| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of disposing a voltage converting device for generating a plurality of power supplies on a control board while preventing a temperature rise and increase in the size of the control board. SOLUTION: A first power supply with a first voltage is output to a display control board 130 from a power supply board 100 via a put-out control board 140, a main control board 110 and a subordinate control board 120. The voltage converting device 50, having a first voltage converting circuit for converting the input first power supply with the first voltage to a second power supply with a second voltage and outputting the converted power supply and a second voltage converting circuit for converting the second power supply with the second voltage output from the first voltage converting circuit to a third power supply with a third voltage, is disposed on the display control board 130. COPYRIGHT: (C)2008,JPO&INPIT
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