EXTERIOR MICROWAVE MOTION SENSOR FAILURE

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 (Figure 3-18)

NOTE

If either transmitter or receiver assembly is replaced, mark location where assembly was mounted on steel

pole. Perform Radio Frequency Microwave Sensor AGC alignment procedure. (See SAIG, Appendix E,

Section 9)

Step 1. Go to receiver assembly (3) and open receiver compartment door (4).

Step 2. Check to ensure power on lamp DS3 (6) is illuminated. If DS3 is illuminated, go to step 5.

If DS3 is not illuminated, go to step 3.

Step 3. Remove input power and check for a blown fuse F1 (7).

CAUTION

The silk-screen on the PWA is labeled . 1 amp fuse. The actual size is .25 amp, 250 vac.

If fuse is blown, replace fuse and reconnect input power. If lamp is still not lit, go to step 4.

Step 4. Set multimeter to read + vdc. Place negative (black) lead on TB1 pin 1 and positive (red) lead on TB1

pin 2. The multimeter should read +12 v.

If multimeter reading is correct, go to step 5.

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

Step 5. Perform a walk test (per the SAIG) and check LED alarm indicator lamp (5). It should be lit.

If LED alarm indicator does not illuminate, go to step 6.

Step 6. Go to EMMS transmitter unit (1) and open front panel door (2). Check power on LED (8) DS1 for

a power on indication.

If power on LED is not lit, to step 7.

If power on LED is lit, go to step 8.

Step 7. Check for blown fuse (9) on Transmitter Board.

CAUTION

The silkscreen on the PWA is labeled . 1 amp fuse. The actual size is .25 amp, 250 vac.

If fuse is blown, replace fuse.

If fuse is not blown, go to step 8.

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