Troubleshooting Charts:
Keyload Failure
5-25
5.8
Keyload Failure
KEYLOAD FAILURE
Synopsis
This failure relates to only secure equipped radios
and indicates a failure to load key with the KVL
indicated by the message “KEYFAIL” and keyfail
tones.
Typical failures would be :
1) Open between the GCAI connector and the
microprocessor which prevents the keyloading.
2) Use of the wrong KVL or keyload cable.
3) Failure of the secure circuitry.
4) No secure personality in the radio codeplug.
With KVL attached to radio
and radio on, verify display
message “KEYLOADING”
Correct
Equipment?
Activity?
Keyloading
Message”
displayed?
With KVL attached to the radio
and radio on, initiate a keyload
from the KVL and look for activity
on keyload signal at the P1000_4
connector on the GCAI Flex.
Obtain correct KVL
and cable
Yes
Yes
No
Yes
Verify GCAI data path.
Check the following
signals: GPIO4, One Wire
Repair connector using
programming failure
flowchart for details.
No
No
Inspect GCAI
flex to board
connections and
Replace GCAI
Flex if
necessary
With KVL attached to the radio
and radio on, initiate a keyload
from the keyloader and look
for activity on keyload signal at
P1000_21 on Front Kit Flex.
Activity?
Replace Front Kit
Flex
Yes
Check signal at
R2358 on main board
Activity?
Inspect
U4003.
Measure
power pin5?
No
V = ~5.0V?
No
Proceed to
DC Flow
chart
Inspect U4003
with keyloader
attached.
Measure mux
select pin6.
V = ~0V
Inspect Q4001 with
keyloader attached .
Measure BJT input pin2.
No
Yes
Replace U4003
V = ~1.8V
No
Yes
Replace main
Board
Replace Q4001
Yes
Initiate a keyload
and check for
activity at R2501 of
main board
Yes
Activity?
No
Check the signal
Validity
Replace U2510
Yes
No
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......