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  • 1.
    Andersson, Mikael
    et al.
    Linköping University, Department of Management and Engineering, Production Economics.
    Bohman, Marcus
    Linköping University, Department of Management and Engineering, Production Economics.
    Effektivisering av produktionsflöde: Införande av ny teststrategi2009Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Ericsson AB in Katrineholm is a part of the Section Business Unit Network in the Ericsson Group. The plant's main task is to produce printed circuit boards in small volumes with a high product mix and focus on delivery and cost effectiveness. At the factory they produce printed circuit boards in the Module department.

    The Module department has for a long time had a high output of non-approved circuit boards in their production. This has led to a growing stock of non-approved circuit boards on the company’s repair department.

    The purpose of this thesis is to investigate how Ericsson in Katrineholm can increase the outflow of approved articles in their test process in the Module department. As a basis for drawing up proposals, a study of the production in the form of value flow maps was conducted. Information was collected from the various databases QSP, Testnet and C:M. Information was also gathered by informal interviews. The company's present situation has been studied using theories like flow time and utilization rates and from the collected information, proposals have been developed using the program Excel and C #.

    Analysis of the present situation revealed that the test strategy that they now are using is not working well enough, because printed circuit board that does not have any defects is sent to the repair department. The fact that the test stations are very unstable and that the test operators do not possess enough knowledge of each article is also factors causing non-defect products to be sent to the repair department.

    The report presents a new test strategy based on 5 different criteria on data gathered from the database SID 40 days back. Complementary information is also presented to the test operators to facilitate their work when it comes to making decisions if a card / unit will be tested again. By introducing the new test strategy a value of 1.6 for cards and 3.25 for units of million Swedish crowns would be sent directly to customer instead of being sent to the repair department. However, this would increase the utilization of the resources, by 9.2 % for cards and by 19.2 % for units, but the utilization is very low, which implies that it should not affect the system in largely. However, this requires that the test process is performing in the same way as it did the last 40 days.

    Finally the results are presented in a graphical interface to facilitate the operators in the Module department. The recommendations given to Ericsson regarding the new test strategy is that it should be used as a tool at first and if the latter is used it should be integrated into the regular test environment.

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