Motorola EP450 service manual Troubleshooting Table for Receiver

8-2 Troubleshooting Tables: Troubleshooting Table for Receiver

8.3Troubleshooting Table for Receiver

Table Table 8-3lists the possible causes of, and corrections for, receiver problems.

Table 8-3. Receiver Troubleshooting Table

Symptom		Possible Causes	Corrective or Test
			(Measurements at Room Temperature)
Radio Dead; Display Does	1.	Dead Battery.	Replace with charged battery.
Not Turn On
	2.	Blown Fuse	Send radio to depot.
	3.	On/Off Switch
	4.	Regulators
	5.	Regulator fault
Radio Dead; Display Turns	Transceiver Board		Send radio to depot.
On
No Receive Audio, or	Programming		1. Does the transmitted signal match the receiver configu-
Receiver Does Not Unmute			ration (PL, DPL, etc.)?
			2. With the monitor function enabled, can the radio be
			unmuted?
Audio Distorted or Not Loud	Synthesizer Not On Fre-		Check synthesizer frequency by measuring the transmit-
Enough	quency		ter frequency; realign it off by more than ±150 Hz (VHF),
			±500 Hz (UHF)
RF Sensitivity Poor	1.	Synthesizer Not on Fre-	Check synthesizer frequency by measuring the transmit-
	quency		ter frequency; realign it off by more than ±150 Hz (VHF),
			±500 Hz (UHF)
	2.	Antenna Switch/Connec-	Send radio to depot.
	tor
	3.	Receiver Front End Tun-	Check RF front-end tuning for optimum sensitivity using
	ing		the tuner.
Radio Will Not Turn Off	Transceiver Board		Send radio to depot.

December 3, 2003 HKLN4215A