Section 4
POWER UP SELF-TEST
1.0 Error Codes
Turning on the radio using the on/off volume control starts a self-test routine which checks the RAM,
ROM checksum, EEPROM hardware and EEPROM checksum. If these checks are successfully
completed, the radio will generate the Self-Test Pass Tone. If the self-test is not successful, a “bonk”
is heard. Radios with displays are able to display these error messages:
• “RAM TST ERROR” for <RAM Test Error>
• “ROM CS ERROR” for <ROM Checksum Error>
• “EEPRM HW ERROR” for <EEPROM Hardware Test Error>
• “EEPRM CS ERROR” for <EEPROM Checksum Error>
NOTE Radio without display emits only “bonk” (300 Hz) tone if it fails the self-test.
Error Code Explanation Corrective Action
“RAM TST ERROR” RAM Test Failure Retest radio by turning it off and turning it on again. If
message reoccurs, replace RAM (U405).
“ROM CS ERROR” ROM Checksum is
wrong.
Reprogram FLASH Memory, then retest. If message
reoccurs, replace ROM (U406).
“EEPRM HW ERROR” Codeplug structure
mismatch, non
existence of
codeplug.
Reprogram codeplug with correct version and retest
radio. If message reoccurs, replace EEPROM
(U407).
“EEPRM CS ERROR” Codeplug check-
sum is wrong.
Reprogram codeplug.
No Display Display module is
not connected
properly.
Display module is
damaged.
Check connection between main board and display
module.
Replace with new display module.
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