Power Up Self-Test; Error Codes - Motorola GP328 Plus Service Manual

Section 3

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. Radio emits only "bonk" (300
Hz) tone if it fails the self-test.
Error Code
"RAM TST ERROR"
"ROM CS ERROR"
"EEPRM HW ERROR"
"EEPRM CS ERROR"
No Display
Explanation
RAM Test Failure
ROM Checksum is
wrong.
Codeplug structure
mismatch, non
existence of
codeplug.
Codeplug check-
sum is wrong.
Display module is
not connected
properly.
Display module is
damaged.
Corrective Action
Retest radio by turning it off and turning it on again. If
message reoccurs, replace RAM (U405).
Reprogram FLASH Memory, then retest. If message
reoccurs, replace ROM (U406).
Reprogram codeplug with correct version and retest
radio. If message reoccurs, replace EEPROM
(U407).
Reprogram codeplug.
Check connection between main board and display
module.
Replace with new display module.
3-1