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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 3 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 2-sided distribution.
Screen: Quality measured by the height of the material deposited, through a control chart
Nominal ,10,mils, USL_12,No lower limit provided
Control Chart : Xdouble bar : 10.1, UCLX : 11.1, LCLX : 9.1 : Sample Size 4
Reject Rate ____________%,_________PPM, Yield _____________% Cp ________, Cpk___________
Place: Quality measured by the defect rate obtained, using P chart with sample average =100, assume process centered and two-sided specification limit
Reject rate __1 in 2,000,____%,_____ PPM, Yield _____________%, Cp________, Cpk___________
Oven Quality measured by # solder shorts in 10,000 parts, using C chart, assume process centered and two- sided specification limit
Nominal ___8 short/10,000 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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