Fluke Networks CertiFiber Pro Users Manual - Manual (Page 169)

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Chapter 6: How to Clean Fiber
Endfaces
When a fiber optic link does not operate correctly, the cause is
frequently a dirty endface in a connector. Figure 70 shows
examples of dirty endfaces and an endface that has been correctly
cleaned and polished.
GPU36.EPS
Figure 70. Examples of Clean and Dirty Fiber Endfaces
Cleaned and polished correctly Wiped on a shirt
Dirty connector on
a patch cord
Contamination that remains
after alcohol dries