Motorola Mototrbo - Troubleshooting Charts; 1.0 Troubleshooting Flow Chart for Receiver

1-1
Section 1
TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 3)
NO RX AUDIO
Set radio in Analog mode on 488.5
MHz @ 12.5 KHz channel spacing
with open squelch
Inject 488.5 MHz @ RF LEVEL of -47
dBm with 1.5 KHz FM deviation with 1
KHz FM tone modulation at the antenna
Using a DMM probe at R1065
1.8 V
present?
No
Using an oscilloscope probe at
R1059, R1004, R1002, and
R1000, R1003.
Any
Activity?
No
Yes
Yes
>8.8V
Present?
No
Yes
Using a DMM, probe E0401
Using a DMM probe R0421 and
R0404
Between
4 V & 5 V
Present?
No
Yes
Using a DMM probe E0402
>2.0V
Present?
No
Yes
Check circuitry around Q0403
and look for opens and shorts
Using a DMM probe E0500
>5.0V
Present?
No
Yes
A
Refer to the VCO section
Refer to the RFIC section
Refer to the Controller
section