Section 7 -30 Troubleshooting charts
Troubleshooting Flow Chart
for Microcontroller
START
APPLY POWER TO RADIO AND
WAS GOOD OR BAD POWER-ON
YES
DONE
WAS GOOD POWER-ON BEEP
ARE ALERT TONES
ENABLED IN SPM
USE SPM TO ENABLE TONES
INVOKE FACTORY
RESET IN SPM
WAS GOOD POWER
ON BEEP PRESENT
MAIN RADIO BOARDS MUST BE
REPLACED
ARE TONES PRESENT
ON POWER UP AT
CN101 PIN 3?
AUDIO PROBLEM, TROUBLE-
SHOOT AUDIO CKT
WITH POWER CONNECTED TO RADIO AND THE RADIO TURNED
ON CHECK THE FOLLOWING:
1) 5V AT PIN 87 OF Q101. IF NONE CHECK U411.
2) WITH HIGH IMPEDANCE PROBE CHECK FOR 7.9488MHZ AT
PIN 13 AND 12 OF Q101, IF NO SIGNAL CHECK/REPLACE X101.
3) CHECK DC AT PIN 9 OF Q121. IF < 4.5VDC CHECK CN101
PIN 15.
4) CHECK FOR TYPICAL VOLTAGES OF Q101 AND Q114
VOLTAGES.
BEEP PRESENT
TURN ON
PRESENT
DONE
DONE
DONE
YES
YES
YES
YES
YES
NO/DONÕT
KNOW
NO
NO
NO
NO
(RF & CONTROLLER)
NOTE: Q101 is not replaceable. If Q101 is damaged, the controller and
RF boards both need to be replaced.
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