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Motorola EP450 service manual Dust Cover Disassembly, Speaker and Microphone Disassembly

Models: EP450

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

6.4.1.2Dust Cover Disassembly

1.Gently pry the top of the dust cover away from the body of the radio. (See Figure 6-6).

2.Rotate the dust cover 90° in a counterclockwise direction to allow the key to be removed.

3.Separate the dust cover away from the body of the radio. The dust cover key is fragile; apply only light pressure to the key while removing the dust cover.

key

	b. Rotate dust cover 90° to	c. Separate dust
	a. Pry dust cover from body.	cover from body.
	allow key to be removed.	cover from body.
	allow key to be removed.

Figure 6-6. Dust Cover Disassembly

6.4.1.3 Speaker and Microphone Disassembly

Note: The speaker is held in place with a retainer bracket. Be careful not to damage the speaker when removing the retainer bracket.

1.Remove the screw from the speaker retainer using a T6 Torx screwdriver (Figure 6-7.

2.Lift the retainer off the speaker, sliding end of retainer out of corner slot on the housing.

3.Lift the speaker out from the front housing.

4.Carefully lift microphone assembly out of housing.

Retainer Bracket

Speaker

Speaker Connector

Microphone

Radio Housing

Microphone Connector

Figure 6-7. Removal Speaker-Microphone Assembly

December 3, 2003

HKLN4215A

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Motorola EP450 service manual Dust Cover Disassembly, Speaker and Microphone Disassembly

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 StandardsTheory Of Operation IntroductionMajor Assemblies If IC Test Equipment, Service Aids, and Service Tools Motorola Part No Description Characteristics ApplicationTest Equipment Motorola Part Description Application Service AidsTest Equipment, Service Aids, and Service Tools Service Aids 5mm Programming/Test CablePower-Up Self Test Performance ChecksGeneral 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 SetupInitial Test Equipment Control Settings Transmitter Alignment OptionsReference 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 followingWhen using test box RLN4460 VCO AttenuationVCO 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 TuningReceiver Tuning MDC-1200 Deviation 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 ComponentsRadio Disassembly Detailed Front Cover From Chassis DisassemblyDisassembling 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 DisassemblyRadio Re-assembly Detailed Dust Cover Re-assemblyMicrophone 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 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 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 Colombia Service Center Motorola de Mexico Service CenterTechnical Support Appendix B-4 Term Definition Glossary of TermsReset