Motorola CP140

9-2 Troubleshooting Tables: Troubleshooting Table for Receiver
9.3 Troubleshooting Table for Receiver
Table 9-3 lists the possible causes of, and corrections for, receiver problems.
Table 9-3. Receiver Troubleshooting Table
Symptom Possible Causes
Corrective or Test
(Measurements at Room Temperature)
Radio Dead; Display Does
Not Turn On
1. Dead Battery. Replace with charged battery.
2. Blown Fuse Send radio to depot.
3. On/Off Switch
4. Regulators
5. Regulator fault
Radio Dead; Display Turns
On
Transceiver Board Send radio to depot.
No Receive Audio, or
Receiver Does Not Unmute
Programming 1. Does the transmitted signal match the receiver configu-
ration (PL, DPL, etc.)?
2. With the monitor function enabled, can the radio be
unmuted?
Audio Distorted or Not Loud
Enough
Synthesizer Not On Fre-
quency
Check synthesizer frequency by measuring the transmit-
ter frequency; realign it off by more than ±150 Hz (VHF),
±500 Hz (UHF)
RF Sensitivity Poor 1. Synthesizer Not on Fre-
quency
Check synthesizer frequency by measuring the transmit-
ter frequency; realign it off by more than ±150 Hz (VHF),
±500 Hz (UHF)
2. Antenna Switch/Connec-
tor
Send radio to depot.
3. Receiver Front End Tun-
ing
Check RF front-end tuning for optimum sensitivity using
the tuner.
Radio Will Not Turn Off Transceiver Board Send radio to depot.