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A PCB assembly line consists of 3 operations: Screen the boards, Place the components and solder the components in an oven. Each operation is described
A PCB assembly line consists of operations: Screen
the boards, Place the components and solder the
components in an oven. Each operation is described
as follows Assume that Total Process Average Total Operation Nominal with a sided distribution.
Screen: Quality measured by the height of the material deposited, through a control chart
Nominal mils, USLNo lower limit provided
Control Chart : Xdouble bar : UCLX : LCLX : : Sample Size
Reject Rate PPM Yield Cp Cpk
Place: Quality measured by the defect rate obtained, using P chart with sample average assume process centered and twosided specification limit
Reject rate in PPM Yield Cp Cpk
Oven Quality measured by # solder shorts in parts, using C chart, assume process centered and two sided specification limit
Nominal short parts, C chart : Cbar UCLc LCLc
Reject Rate PPM Yield Cp Cpk
Total Process: Quality measured by all defects in the line of three machines, assume process centered and two sided specification limit
Reject Rate PPM Yield Cp Cpk
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