Secure Hardware Failure - Motorola XTS 2500 Service Manual

VHF Troubleshooting Charts: Secure Hardware Failure

6.1.24Secure Hardware Failure

Repair
opens
Replace module
with known good
one and retest
Radio
functions with No
known good
module?
Yes
Replace
secure
module
6816985H01-F
Fail
09/10
Secure Hardware
Failure
Verify connections
to secure module
through J601
No
Connections
good?
Yes
Is
Yes known good
module
available?
No
Use ohmmeter to electrically
verify the following signal
connections to source IC:
Signal @ J601 Source
ENC_SSI_DI R626
ENC_SSI_DO R625
ENC_SSI_CLK R616
RESET_ENC Pin 42@J601
Verify bias of following signals:
Signal @ J601 Nominal Bias
UNSW_B+ 7.5VDC+/-1.0VDC
SW_B+ 7.5VDC+/-1.0VDC
GND
Replace
respective
source IC or
VOCON board
Failure
09/10 : Secure Hardware Failure
S03 : No communication between VOCON
and UCM
S02 : UCM tampered.
(keypad retainer removed)
Synopsis
This failure relates only to secure-equipped
radios and indicates a power-up self-test failure
for the secure module. More specifically this
failure indicates a failure in communications
between the DSP and secure module. The
secure module is not considered field repairable
so troubleshooting is limited to verifying a
problem with the module and replacing.
Typical failure modes would be:
1) Open between secure module and VOCON
board at J601.
2) Failure of the SSI bus that the DSP uses to
communicate with the secure module.
3) Failure to get proper supplies and grounds
to J601.
Connections
good?
Yes
Verify electrical activity
at the following signals
at power up:
Signal @ J601 Source
GND
ENC_SSI_DI
ENC_SSI_CLK
No Signals
good?
No
Repair
connections
R626
R616
Replace
Yes
secure
module
MAEPF-27387-O
February 14, 2012
6.1-23