Motorola MTX450 기본 서비스 매뉴얼 보충 자료 - 페이지 33

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Chapter 6

Power Up Self-Test

6.1

Turning on the radio starts a self-test routine that checks the RAM, ROM checksum, EEPROM

hardware, and EEPROM checksum. If these checks are successful, the radio generates two high-

pitched self-test pass tones, or a musical tone (selected in CPS). If the self-test is not successful, one

low-pitched tone is heard. Radios with displays are able to display the error codes. The displayed

error codes and related corrections are listed as follows:

If the error code

displayed is...

"RAM TST ERROR"

"ROM CS ERROR"

"EEPRM HW ERROR"

"EEPRM CS ERROR"

No Display

Table 6-1: Power-up Display Codes - (Conventional Radios)

then, there is

a...

RAM test failure.

Wrong ROM check-

sum.

Codeplug structure

mismatch or non

existence of

codeplug.

Wrong codeplug

checksum.

Bad display module

connection or dam-

aged display mod-

ule.

To correct the problem...

Retest the 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 or replace with new display module.

6-1