Motorola APX 2000 - Page 131

Troubleshooting Charts: Keyload/Secure Hardware/Memory 5-33
Secure Hardware Failure
09/10 or 09/90
Secure Hardware Failure
Use an ohmmeter to electrically verify the following secure related
signals on the controller board and the Vdd levels:
Signal
Probe Point Level
VDD_IOP R2509 1.875V
VDD_IOM R2511 1.875V
VDDC R2512 1.875V
Use an oscilloscope to verify activity
during power-up on Keypad board:
Signal
Probe Point
SSI_RED_RX_MACE P2001_6
SSI_MACE_DIN P2001_4
Replace Keypad
board.
Are voltage levels
correct?
Are data signals
present?
Repair DC Voltage
Regulators
No
No
Yes
Yes
Synopsis
This failure relates only to secure
equipped radios and indicates a power
up self test failure for the secure
circuitry. More specifically this failure
indicates a failure in communications
between the DSP and the secure
circuitry. The secure circuitry is not
considered to be field repairable so
troubleshooting is limited to verifying a
problem with the secure circuitry and
replacing the controller if required.
Use an oscilloscope to verify clocks on Keypad board:
Signal
Probe Point Frequency
MACE CLOCK P2001_44 4 MHz
OPT_SSI_CLK P2001_18 1.5 MHz
OPT_SSI_FSYNC P2001_30 8 KHz
4 MHz
1.5 MHz
8 KHz
Are signals correct?
No
Check SSI clock
signals from CPLD
and repair circuitry
Yes
Make sure the radio is fully assembled. These
errors will occur if Main or Keypad boards are
not properly assembled. Also note a battery
removal and reattachment is needed after a
“Secure HW Upgrade” to clear errors.
Use an oscilloscope to verify clocks on Main board:
Signal
Probe Point Frequency
MACE CLOCK R6113
SSI_OPT_CLK R6107
OPT_SSI_SYNC R2513
Are signals correct?
Examine connection
between Main and
Keypad J2301 & P2001
Yes
No
Use an oscilloscope to verify activity on Main board :
Signal
Probe Point
SSI_RED_RX_MACE J2301_6
SSI_MACE_DIN J2301_4
Are data signals
present?
Yes
No