Maxon Telecom SM-2000 specification

SM-2000

EXPLODED VIEW

Page-68-

December 98

Image 72

Maxon Telecom SM-2000 service manual

Contents

SM-2000 Page Table of Contents Maxon SM-2000 Mobile Schematics and Block Diagrams PCB LayoutsSM-2000 Exploded View Specifications Transceiver Nominal PerformanceGeneral Operational Bandwidth BandTransmitter Specfications TX Tone Modulation Characteristics SUB Audible Tones DCSReceiver RX Tone Demodulation Characteristics AccessoriesSubaudible tones CTCSS/DCS Reliability Analysis Introduction Unpacking Information Check the carton carefully for the following items General Description Description of Controls Description of Controls SM-2000 Rear Panel Theory of Operation Digital CircuitryCTCSS/DCS Decode Circuits CTCSS/DCS Encoder Circuit Eeprom PLL RF Section SM-2150/VHF RX VCO TX VCO Out of Lock Detector PrescalerReceiver RF Amplifier Receiver Audio Circuit Low Pass FilterAudio Amplifier Noise Detect Circuit SQ Board RF Section SM-2450/UHF UHF TransmitterFrequency Synthesizer Circuit Voltage Controlled Oscillator Circuit First MixerSecond Oscillator- Mixer- Limiter and FM Detector Squelch Mute Circuit Squelch Noise Band Pass FilterNoise Detector Speaker Audio Amplifier Test Setup Transmit Tests SM-2150/VHF Alignment Procedure PLL Alignment Discriminator Tuning Receiver Alignment RF Squelch Adjustment Automatic Power Adjustment CTCSS/DCS Deviation Adjustment Modulation Deviation Adjustment Alignment 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 Mount Component Replacement Surface Mounted Integrated Circuit Replacement Parts List Common to SM-2000 REF # Description Digital Parts Common on Both VHF & UHF Digital Section Band Chart REF # Description FRONT-END PCB Assembly Main Board Parts Page-38 December Page-39 December Page-40 December Page-41 December SM-2450A UHF Band SM-2450C UHF Band SM-2450D UHF Band Band Chart SM-2450E UHF Band Page-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December Voltage Charts SM-2150/VHF IC409 Page-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Trouble Shooting Chart SM-2000 Status Indications & Audible Tones Page-58 December Replacement Module Schematics MMBV109 MA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SW5 SM-2000 Control Head SM-2150/VHF Main Board Assy Page-66 December SM-2450/UHF Main Board Assy Front SM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank