rotate smoke module knurled hold down screws counterclockwise to a loose position and pull the module
from its housing. Check photocell lamp. If all preceding checks prove satisfactory, replace smoke detector
module assembly P/N 897793).
k.
If the smoke detector module alarm light is on intermittently without verification of a smoke source. check the
detector sensitivity voltage at TP1, TP2, referring to the detector log table recorded voltage levels in the
electronics drawer assembly.
NOTE
All detector voltages are measured with a 10 Meg minimum input resistance
voltmeter.
Any voltages decreasing by 20-30% require inspection and cleaning of the associated detector module and
housing 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 at
the supervisory control circuit board; check all smoke detector plug modules for proper engagement with mating
connectors.
m. If the power fail lamp (L-13) is on. refer 'to step 1.
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