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适用于:GD-QZ330/GD-450C/GD-450V+/GD-450VS+/GD-4605K/GD-480HC/GD-670HC/GD-670HP/GD-4806EX/GD-5508EX/GD-6508PX A、检查限位感应器是否能感应 B、检查主板和限位感应器中间的连接线是否有虚接或者是线断等情况 C、检查主板继电器有没有吸合没弹开