| 摘要 |
PROBLEM TO BE SOLVED: To ensure maintenance suppressed in cost increase in a circuit board having interfaces connected demountably with another equipment. SOLUTION: There are provided an interface 114a for electrically connecting a circuit and external equipment by being physically connected to the external equipment electrically connected to the circuit, and a preliminary interface 114b connected in series to the interface 114a between the circuit and the interface 114a for functioning instead of the interface 114a by removing the interface 114a. COPYRIGHT: (C)2005,JPO&NCIPI
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