Disassembly/Assembly
63
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 casting 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.
Chassis (Seal Port
and Label Seal)
To replace the Seal Port and Label Seal:
1. Remove the Label Seal that covers the Seal Port from the chassis.
2. Remove the Seal Port.
3. Ensure that the casting’s surface (at the Label Seal & Seal Port recessed) is
clean, no/minimum scratches and free from any adhesive or other foreign
materials.
4. Install a new Seal Port, covering the three vent port holes, in the small
recessed area in the casting. Ensure that no oily substance come in contact
with the seal.
5. Install a new Label Seal over the Seal Port in the larger recessed area in the
casting. Press down evenly over the label’s surface to ensure good adhesion.
Frequency Switch
and Antenna Nut
To replace the frequency switch and antenna nut:
1. Refer to Section “Front Cover from Chassis Disassembly” on page 47,
remove the chassis assembly from the radio.
2. Refer to Section “Chassis Disassembly” on page 49, remove the Main Board
from chassis.
3. Unsolder the defect Frequency switch and/or Antenna nut, and solder with
new Frequency switch and/or Antenna nut.
4. Inspect if the replacement part(s) sits properly on the Main Board, and no tilt
is allowed. This is to prevent leakage due to improper placement of
Frequency switch and Antenna nut.
5. Install a new main seal O-ring and Battery Seal (22) on the casting assembly.
6. Reassemble the chassis assembly to the radio.
7. 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 casting.
Main Seal O-ring To replace the main seal O-ring
1. Refer to Section “Front Cover from Chassis Disassembly” on page 47,
remove the chassis assembly from the radio.
2. Refer to Section “Chassis Disassembly” on page 49, remove the Main Board
from chassis.
3. Remove the main seal O-ring.
4. Inspect the seal area around the casting 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.
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