(2)  
Alarm indicator lamp (red) that illuminates when smoke is detected.

 (3)  
Power indicator lamp (green) which is illuminated when power is present.

 (4)  
Power/reset switch used to interrupt alarm indications and reset smoke sensing circuit after smoke has been cleared from lavatory.

 2.  Operation (Fig. 2)
_________
 A.  Functional Description
 (1)  Lavatory smoke detectors use an ionization sensor to detect smoke. A very small amount of radioactive material ionizes the air between two electrodes allowing current to flow through the air between the electrodes. Any smoke particles present interfere with this current flow. The change in current flow is sensed by a current amplifier which outputs a signal to turn on the alarm horn and red alarm light.
 NOTE: THE LAVATORY SMOKE DETECTOR MAY NOT BE TRIGGERED BY CIGARETTE
____
 SMOKE.

 (2)  The presence of smoke is indicated by the following:
 (a)  
Alarm lamp (red) on smoke detector face panel illuminates.

 (b)  
Smoke detector alarm horn sounds.

 (c)  
Alarm indications are interrupted by pressing the power/reset switch with a small screwdriver or other suitable tool.

 B.  Control
 (1)  The following lavatory smoke detectors are powered by the left and right 28v dc bus located on overhead circuit breaker panel P11:
 (a)  
11N8, PASS CALL/LAV SMOKE LEFT

 (b)  
11N9, PASS CALL/LAV SMOKE RIGHT

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A 757 MAINTENANCE MANUAL
LAVATORY

LAVATORY (EXAMPLE)
POWER INDICATOR (GREEN)

LAVATORY SMOKE DETECTOR

A

Lavatory Smoke Detector
Figure 1

E48252
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757
MAINTENANCE MANUAL

LAVATORY MODULE (EXAMPLE)
Lavatory Smoke Detection Schematic (Example)
Figure 2

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757
FAULT ISOLATION/MAINT MANUAL

LAVATORY SMOKE DETECTION

* SEE THE WDM EQUIPMENT LIST
Lavatory Smoke Detection - Component Index
Figure 101

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E48161
A
757 FAULT ISOLATION/MAINT MANUAL
LAVATORY
ALARM INDICATOR (RED)

A

Lavatory Smoke Detection - Component Location
Figure 102

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757 MAINTENANCE MANUAL
 LAVATORY SMOKE DETECTION - ADJUSTMENT/TEST
__________________________________________
 1.  General_______
　
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