Motorola ASTRO MT 1500, Service Manual, Page: 283 / 817

6816985H01-B August 16, 2007
900 MHz Troubleshooting Charts: Secure Hardware Failure 6.5-23
6.5.24Secure Hardware Failure
MAEPF-27387-O
Yes
No
Yes
No
No
No
Fail
09/10
Secure Hardware
Failure
Connections
good?
Repair
connections
Yes
Replace
secure
module
Verify electrical activity
at the following signals
at power up:
Connections
good?
Repair
opens
No
Yes
Is
known good
module
available?
Replace module
with known good
one and retest
Verify connections
to secure module
through J601
Signals
good?
Yes
Replace
secure
module
Radio
functions with
known good
module?
Replace
respective
source IC or
VOCON board
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.
Synopsis
09/10 : Secure Hardware Failure
S03 : No communication between VOCON
and UCM
S02 : UCM tampered.
(keypad retainer removed)
Failure
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
7.5VDC+/-1.0VDC
SW_B+ 7.5VDC+/-1.0VDC
GND GND
Signal @ J601 Source
ENC_SSI_DI R626
ENC_SSI_CLK R616