| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to purchase stepping motor driving ICs which have no compatible ones from more than two manufacturers by providing two types of lands so that two types of stepping motor driving ICs may be mounted on a substrate used for a control unit. SOLUTION: Lands 1, 2 are provided for stepping motor driving ICs, and motor current supply lines to both stepping motor driving ICs 4 are provided commonly for lines 3 to supply current to a motor. In addition, a land 6 is cut in the center, one half 7 of which is connected to a controller and the other half 8 to a power supply, the land 7 is pulled down by a resistor 9, when a stepping motor driving IC 4 is loaded, the voltage of the land 7 becomes equal to the power supply voltage supplied to the land 8 and if an IC 11 is loaded on the land 1, the voltage of the land 7 becomes ground voltage, making the detection of a stepping motor driving IC to be loaded. |
