Motorola SSETM 5000 service manual Secure Hardware Failure, Synopsis

Troubleshooting Charts: Secure Hardware Failure 9-29

9.16 Secure Hardware Failure

Fail

09/10 or 09/90

Secure Hardware

Failure

Verify connections to secure module through J701

Repair	No	Connections
opens		good?
			Yes
		Is
Replace module	Yes
		known good
with known good
		module
one and retest		available?
			No

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 J701.

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 J701.

Radio

functions with

known good

module?

No

Use ohmmeter to electrically verify the following signal connections to source IC:

Yes

Replace

secure module

Signal @ J701 Source

ENC_SSI_DI R403

ENC_SSI_DO R402

ENC_SSI_CLK R405

RESET_ENC R418

Verify bias of following signals:

Signal @ J701 Nominal Bias UNSW_B+ 7.5VDC+/-1.0VDC

SW_B+ 7.5VDC+/-1.0VDC

GNDGND

Connections	No	Repair
good?		connections

Yes

Verify electrical activity at the following signals at power up:

Signal @ J701 Source

ENC_SSI_DI R403 ENC_SSI_CLK R405

Replace	No	Signals	Yes
respective
source IC or		good?
VOCON board

Replace

secure module

MAEPF-27387-O

6881094C12-A November 11, 2004