Motorola EP450 service manual Troubleshooting Table for Receiver

Page 79

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

Page 78 Page 80
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Page 78 Page 80
Contents EP450 HKLN4215A Document Copyrights Product Safety and RF Exposure ComplianceForeword Computer Software CopyrightsTable of Contents Display Model Disassembly and Re-assembly Troubleshooting Tables Appendix a AccessoriesList of Figures 13. Microphone and Speaker Wires Re-assembly Related Publications List of TablesRadio Model Information Model Charts and Test SpecificationsModel Description Model Chart for VHF 146-174 MHz EP450, VHF, 146-174 MHzReceiver VHF Test SpecificationsGeneral TransmitterModel Chart for UHF 403-440 MHz EP450, UHF, 403-440 MHz Model Chart for UHF 438-470 MHz EP450, UHF, 438-470 MHz Model Chart for UHF 465-495 MHz EP450, UHF, 465-495 MHz LAH65SDH9AA4N UHF Test SpecificationsMIL-STD MIL StandardsIntroduction Theory Of OperationMajor Assemblies If IC Motorola Part No Description Characteristics Application Test Equipment, Service Aids, and Service ToolsTest Equipment Motorola Part Description Application Service AidsTest Equipment, Service Aids, and Service Tools Service Aids 5mm Programming/Test CablePerformance Checks Power-Up Self TestGeneral Service Monitor Test Set Power Supply RF Test ModeNo. of BKC No. Description Function BeepsVHF R2 UHF R1 UHF R2 UHF R3 Test Name Communications Analyzer Radio Test Set Comments Test ModePerformance Checks RF Test Mode CPS Programming Setup Radio Alignment ProceduresRadio Tuning Setup Transmitter Alignment Options Initial Test Equipment Control SettingsReference Oscillator Warp Under Tx Align menu, select Reference Oscillator Warp Figure Modulation Balance AttenuationTransmit Power Window High Power Transmit Power TuningTo Perform Transmit Low Power Tuning, do the following To Perform Transmit High Power Tuning, do the followingVCO Attenuation When using test box RLN4460VCO Attenuation 25 kHz Under the Tx Align menu, select VCO Attenuation 20 kHz VCO Attenuation 12.5 kHzVCO Attenuation 20 kHz Under the Tx Align menu, select VCO Attenuation 12.5 kHzUnder Tx Align, select Dtmf Deviation Figure Dtmf Deviation TuningMDC-1200 Deviation Tuning Receiver TuningUnder the Tx Align, select MDC-1200 Signaling Figure Perform the rated volume tuning procedure as follows Rated Volume TuningManual Squelch Tuning Squelch TuningAuto Tune Rssi System Level TuningRadio-to-Radio Cloning Rssi Display TuningUnder the Rx Align menu, select Rssi Display Tuning Utilities12. Side Button Locations ProcedureRadio Alignment Procedures Radio-to-Radio Cloning Cleaning External Plastic Surfaces Display Model Disassembly and Re-assemblyPreventive Maintenance Cleaning ProceduresSafe Handling of Cmos and Ldmos Devices Cleaning Internal Circuit Boards and ComponentsFront Cover From Chassis Disassembly Radio Disassembly DetailedDisassembling and Re-assembling the Radio General Antenna and Knob Removal Keyboard Flex Connection Speaker and Microphone Disassembly Dust Cover DisassemblyKeyboard Removal PTT DisassemblyAudio jack shroud can be removed from the main board Chassis DisassemblyDust Cover Re-assembly Radio Re-assembly DetailedMicrophone and Speaker Re-assembly 12. Microphone Re-assembly 14. Keypad Re-assembly Keypad and LCD/Keyboard Re-assemblyChassis Assembly/Re-assembly Keyboard Retainer Re-assembly17. Main Board onto Chassis Re-assembly Chassis and Front Cover Re-assembly18. Microphone and Speaker Wires Re-assembly 20. Fastening the Chassis PTT Re-assembly1 EP450 Display Exploded View and Parts List Mechanical View and Parts ListMotorola Motorola Part Description NumberDecember 3 Non-Display Model Disassembly and Re-assembly Safe Handling of Cmos and Ldmos Devices Disassembling and Re-assembling the Radio General Antenna and Knob Removal Speaker Connector Shroud Microphone Speaker and Microphone Disassembly Removal of Main Board from Chassis Chassis DisassemblyDust Cap Re-assembly 11. Speaker Re-assembly 12. Installation of Main Board onto Chassis 13. Microphone and Speaker Wires Re-assembly 15. PTT Re-assembly 16. EP450 Non-Display Radio Exploded View 1 EP450 Non-Display Exploded View and Parts List14Mechanical View and Parts List Error Code Possible Causes Corrective Action Troubleshooting TablesPower-Up Error Codes Operational Error CodesTroubleshooting Table for Receiver Troubleshooting Table for Transmitter Troubleshooting Tables Troubleshooting Table for Transmitter Chargers Appendix a AccessoriesCarrying Accessories AntennasHeadsets Audio AccessoriesManuals Remote Speaker MicrophonesAccessories Scope of Manual Appendix B Warranty, Service Support, and Replacement PartsWarranty Replacement Parts OrderingFax Orders Motorola OnlineMail Orders Telephone OrdersMotorola de Mexico Service Center Motorola de Colombia Service CenterTechnical Support Appendix B-4 Term Definition Glossary of TermsReset

EP450 specifications

The Motorola EP450 is a robust and reliable two-way radio that has made a significant impact in the world of professional communications. Known for its solid construction and exceptional performance, the EP450 is a popular choice among various industries, including security, transportation, and event management.

One of the standout features of the Motorola EP450 is its impressive audio quality. Equipped with advanced audio processing technologies, the radio offers clear and crisp sound, ensuring effective communication even in noisy environments. This feature is particularly beneficial for users who work in fields where situational awareness and timely communication are crucial.

The EP450 operates on both VHF and UHF frequency bands, making it versatile for various communication needs. With 16 channels and a wide frequency range, users can easily switch between channels to avoid interference and ensure secure communications. Additionally, the radio offers a programmable feature, allowing users to customize button functions and settings, which enhances the overall user experience.

The battery life of the EP450 is another notable characteristic. It comes powered with a long-lasting rechargeable battery that provides extended usage on a single charge. This ensures that users can rely on the device throughout their shifts without concerns about running out of power. Furthermore, the EP450 features a battery save mode that helps conserve energy when the radio is not in use.

In terms of design, the Motorola EP450 is built to withstand tough environments. Its rugged housing is dustproof and can withstand exposure to water, making it suitable for outdoor use. Additionally, the radio's user-friendly interface includes a large display and oversized buttons, allowing users to operate it easily even with gloves or in challenging conditions.

Furthermore, the EP450 supports various accessories, such as headsets and external microphones, enhancing usability and flexibility in various operational scenarios. This adaptability allows users to customize their communication solutions based on specific needs.

In conclusion, the Motorola EP450 stands out for its superior audio quality, versatile frequency operation, long-lasting battery life, and rugged design. These features make it an indispensable tool for professionals who require reliable communication in demanding environments, proving its value across a multitude of industries.
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