3. Ensure that the difference between the maximum and minimum fluctuation readings of the gauge
pointer remains within 0.05 inHg.
NOTE: The actual reading of the gauge pointer at this point is not important.
Figure 50: Vacuum Leak Test Setup
Compressor
Direction of air flow
Radio
Leak
Tester
4. Block the open end of the hose and adjust the leak tester so that the gauge shows 3.40 inHg.
5. Unscrew the antenna on the radio for leak test.
6. Ensure that a vacuum leak tester connector O-ring is attached to the vacuum leak tester connector.
7. Screw the connector into the antenna port and ensure that the connector is screwed properly.
8. Attach the open end of the hose to the leak text fixture.
9. Place the radio on a flat surface with the back chassis facing upward.
10. Place a few drops of water on the vent membrane that protects the seal port on the back chassis.
IMPORTANT: To prevent air leak through the seal, ensure that water covers the entire vent
membrane.
11. Start the vacuum leak test and observe the gauge for 20 seconds while the vacuum leak tester is
running.
NOTE: Maximum allowable pressure drop after 20 seconds is 0.10 inHg.
12. Allow the radio to equalize by drying the water from the membrane that protects the seal port.
13. Remove the vacuum hose and connector from the radio.
5.11.2
Hand Pump Vacuum Leak Tester Kit
The vacuum leak test is performed to ensure that the radio is IPX7 compliant. This test must be performed
after servicing the radio and before returning the radio to the customer.
The hand pump leak tester can be purchased through MSI system:
Hand Pump Vacuum Kit
NLN9839
The hand pump vacuum leak tester comes with a gauge and a vacuum hose. A connector with O-ring, which
must be ordered separately, connects the vacuum hose to the radio through the antenna port.
68015000841-EL
Chapter 5: Maintenance
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