c Chart — Reflow Solder Defects
Twenty-six inspected panels of a fixed-area PCB assembly counted for solder defects, where a paste printer nozzle blockage produces the excursion past the upper control limit that rules 1 and 5 isolate.
Make it your own.
title "Solder defects per panel — reflow line 1, board REV-C"
chart c
unit defects
# Every panel is the same area with the same joint count, so a plain count
# chart is right: there is no denominator to divide by.
sample defects: 5
sample defects: 7
sample defects: 9
sample defects: 11
sample defects: 6
sample defects: 3
sample defects: 2
sample defects: 8
sample defects: 8
sample defects: 6
sample defects: 5
sample defects: 5
sample defects: 7
sample defects: 7
sample defects: 9
sample defects: 11
sample defects: 4
sample defects: 9
# Paste printer nozzle partially blocked over panels 19 and 20.
sample defects: 18
sample defects: 14
sample defects: 6
sample defects: 15
sample defects: 6
sample defects: 6
sample defects: 3
sample defects: 7