| 摘要 |
PURPOSE:To provide a method of easily and accurately checking an electronic part on a board. CONSTITUTION:Marks (a), (b), and (c), hidable under electronic parts, are provided near the center of conductor patterns A, B, and C on a board 1, and then electronic parts 5, 6, and 7 are mounted on the board 1. Therefore, if the electronic part 6 falls off and the mark (b) is exposed, it is found that the conductor pattern B lacks the electronic part 6. |
