rotate smoke module knurled hold down screws counterclockwise to a loose position and pull the modulefrom its housing. Check photocell lamp. If all preceding checks prove satisfactory, replace smoke detectormodule assembly P/N 897793).k.If the smoke detector module alarm light is on intermittently without verification of a smoke source. check thedetector sensitivity voltage at TP1, TP2, referring to the detector log table recorded voltage levels in theelectronics drawer assembly.NOTEAll detector voltages are measured with a 10 Meg minimum input resistancevoltmeter.Any voltages decreasing by 20-30% require inspection and cleaning of the associated detector module andhousing assembly.l.If the common trouble lamp (L2) is on and LS through L-11 and L-16 and L-15 are off, check all connectors atthe supervisory control circuit board; check all smoke detector plug modules for proper engagement with matingconnectors.m. If the power fail lamp (L-13) is on. refer 'to step 1.7-15
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