TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
52.
LOW AIR-PRESSURE BUZZER DOES NOT WORK.
WARNING
Although KEY SWITCH must be on and battery ground cable connected to test
electrical circuit voltage, turn off KEY SWITCH and disconnect battery ground
cable before doing resistance tests or replacing parts. This will keep you from
getting shocked and prevent damage to parts and equipment.
NOTE
Scrape painted surfaces to bare metal before connecting test leads to ensure
correct multimeter readings.
Step 1.Remove instrument panel pad (page 2-424). Set multimeter to 20 vdc scale. Connect red
test lead to input terminal (1) on low air pressure buzzer (2) and black test lead to ground. Have
assistant rotate KEY SWITCH (3) clockwise to on position. Check for 11 to 13 vdc on multimeter.
Have assistant rotate KEY SWITCH (3) counterclockwise to off position. Disconnect test leads.
a.
If multimeter reads 11 to 13 vdc, go to step 2.
b.
If multimeter does not read 11 to 13 vdc, go to step 3.
Step 2.Set to 20 vdc scale. Connect red test lead to output terminal (4) on low air pressure buzzer
(2) and black test lead to ground. Have assistant rotate KEY SWITCH (3) clockwise to on
position. Check for 11 to 13 vdc on multimeter. Have assistant rotate KEY SWITCH (3)
counterclockwise to off position. Disconnect test leads.
a.If multimeter does not read 11 to 13 vdc, replace low air-pressure buzzer (2) (page
2-709).
b.
If multimeter reads 11 to 13 vdc, go to step 4.
Step 3.Set multimeter to 20 vdc scale. Connect red test lead to output terminal (5) on KEY
SWITCH (3) and black test lead to ground. Rotate KEY SWITCH (3) clockwise to on position and
check for 11 to 13 vdc on multimeter. Rotate KEY SWITCH (3) counterclockwise to off position.
Disconnect test leads.
If multimeter reads 11 to 13 vdc, 40 wire (6) must be replaced. Notify Direct Support
Maintenance.
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