Keyload Failure - Motorola APX 3000 Detailed Service Manual

Troubleshooting Charts: Keyload Failure
5.8

Keyload Failure

Obtain correct KVL
and cable
Verify GCAI data path.
Check the following
signals: GPIO4, One Wire
Repair connector using
programming failure
flowchart for details.
Yes
Replace U2510
KEYLOAD FAILURE
No Correct
Equipment?
Yes
With KVL attached to radio
and radio on, verify display
message "KEYLOADING"
With KVL attached to the radio
Keyloading
and radio on, initiate a keyload
Yes
No
Message" from the KVL and look for activity
displayed? on keyload signal at the P1000_4
connector on the GCAI Flex.
Initiate a keyload
and check for
activity at R2501 of
main board
Yes
Activity?
No
Check the signal
Validity
Replace Q4001
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.
Activity?
Yes
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.
Yes
Replace U4003
V = ~0V
Yes
Inspect Q4001 with
keyloader attached .
V = ~1.8V
Measure BJT input pin2.
No
Replace main
Board
Synopsis
Inspect GCAI
flex to board
No
connections and
Replace GCAI
Flex if
necessary
No
Replace Front Kit
Activity?
Yes
Check signal at
R2358 on main board
Activity?
No
Inspect
U4003.
Measure
power pin5?
No Proceed to
V = ~5.0V?
Yes
Inspect U4003
with keyloader
attached.
Measure mux
select pin6.
No
5-25
Flex
DC Flow
chart