Motorola EX500 Basic Service Manual page 47

Ensuring Radio Immersibility
c. Install a new main seal O-ring around the chassis assembly.
d. Install a new housing assembly to the radio.
e. Inspect the main seal for proper seating.
f. Observe carefully to ensure that the main seal O-ring is not pinched between the
housing and the chassis interface.
2. If the leak occurs at the control top area, remove the knobs and antenna in order to determine
the leak location:
a. Conduct the Pressure Test.
b. Identify the leak location.
3.15.11.2 Chassis (Main Seal O-ring)
To replace the main seal O-ring:
1. Refer to Section 3.13.1 "Front Cover from Chassis Disassembly" on page 3-19, remove the
chassis assembly from the radio.
2. Refer to Section 3.13.2 "Chassis Assembly Disassembly" on page 3-21, remove the Main
Board from chassis.
3. Remove the main seal O-ring.
4. Inspect the seal area around the chassis for foreign material that might prevent the main seal
O-ring from sealing properly.
5. Assemble a new O-ring; discard the old O-ring.
6. The O-ring is installed from the bottom of chassis, and ensure the O-ring sits inside the
chassis groove.
7. Reassemble the chassis assembly followed by installing into Front Cover. (Refer to Section
3.14 "EX560•XLS Radio Reassembly — Detailed" on page 3-24.)
8. Inspect the main seal O-ring for proper seating. Observe carefully to ensure that the main
seal O-ring is not pinched between the housing and the chassis.
NOTE When installing the assembled chassis to the Front Cover, ensure the O-ring at the top two
corners are not dislodged from the chassis groove.
3.15.11.3 Battery Contact Seal
To replace the Battery Contact Seal:
1. Refer to Section 3.13.1 "Front Cover from Chassis Disassembly" on page 3-19, remove the
chassis assembly from the radio.
2. Refer to Section 3.13.2 "Chassis Assembly Disassembly" on page 3-21, remove the Main
Board from chassis.
3. Remove the Battery Contact Seal from the Battery Contact on Main Board.
4. Inspect the Battery Contact Seal on Main Board and surrounding areas for foreign material
that might prevent the Battery Contact Seal from sealing properly.
5. Install a new Battery Contact Seal; discard the old Seal.
6. Replace a new main seal O-ring; discard the old O-ring.
7. Reassemble the chassis assembly followed by installing into Front Cover. (Refer to Section
3-29