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
10-12
Chart 10. 01/92, Internal EEPROM Checksum Failure
Replace U701.
Reprogram Internal
EEPROM.
Internal
EEPROM
reprogrammed?
End
No
Yes
Verify operation of
Power Down Reset Per
Fig. W9.
Reset
Functional?
Replace U726.
No
Yes
Fail 01/92
Internal EEPROM
Checksum Failure
Realign radio.
MAEPF-26024-O
Synopsis
This failure indicates the Host
ยตC interal EEPROM is incorrect.
This data contains, among other
things, radio tuning parameters.
Basic failure modes are as
follows:
1) The contents of the internal
EEPROM have been corrupted.
A possible cause of corrupted
data may be improper operation
of the power down RESET
circuit U726.
2) An internal failure of U701
has occurred.