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
10-5
10
Chart 3. Radio Power-up Fail
Radio Power-Up
Failure.
Verify standard
bias per table
Table 3 pertaining
to host µC.
No
Yes
Standard
Isolate and
repair problem.
See chart C.5
bias OK?.
Using RSS,
verify radio is
not inhibited.
Signal @ U702 Source
OE* U701
WE* U701
HD0-HD7 U701
4XECLK U701
HA0-HA4,
HA14_IN, HA15_IN,
HA16,HA17 U701
CSIO1* U701
CSPROG* U701
Verify Host Port:
Use ohmmeter to
electrically verify
following signal connections
to source IC:
Signal @ U705 Source
HA0-HA13 U702
HD0-HD7 U701
MEMR/W* U702
OE* U702
CS* U708
Signal @ U708 Source
IN_B U701
IN_A U702
Synopsis
This failure assumes the radio
fails to power up correctly and
does not send any Power up
failure messages via the
display or serial bus. Some
basic failure modes:
1) Radio is inhibited.
2) Battery voltage is low.
3) A problem exists with a
supply or system clock.
4) Host µC code is corrupted.
5) Host FLASH or RAM is
faulty.
6) Corrupted host µC
configuration register.
7) Host µC or SLIC is faulty.
1
Radio is
not inhibited or
unable to
check?
Use RSS to
clear radio
inhibit.
YesNo
ReFLASH host
µC code.
Error
ReFLASHING
host µC code?
Reverify inital
problem.
Initial
problem
persists?
Yes No
Yes
No
End.
Error in
Bootstrapping
host µC?
Yes
No
Refer to section
on Failure to
Bootstrap.
Chart C.4
Refer to host µC
ROM checksum
error (FAIL 01/81).
Chart C.6
When reFLASHing
host code, there
are two
fundamental modes
of failure: 1) The
host µC fails to
respond or 2)
reports an error
in programming.
During radio power-up
Self-Test, verify
activity (transisitons
from high to low) on
U705 OE* and WE*.
Using RSS,
reinitialize host
µC
configuration
register and
reverify initial
problem. Note:
if this requires
writing the
internal EE, the
radio must be
realigned.
Power up
failure fixed?
1
No
Yes
End.
Connections
good?
Repair
connections.
Yes
No
Signals
verfied?
Replace U702.
During radio power-up
Self-Test, verify
activity (transisitons
from high to low) on
U705 CS*.
No
Yes
Signals
verfied?
Replace U705.
Verify operation of
U708 and logic AND
gate. During radio power
up Self-Test, verify
activity (transisitons
from high to low) on
U708 IN_B.
No Yes
MAEPF-26016-O
Signals
verfied?
Replace U708.
Replace U701.