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
10-3
Chart 1. 800 MHz Radio Main
NO
NO
MAEPF-24396-A
Good Power-
Up Self
Test?
Is There
TX Power?
Is TX
Deviation
OK?
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
Receive
Audio?
Poor
SINAD?
END
START
Button's
Functioning?
Radio
Keyload
Failure?
Go to No Receiver
Audio Chart C.29
See Button Test
Chart C.20
Error
Message?
Display
Model?
Go to No Transmit
Audio Chart C.26
Go to Transmitter
Chart C.37
NO
YES
NO
YES
YES
See Keyload
Failure Chart
C.19
NO
YES
Go to No Receiver
RF Chart C.30
Go to DC Switch
Chart C.35
NO
YES
Is
R5
on?
See Table T1;
Power-up Self
Check Error Codes
Use RSS to
display
Error Messages
Error
Message
on RSS?
Either Bad Display.
(See Chart C.25), or
Radio Power-Up Failure
(See Chart C.3)