| 摘要 |
PROBLEM TO BE SOLVED: To provide an option board detection circuit capable of efficiently checking attachment of an option board. SOLUTION: The option board detection circuit for detecting attachment/unattachment of the option board 2 to a printed circuit board, is provided with a changeover switch 1 for switching a system power supply and detection circuit, and a light emitting diode 3 corresponding to the option board 2 with one-to-one so as to be lighted when the changeover switch 1 is switched to the detection circuit power supply side. COPYRIGHT: (C)2004,JPO
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