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iv Table of Contents
December 3, 2003 HKLN4215A
5.4.3 Transmit Power Tuning.....................................................................................................5-5
5.4.3.1 To Perform Transmit High Power Tuning, do the following: ..............................5-6
5.4.3.2 To Perform Transmit Low Power Tuning, do the following: ..............................5-6
5.4.4 VCO Attenuation...............................................................................................................5-7
5.4.4.1 VCO Attenuation 25 kHz....................................................................................5-7
5.4.4.2 VCO Attenuation 12.5 kHz.................................................................................5-8
5.4.4.3 VCO Attenuation 20 kHz....................................................................................5-8
5.4.5 DTMF Deviation Tuning....................................................................................................5-9
5.4.6 MDC-1200 Deviation Tuning...........................................................................................5-10
5.5 Receiver Tuning...........................................................................................................................5-10
5.5.1 Rated Volume Tuning .....................................................................................................5-11
5.5.2 Squelch Tuning ...............................................................................................................5-12
5.5.2.1 Manual Squelch Tuning ...................................................................................5-12
5.5.2.2 Auto Tune ........................................................................................................5-13
5.5.3 RSSI System Level Tuning.............................................................................................5-13
5.5.4 RSSI Display Tuning.......................................................................................................5-14
5.6 Utilities .........................................................................................................................................5-14
5.6.1 Program Serial No. .........................................................................................................5-14
5.6.2 Temp Comp Data Read..................................................................................................5-14
5.6.3 Temp Comp Data Write ..................................................................................................5-14
5.7 Radio-to-Radio Cloning................................................................................................................5-14
Chapter 6 Display Model Disassembly and Re-assembly ................ 6-1
6.1 Introduction ....................................................................................................................................6-1
6.2 Preventive Maintenance ................................................................................................................6-1
6.2.1 Inspection..........................................................................................................................6-1
6.2.2 Cleaning Procedures ........................................................................................................6-1
6.3 Safe Handling of CMOS and LDMOS Devices..............................................................................6-2
6.4 Disassembling and Re-assembling the Radio — General.............................................................6-3
6.4.1 Radio Disassembly — Detailed ........................................................................................6-3
6.4.1.1 Front Cover From Chassis Disassembly ...........................................................6-3
6.4.1.2 Dust Cover Disassembly....................................................................................6-6
6.4.1.3 Speaker and Microphone Disassembly .............................................................6-6
6.4.1.4 Keyboard Removal ............................................................................................6-7
6.4.1.5 PTT Disassembly...............................................................................................6-7
6.4.1.6 Chassis Disassembly.........................................................................................6-8
6.4.2 Radio Re-assembly - Detailed ..........................................................................................6-9
6.4.2.1 Dust Cover Re-assembly...................................................................................6-9
6.4.2.2 Microphone and Speaker Re-assembly.............................................................6-9
6.4.2.3 Keypad and LCD/Keyboard Re-assembly .......................................................6-11
6.4.2.4 Keyboard Retainer Re-assembly.....................................................................6-12
6.4.2.5 Chassis Assembly/Re-assembly......................................................................6-12
6.4.2.6 Chassis and Front Cover Re-assembly ...........................................................6-13
6.4.2.7 PTT Re-assembly............................................................................................6-15
6.5 Mechanical View and Parts List...................................................................................................6-16
6.5.1 EP450 Display Model Exploded View and Parts List......................................................6-16
Chapter 7 Non-Display Model Disassembly and Re-assembly ........ 7-1
7.1 Introduction ....................................................................................................................................7-1
7.2 Preventive Maintenance ................................................................................................................7-1
7.2.1 Inspection..........................................................................................................................7-1
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