| 摘要 |
PROBLEM TO BE SOLVED: To make a display unit easily exchangeable. SOLUTION: A connector 36 of a connecting member 35 of the maintenance tool 31 is inserted into a connector 37 of the display unit 12 and the display unit 12 is removed from a mounting plate 21. The display unit 12 is lowered down onto the ground by letting off a reel 34. Next, another display unit 12 is attached to the connecting member 35 on the ground and the reel 34 is unwound to lift the display unit 12 up to a desired position. The display unit 12 is fixed from the inside of the display device.
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