An optical disk apparatus according to the invention comprises a housing, a tray retractably mounted in the housing, and a bezel 10 adapted to close an opening of the housing 2 when the tray is accommodated in the housing 2. An electrically conductive metallic member 15 is disposed in at least one of main flat portions in the bezel 10. When the tray is accommodated in the housing, at least one surface of the conductive metallic member 15 is in contact with the housing.

 
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> Diagnostic system for a data acquisition system

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