Motorola HT750 Service Manual - Page 57
Power Up Self-Test
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6-1 Chapter 6 Power Up Self-Test 6.1 Error Codes - Conventional and LTR Radios 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 highpitched 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: Table 6-1: Power-up Display Codes - (Conventional Radios) If the error code displayed is... then, there is a... To correct the problem... "RAM TST ERROR" "ROM CS ERROR" "EEPRM HW ERROR" "EEPRM CS ERROR" No Display RAM test failure. Wrong ROM checksum. Codeplug structure mismatch or non existence of codeplug. Wrong codeplug checksum. Bad display module connection or damaged display module. 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.
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