Check that the filters are not damaged and that they fit easily into the treatment head

For each filter in turn, fit the filter into the treatment head and check that an exposure may be made with the correct filter

For each filter check that an exposure is NOT possible with all other available filters

For each filter, check that exposure is not possible until the filter is inserted fully and correctly into the treatment head.

NEXT: Applicator Interlocks & Mechanical Checks (2.5 mins)