5-42 Disassembly/Reassembly Procedures Ensuring Radio Immersibility
Troubleshooting Flow Chart for Pressure Test & Leakage Areas
Start 
1. Remove vacuum hose from  
pump connector 
2. Attach pressure hose to 
pump connector 
1. Operate pressure pump  
(pressure = 1 psig)
2. Immerse radio into a water- 
filled container 
Continuous  
Series of  
bubbles 
YES 
NO 
Bubbles from  
Front  
Housing 
YES 
NO 
Bubbles from  
Chassis 
YES 
NO 
Bubbles from  
Battery Con- 
tact Seal 
YES 
NO 
Bubbles from  
Lens*/Univer- 
sal Connector/   
chassis/  
Housing Inter- 
face/ PTT  
1. Dry the radio
2. Apply grease to the full 
perimeter of the chassis O-Ring
and replace Chassis Kit and 
repeat steps in Troubleshooting
Flow Chart for Vacuum Test
YES 
1. Remove Knobs 
NO 
1. Dry the radio 
2. Replace Battery Contact Seal,
Apply grease to the full 
perimeter of the chassis O-Ring
and replace Chassis Kit. Repeat 
steps in Troubleshooting Flow Chart
for Vacuum Test 
1. Dry the radio 
2. Apply grease to the full 
perimeter of the chassis O-Ring
and replace Chassis Kit and 
repeat steps in Troubleshooting
Flow Chart for Vacuum Test
1. Dry the radio 
2.Replace
Ventilation Label and
Ventilation Seal
3. Radio approved 
for immersibility
* Only for Display Model 
End End End End End