Troubleshooting Leak Areas - Motorola ASTRO XTS 5000 I Basic Service Manual

Disassembly/Reassembly Procedures
Troubleshooting
Leak Areas
56
Pressure any greater than 1 psig may push air around the
!
main seal.
C a u t i o n
6. Maintain the pressure at 1 psig and submerge the radio into a
water-filled container. Keep the vent port covered with your
thumb while the radio is submerged.
7. Watch for any continuous series of bubbles. A stream of bubbles
indicates a sign of leakage.
NOTE: Some air entrapment may cause the accumulation
of bubbles, especially in the grille area, but the
bubbles should not be continuous.
8. Note all of the seal areas that show signs of leakage. Pinpoint the
problem(s) to one (or more) of the following areas:
• Housing
• Antenna bushing seal
• Controls seal
• Frequency switch, toggle, and on/off/volume control switch
• Main seal
• Battery contact and battery contact seal
• Keypad
9. Remove the radio from the water container, remove your thumb
from the vent port seal, and dry the radio thoroughly. Be
especially careful to dry the area around the main seal to prevent
contamination of the internal electronics while the unit is open.
To avoid equipment damage, keep the area around the port
!
seal dry by ensuring that there is no water around the
casting's vacuum port.
C a u t i o n
10. Remove the adapter and pressure hose added in steps 1 and 2,
above.
11. Install the vacuum test port plug by pressing it in, ensuring that
the plug sits flat all around the edges and it is flush with the
casting.
12. Inspect the vent port seal (61) to ensure that the seal behind the
label's (62) two slots has not been punctured. If it has been
punctured, the seal and the label must be replaced.
Before repairing any leak, read all applicable area repair paragraphs.
This will help to eliminate unnecessary disassembly and reassembly of
a radio with multiple leaks. Troubleshoot only the faulty seal areas
listed in "Pressure Test" on page 55, and, when multiple leaks exist, in
the order listed.
NOTE: Before reassembling the radio, always install a new
main seal o-ring, and new seals in the defective area.