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
10-25
10
Chart 23. Radio Power-up Fail
Replace U701.
Synopsis
This chart relates to a failure
in the display. The display is
considered not field repairable
and must be replaced as a uint.
Basic Failure modes are as
follows:
1) Non-display model radio.
2) Bad connection.
3) Defective ยตC.
No Display.
Verify display model
with RSS.
Verify signal activity on
P301, pins 1-3
during mode select
changes.
Activity?
Verify P301
connections and bias.
Yes
Yes
No
No
Wrong model?
Fix with RSS.
Yes
No
P301 checks?
Replace
display clip.
MAEPF-26037-O
Replace display
module.