5.15 Secure Hardware Failure - Motorola ASTRO XTSTM 4000 Detailed Service Manual

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5.15 Secure Hardware Failure

Repair
opens
Replace module
with known good
one and retest
Radio
No
functions with
known good
module?
Yes
Replace
secure
module
May 28, 2008
Fail
09/10 or 09/90
Secure Hardware
Failure
Verify connections
to secure module
through J2
No
Connections
good?
Yes
Is
Yes
known good
module
available?
No
Use ohmmeter to electrically
verify the following signal
connections to source IC:
Signal @ J2 Source
ENC_SSI_DI R1338
ENC_SSI_DO R1337
ENC_SSI_CLK R1335
RESET_ENC R1406
Verify bias of following signals:
Signal @ J701 Nominal Bias
FU_B+ 7.5VDC+/-1.0VDC
SW_B+ 7.5VDC+/-1.0VDC
GND
Replace
Mainboard
Troubleshooting Charts: Secure Hardware Failure
Synopsis
This failure relates 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
section at connector J2.
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 J2.
Connections
good?
Yes
Verify electrical activity
at the following signals
at power up:
Signal @ J701 Source
GND
ENC_SSI_DI
ENC_SSI_CLK
No Signals
good?
No
Repair
connections
R1338
R1335
Replace
Yes
secure
module
6871620L01-C