5-30 Troubleshooting Charts: Keyload Failure
5.12 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”
Verify Keyfail
connection on
Controller board
atJ4001_42
Correct
Equipment?
Activity?
Keyloading
Message
displayed
With KVL attached to the radio
and radio on, initiate a keyload
from the keyloader and look
for activity on keyload signal at
J2004_20 on expansion
board.
Check for activity
at R5023
Obtain correct KVL
and cable
Yes
Yes
Yes
Yes
No
No
Yes
No
Verify the radio has been programmed with the correct secure algorithm and
verify using the correct keyloader.
Algorithm options:
NNTN7710 AES, DVP_XL, DUAL DISPLAY
NNTN7699 AES, DVP_XL
NNTN7708 DVP_XL, DUAL DISPLAY
NNTN7697 DVP_XL
NNTN7705 AES, DES, DES_XL, DES_OFB, DUAL DISPLAY
NNTN7694 AES, DES, DES_XL, DES_OFB
NNTN7701 AES, DUAL DISPLAY
NNTN7690 AES
NNTN7704 DES, DES_XL, DES_OFB, DUAL DISPLAY
NNTN7693 DES, DES_XL, DES_OFB
Use KVL-3000 or later model keyloader with keyload cable number CKN6904A
Verify GCAI data path.
Check the following
signals: GPIO, One Wire
Repair connector using
programming failure
flowchart for details.
No
Inspect and repair
keyload circuit on
Controller board
Activity?
Replace
Controller
Board
Activity?
Check and repair
connection from
P2004_20 on
Expansion Board
No
Inspect flex to
board
connections and
Replace Radio
Housing if
neccessary
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