Motorola HT-1000 Service Manual page 141

Troubleshooting Secure
Operations
ERROR 09/10
Keyloading Problems
Refer to Section 6 of this radio service manual for disassembly and
reassembly information, refer to Section 9 "Removal And Installation"
for secure module and pad orientation, and refer to the radio theory/
troubleshooting manual for a general overview of troubleshooting
information and procedures. A key variable loader and oscilloscope are
needed to troubleshoot the Secure Module.
NOTE: The Secure Module itself is NOT serviceable. If
the Secure Module is found to be defective
then it must be replaced.
The MTS 2000 Series Handie-Talkie™ Portable Radio automatically
performs a self test on every power-up. Should the radio fail the self
tests, the display will show "ERROR XX/XX" (where XX/XX is
alphanumeric) accompanied by a short beep. If the display shows
"ERROR 09/10" or "E09/10", then the radio failed the secure power-up
self tests and the host microcontroller is unable to communicate with
the Secure Module via the SPI bus. Turn off the radio, check the battery
connection, and turn the radio back on. If the radio still does not pass
the self tests, then a problem exists with the secure operations of the
radio.
Since the module is removable, a good first step in troubleshooting
secure operation is simply to replace the suspect Secure Module with a
known working module. If this does not fix the problem, then the
original module is probably not the cause of the problem. If the new
module does fix the problem, then the original module must be
replaced.
A complete procedure for troubleshooting this error is listed below:
1. Turn the radio off, check the battery connection, and turn the
radio back on.
2. If the error condition still exists, check that a Secure Module is
installed and make sure that it is properly connected to the
controller board. To do this, refer to the disassembly and
reassembly sections of this manual.
3. Turn the radio back on.
4. If the error condition still exists and a working secure module with
the same kit number is available, replace the suspect module with
the working module.
5. If the problem persists, disassemble the radio and check the
encryption connector SPI pins (listed in Appendix Table 1) for data
transitions when the radio is turned on and off. If activity is not
seen on all five lines, check both sides of the connector for broken
connections.
6. Troubleshoot the Controller Board.
Use the following procedure to troubleshoot keyloading problems:
1. Verify that the correct Key Variable Loader (KVL) is being used for
the particular encryption algorithm present in the radio. Refer to
Appendix Table 2:
Appendix A- 3