24e7d3a5_FAQs___3M_ESPE_Suomi__Possible_Cause
[Problem] The light intensity is too low. [Solution] Clean the light guide and the protecting glass in the light guide mounting hole (Please refer to 'Cleaning the Light Guide' in the Instructions For Use). [Possible Cause] 
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FAQs - 3M ESPE Suomi
Possible Cause