Maxon Telecom service manual Maxon SM-2000 Mobile, Table of Contents

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MAXON SM-2000 MOBILE

TABLE OF CONTENTS

TABLE OF CONTENTS

Table Of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Transceiver Nominal Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Tx Tone Modulation Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Sub Audible Tones - DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Rx Tone Demodulation Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Reliability Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Programmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Unpacking Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Description Of Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Theory Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

RF Section (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

RF Section (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

SM-2150/VHF Alignment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Alignment Points Diagram (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

SM-2450/UHF Alignment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Alignment Points Diagram (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Surface Mount Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Surface Mount Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Surface Mount Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Surface Mounted Integrated Circuit Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Parts List Common to SM-2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Electrical Parts List Main Board Digital Section (SM-2000) . . . . . . . . . . . . . . . . . 35 Electrical Parts List Band Chart (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . 37 Electrical Parts List Main Board (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . 38 Electrical Parts List Band Chart (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . 42 Electrical Parts List Main Board (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . 44 Component Pinout (SM-2000). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Voltage Charts (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Voltage Charts (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Trouble Shooting Chart (SM-2000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

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Contents SM-2000 Page Maxon SM-2000 Mobile Table of ContentsSchematics and Block Diagrams PCB LayoutsSM-2000 Exploded View Specifications Transceiver Nominal PerformanceGeneral Operational Bandwidth BandTransmitter Specfications TX Tone Modulation Characteristics SUB Audible Tones DCSReceiver Reliability Analysis RX Tone Demodulation CharacteristicsAccessories Subaudible tones CTCSS/DCSIntroduction Check the carton carefully for the following items Unpacking InformationGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel CTCSS/DCS Encoder Circuit Theory of OperationDigital Circuitry CTCSS/DCS Decode CircuitsEeprom PLL RF Section SM-2150/VHF TX VCO RX VCORF Amplifier Out of Lock DetectorPrescaler ReceiverNoise Detect Circuit SQ Board Receiver Audio CircuitLow Pass Filter Audio AmplifierRF Section SM-2450/UHF UHF TransmitterFrequency Synthesizer Circuit Voltage Controlled Oscillator Circuit First MixerSecond Oscillator- Mixer- Limiter and FM Detector Speaker Audio Amplifier Squelch Mute CircuitSquelch Noise Band Pass Filter Noise DetectorTransmit Tests Test SetupPLL Alignment SM-2150/VHF Alignment ProcedureReceiver Alignment RF Discriminator TuningAutomatic Power Adjustment Squelch AdjustmentModulation Deviation Adjustment CTCSS/DCS Deviation AdjustmentAlignment Points Diagram SM-2150/VHF SM-2450/UHF Alignment Procedure Page-28 December ∙ Note Release the PTT button when changing channels Page-30 December Alignment Points Diagram SM-2450/UHF Component Replacement Surface Mount ComponentsSurface Mount Removal Surface Mounted Integrated Circuit Replacement Surface Mount Component ReplacementREF # Description Parts List Common to SM-2000Digital Parts Common on Both VHF & UHF Digital Section REF # Description FRONT-END PCB Assembly Main Board Parts Band ChartPage-38 December Page-39 December Page-40 December Page-41 December SM-2450A UHF Band SM-2450C UHF Band SM-2450D UHF Band SM-2450E UHF Band Band ChartPage-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December IC409 Voltage Charts SM-2150/VHFPage-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Status Indications & Audible Tones Trouble Shooting Chart SM-2000Page-58 December MMBV109 Replacement Module SchematicsMA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SM-2000 Control Head SW5Page-66 December SM-2150/VHF Main Board AssyFront SM-2450/UHF Main Board AssySM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank