求翻译：质量保证期内，在用户按照设备使用说明书的要求正常使用的前提下，设备出现任何故障，卖方应在接到用户书面通知后3日内免费派遣工程师到达用户工厂进行维修。若卖方不能排除故障，用户可追加赔偿。是什么意思？

Quality assurance period, the user manual of the equipment requirements of the normal use of the premise, equipment, any failure, the seller should, upon written notice to the user free of charge within 3 days after the dispatch of engineers to reach the user factory for repair. If the seller can no

quality guarantee period, in accordance with the user specification of the equipment used for normal use, and equipment under the premise that the seller should any defect in 3 days after receiving written notice users free users send engineers arrived plant for maintenance. If the seller cannot be

In the quality maintenance, in the user under the premise which uses normally according to the equipment instruction for use request, the equipment appears any breakdown, the seller should in receive the user written notification latter in 3rd free to dispatch engineer to arrive the user factory to

Quality guarantee period, the normal use of the user as requested by the device user's manual under the premise of, any failure equipment, seller shall, after receiving written notice free dispatch engineer at the user in the 3rd factory for repair. Cannot be ruled out if the seller fails, user can

In the quality maintenance, in the user under the premise which uses normally according to the equipment instruction for use request, the equipment appears any breakdown, the seller should in receive the user written notification latter in 3rd free to dispatch engineer to arrive the user factory to