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
8-3
Reassembly
1. Reinstall the B+ assembly (52) and B+ seal (53), making sure that
the seal seats properly in the casting assembly. Inspect the B+
assembly from the back of the casting to ensure that the seal
shows evenly around the B+ assembly.
2. Make sure that a thermal pad (61) is attached to the casting. If it is
not, attach a new thermal pad to the casting as indicated in the
exploded view.
3. With the front of the radio facing upward, drop the RF board (51)
in place, tucking the right side of the board in first — under the
casting ledge.
4. Plug the coaxial cable’s connector (55) into the RF board’s (51)
surface-mount connector, making sure to lead the coax’s
connector in on an axis straight into the surface-mount connector.
An angled lead-in can damage the surface-mount connector or the
center of the coax.
5. Reinstall the RF shield (49). Insert the shield’s top edge in first,
aligning the two tabs on the shield’s top edge with the two slots in
the casting, then pivot the shield down into position. Engage the
two snaps on the right side first, then insert and snap down the
single left side clip (40).
6. Reinstall the vocoder board (50) with the component side of the
board facing downward.
7. Reinstall the vocoder board shield (46), engaging the two tabs on
the left side first, then snapping down the single right side snap.
If the encryption board (45) is equipped, reinstall it with the
shield:
a. Align the notches on the encryption board’s edge with the
internal tabs on the vocoder board shield.
b. Drop the board in place.
c. Slide the board upward until it stops, nested in the shield.
8. Reinstall the 50-pin (48) and 20-pin (47) compression connectors;
they can only be inserted in one way. Insert the 50-pin connector
with the smallest diameter peg pointing downward on the left
side. Insert the 20-pin connector with the two-peg edge pointing
downward on the left side.
9. Reinstall the controller board (44). Tuck the controller board’s
upper peninsula into the retention slot on the casting, rotate the
board into position, and engage the 20- and 50-pin connectors. If
the radio is equipped with hardware encryption, make sure that
the controller board’s connector mates fully with the encryption
board’s (45) connector.
10.Reinstall the controller front shield (41), with keypad (models II
and III only) and four clips (40) still attached, into the chassis.
Snap the controller front shield clips down, alternating diagonally
across the shield.
11.If you are reassembling a model II or III radio, continue with step
11; if you are resassembling a model I radio, skip to step 13.