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Motorola EP450 Chassis Disassembly, Audio jack shroud can be removed from the main board

Models: EP450

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6-8	Display Model Disassembly and Re-assembly:Disassembling and Re-assembling the Radio — General

	Tab
	Flat Blade
Hooks	Screwdriver
Hooks

PTT Seal

Tab

Figure 6-9. PTT Removal

6.4.1.6 Chassis Disassembly

CAUTION: Refer to the CMOS CAUTION paragraph (see 3.3) before removing the main board. Be sure

!to use Electrostatic Discharge protection when handling circuit boards.

1.Remove the O-ring.

2.Use a Torx™ screwdriver with a T6 bit to remove the four screws (Figure 6-10) holding the main board to the chassis.

.

Audio Jack Shroud

Main Board

Radio Chassis

O-Ring

Figure 6-10. Removal of Main Board from Chassis

3.The audio jack shroud can be removed from the main board.

December 3, 2003

HKLN4215A

Image 53

Motorola EP450 service manual Chassis Disassembly, Audio jack shroud can be removed from the main board

Contents

EP450 HKLN4215A Foreword Product Safety and RF Exposure ComplianceComputer Software Copyrights Document 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 MHzGeneral VHF Test SpecificationsTransmitter ReceiverModel 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 StandardsMajor Assemblies Theory Of OperationIntroduction If IC Test Equipment Test Equipment, Service Aids, and Service ToolsMotorola Part No Description Characteristics Application Motorola Part Description Application Service AidsTest Equipment, Service Aids, and Service Tools Service Aids 5mm Programming/Test CableGeneral Power-Up Self TestPerformance Checks 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 Radio Tuning SetupReference Oscillator Warp Initial Test Equipment Control SettingsTransmitter Alignment Options 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 25 kHz When using test box RLN4460VCO Attenuation VCO Attenuation 20 kHz VCO Attenuation 12.5 kHzUnder the Tx Align menu, select VCO Attenuation 12.5 kHz Under the Tx Align menu, select VCO Attenuation 20 kHzUnder Tx Align, select Dtmf Deviation Figure Dtmf Deviation TuningUnder the Tx Align, select MDC-1200 Signaling Figure Receiver TuningMDC-1200 Deviation Tuning Perform the rated volume tuning procedure as follows Rated Volume TuningManual Squelch Tuning Squelch TuningAuto Tune Rssi System Level TuningUnder the Rx Align menu, select Rssi Display Tuning Rssi Display TuningUtilities Radio-to-Radio Cloning12. Side Button Locations ProcedureRadio Alignment Procedures Radio-to-Radio Cloning Preventive Maintenance Display Model Disassembly and Re-assemblyCleaning Procedures Cleaning External Plastic SurfacesSafe Handling of Cmos and Ldmos Devices Cleaning Internal Circuit Boards and ComponentsDisassembling and Re-assembling the Radio General Radio Disassembly DetailedFront Cover From Chassis Disassembly 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 DisassemblyMicrophone and Speaker Re-assembly Radio Re-assembly DetailedDust Cover 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 Introduction Non-Display Model Disassembly and Re-assemblySafe 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 Power-Up Error Codes Troubleshooting TablesOperational Error Codes Error Code Possible Causes Corrective ActionTroubleshooting Table for Receiver Troubleshooting Table for Transmitter Troubleshooting Tables Troubleshooting Table for Transmitter Carrying Accessories Appendix a AccessoriesAntennas ChargersHeadsets Audio AccessoriesManuals Remote Speaker MicrophonesAccessories Warranty Appendix B Warranty, Service Support, and Replacement PartsReplacement Parts Ordering Scope of ManualMail Orders Motorola OnlineTelephone Orders Fax OrdersTechnical Support Motorola de Colombia Service CenterMotorola de Mexico Service Center Appendix B-4 Term Definition Glossary of TermsReset