speed with VR | |
R1 | 10 KΩ |
| TR1 | 2SA950 | ||
| adjustment and T1 signal to | |||||
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R2 | 3.3 KΩ |
| TR2 | 2SC1740 | ||
| 1660 Hz ± 30 Hz. | |||||
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R3 | 6.8 KΩ | 1/6 W | TR3 | 2SA1175 | ||
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R4 | 2.2 KΩ |
| TR4 | 2SD882 |
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R5 | 1.2 KΩ |
| TR5 | 2SB1359 |
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R6 | 10 KΩ |
| TR6 | 2SD1637 |
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R7 | 20 KΩ |
| IC1 | SN74LS05 |
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C1 | 0.47 ∝ | F (Film) | IC2 | M51971L (MITSUBISHI) |
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C2 | 0.033 ∝ F (Film) | VR | 6.8 KΩ |
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C3 | 0.022 ∝ F (Film) |
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3.8.1 FG Circuit
The motor control circuit with a Frequency Governor circuit maintains the printing speed at the settings. It is mainly constructed of a Speed Control IC (IC2) and a Power Transistor TR6 shown in Fig.
3.8.2 Merits of the FG Circuit
The FG circuit maintains a stable output regardless of the environment where it is being used. It maintains stability even at high speeds.
It protects the head because the speed is stable.
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