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
8-10
7. Using a pair of needle nose pliers, unsnap the left snap of the
controls bracket assembly.
8. Remove the controls bracket assembly.
9. Remove and discard the controls seal.
10. Inspect the housing seal surfaces for debris. Remove any debris.
11. Install a new controls seal.
12. Install a new main seal o-ring around the casting assembly.
13. Reassemble the controls bracket assembly.
14. Referring to the Basic Service Manual (68P81089C80), Chapter 6,
install the frequency knob, new frequency escutcheon, new
frequency insert, secure lever, lightpipe, volume knob, new
volume insert, and o-ring.
15. Reconnect the controls flex to the universal connector and the
PTT area of the housing assembly.
16. Reassemble the housing assembly to the radio.
17. 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.
Frequency Switch,
Toggle, and On/Off/
Volume Control Switch
1. Referring to the Disassembly/Reassembly Procedures, remove the
housing assembly from the radio.
2. Remove the speaker bracket screw.
3. Remove the speaker bracket.
4. Disconnect the controls flex from the universal connector.
5. Disconnect the controls flex and backer from the PTT area of the
housing assembly.
6. Referring to the Basic Service Manual (68P81089C80), Chapter 6,
remove the frequency knob, frequency insert, secure lever,
lightpipe, volume knob, volume insert, and
o-ring.
7. Using a pair of needle nose pliers, unsnap the left snap of the
controls bracket assembly.
8. Remove the controls bracket assembly.
9. Replace the switch that leaks by following the unsoldering and
replacement instructions contained in the new switch’s
instruction sheet.
10. Reassemble the controls bracket assembly.
11. Referring to the Basic Service Manual (68P81089C80), Chapter 6,
install the frequency knob, new frequency escutcheon, new
frequency insert, secure lever, lightpipe, volume knob, new
volume insert, and o-ring.
12. Reconnect the controls flex to the universal connector and the
PTT area of the housing assembly.
13. Install a new main seal o-ring around the casting assembly.
14. Reassemble the housing assembly to the radio.