C B C C D E C C B A D A C C C B C A C D C A C C B A C A C B C C A C A A C C D A C C C E C C A B A C a. Prepare a tally sheet (or checklist) of the different reasons for rejection. b. Develop a Pareto chart to identify the more significant types of rejection. c. Examine the causes of the most significant type of defect, using a cause-and-effect diagram.
At Conner Company, a custom manufacturer of printed
circuit boards, the finished boards are subjected to a final
inspection prior to shipment to its customers. As Conner’s
quality assurance manager, you are responsible for making a presentation to management on quality problems at the be-
ginning of each month. Your assistant has analyzed the reject
memos for all the circuit boards that were rejected during the
past month. He has given you a summary statement listing
the reference number of the circuit board and the reason for
rejection from one of the following categories:
A = Poor electrolyte coverage
B = Improper lamination
C = Low copper plating
D = Plating separation
E = Improper etching
For 50 circuit boards that had been rejected last month, the
summary statement showed the following:
C B C C D E C C B A D A C C C B C A C D C A C C B
A C A C B C C A C A A C C D A C C C E C C A B A C
a. Prepare a tally sheet (or checklist) of the different reasons
for rejection.
b. Develop a Pareto chart to identify the more significant
types of rejection.
c. Examine the causes of the most significant type of defect,
using a cause-and-effect diagram.
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