Reassembly; Vacuum Test - Motorola ASTRO XTSTM 2500 Basic Service Manual

Disassembly/Assembly

Reassembly

Vacuum Test

60
Do not reassemble the radio without first performing the
following preliminary inspection procedure.
C a u t i o n
To reassemble the radio:
1. Remove the main seal O-ring from the casting.
2. Inspect the seal area around the casting for foreign material that might
prevent the main seal O-ring from sealing properly.
3. Install a new main seal O-ring, discard the old O-ring.
4. Remove the Battery Seal from the Battery Connector on Main Board.
5. Inspect the Battery Connector on Main Board and surrounding areas for
foreign material that might prevent the Battery Seal from sealing properly.
6. Install a new Battery Seal; discard the old Seal.
7. Reassemble the housing.
The main seal O-ring should not be visible when looking at the
back side of the radio. If the seal is visible, it is improperly
installed.
C a u t i o n
Continue reassembling the radio according to Section "Radio Reassembly—
Detailed" on page 55. Tighten all hardware that was loosened or removed.
The vacuum test uses a vacuum pump and gauge. The pump creates a vacuum
condition inside the radio, and the gauge monitors the radio for a stable vacuum
reading; that is, checking for a properly sealed, watertight unit. Before starting the
vacuum test:
• Remove the battery
• Remove the universal connector cover to expose the universal connector.
To conduct the vacuum test:
1. Attach the vacuum hose to the vacuum pump. Check the pump and hose for
leaks by blocking off the open end of the hose and operating the pump a few
times. The actual reading of the gauge at this point is not important; it is
important that the gauge pointer remained steady, indicating no vacuum leaks
in the pump.
2. Unscrew the nut on the chassis for leak test. Remove the Base Plate Seal
using needle-nose tweezer; discard the old Base Plate Seal.
3. Ensure that a rubber gasket is attached to the hose-to-casting adapter. Screw
the adapter into the tapped hole in the casting.
4. Attach the open end of the hose to the adapter.