EXTERIOR MICROWAVE MOTION SENSOR FAILURE (continued)

TM 5-6350-275-24&P

Table 3-9. Sensors DS Maintenance Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

9. EXTERIOR MICROWAVE MOTION SENSOR FAILURE (continued)

Step 8. Place multimeter negative lead on TB1 pin 1 and positive lead on pin 2. The multimeter should read

from +11 to +15 v.

If multimeter reading is correct, go to step 9.

If multimeter does not read between +11 and +15 v, replace input power source.

Step 9. Place multimeter negative lead on TB1 pin 9 and positive lead on Test Point TP5. The multimeter

should read between 3.5 and 5.5 vdc.

If multimeter reading is correct, replace EMMS Receiver PWA Assembly (Para. 3-116).

If multimeter reading is not correct, replace EMMS Transmitter PWA Assembly (Para. 3-116).

10. EXTERIOR INFRARED PERIMETER SENSOR FAILURE (Figure 3-19)

Step 1. Perform a walk test (per the SAIG) by entering zone of protection and monitoring LED indicator (2) on

receiver (1).

If LED indicator illuminates during walk test and goes out when zone has been cleared, sensor system is

good.

If LED is constantly illuminated, replace Receiver Infrared Sensor Assembly (Para. 3-115).

If LED does not illuminate during walk test, go to step 2.

Step 2. Remove receiver housing front cover (3). Set multimeter to read vdc and place multimeter leads

across TB1 (4) pins 1 and 2. The multimeter should read +12 v.

If multimeter reads +12 v, go to step 3.

If multimeter does not read +12 v, go to step 4.

Step 3. Remove transmitter housing front cover (6). Place multimeter leads across TB1 (5) pins 1 and 2. The

multimeter should read +12 v.

If multimeter reads +12 v, replace receiver assembly (Para. 3-115) and repeat step 1.

If LED still does not illuminate, replace transmitter assembly (Para. 3-115).

If multimeter does not read +12 v, go to step 4.

Step 4. Check for +12 v at RADC, TBK pins 3 and 4.

If +12 v is present, replace wiring between sensor and RADC.

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