Troubleshooting Table For Receiver - Motorola CP140 Basic Service Manual

9-2
9.3

Troubleshooting Table for Receiver

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