Technical Manual
Table Of Contents
- Vocoder and Controller Boards Detailed Theory of Operation
- Introduction to This Section
- General
- Vocoder Board
- Controller Board
- Switching Regulator
- RX Signal Path
- TX Signal Path
- Controller Bootstrap and Asynchronous Buses
- Vocoder Bootstrap
- SPI Bus Interface
- Universal Connector and Option Selects
- Keypad and Display Module
- Controls and Control Top Flex
- Controller Memory Map
- Vocoder Memory Map
- MCU System Clock
- DSP System Clock
- Radio Power-Up/ Power-Down Sequence
- Notes
- Secure Modules
- Disassembly/Reassembly Procedures
- Troubleshooting Procedures
- Troubleshooting Charts
- Troubleshooting Waveforms
- Troubleshooting Diagrams
8-11
15. Inspect the main seal for proper seating. Observe carefully to
ensure that the main seal o-ring is not pinched between the
housing and the casting.
Main Seal 1. Referring to the Disassembly/Reassembly Procedures, remove the
housing assembly from the radio.
2. Remove and discard the main seal.
3. Inspect the housing and casting seal surfaces for debris or damage.
Remove any debris and replace the housing or casting if damaged.
4. Install a new main seal o-ring around the casting assembly.
5. Reassemble the housing assembly to the radio.
6. Inspect the main seal for proper seating. Observe carefully to
ensure that the main seal o-ring is not pinched between the
housing and the casting.
Battery Contact and
Battery Contact Seal
1. Referring to the Disassembly/Reassembly Procedures, remove the
housing assembly from the radio.
2. Completely disassemble the casting assembly.
3. Remove and discard the leaking component.
4. Inspect the casting seal surface for debris or damage. Remove any
debris and replace casting if damaged.
5. Install a new battery contact and a new battery contact seal if
necessary.
When installing the battery contact seal,
make sure that the ledge around the
outside of the seal completely protrudes
through the opening in the casting and
sits flush with the outside surface of the
casting. Also, make sure that the seal’s shape is not
distorted.
6. Reassemble the casting assembly.
7. Install a new main seal o-ring around the casting assembly.
8. Reassemble the housing assembly to the radio.
9. Inspect the main seal for proper seating. Observe carefully to
ensure that the main seal o-ring is not pinched between the
housing and the casting.
Keypad 1. Referring to the Disassembly/Reassembly Procedures, remove the
housing assembly from the radio.
2. Remove and discard the keypad.
3. Inspect the housing seal surface for debris or damage. Remove any
debris and replace housing if damaged.
4. Install new keypad.
5. Install a new main seal o-ring around the casting assembly.
6. Reassemble the housing assembly to the radio.
7. Inspect the main seal for proper seating. Observe carefully to
ensure that the main seal o-ring is not pinched between the
!
C a u t i o n
Seal Ledge
Casting