| 摘要 |
PROBLEM TO BE SOLVED: To avoid using another constitution or requiring high dimensional precision, to avoid causing the dimensional increase of an interface and to reduce a cost without changing constitution on the side of a signal unit. SOLUTION: An insertion preventing piece 6a is obtained by extending a part of a reinforcing member 6 for reinforcing fitting of a back board 1 to a shelf 5 in the state of a flat piece for blocking the insertion of the connector 4 of a printed board 3 to a power connector 2a, and a recessed groove 7 is provided only at the board 3 of a power unit 3a for avoiding contact with the piece 6a. Second slots 14 and 15 are provided in the shapes of grooves for guiding the insertion of the upper/lower edges of the radiation panel 8 of the unit 3a only to a site to which the unit 3a of the opening part 5a of the shelf 5 has to be inserted. Thus, signal units 3b are prevented from being inserted erroneously to the connector 2a, and the unit 3a is prevented from being inserted erroneously to a signal connector 2b.
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