Maxon Telecom SM-2000 service manual Page-62- December

Page 66

 

REVISIONS

REV

DESCRIPTION

ARELEASED TO MANUFACTURING

BECO 97014 Change to Sheet 1, Digital Section Only

C ECO 97020

D ECO 98017 Change to Sheet 2, RF Section Only

BY CHG

JPW

JPW

JPW

JPW

DATE

9/96

4/97

4/97

11/98

Page-62- December 98

 

 

 

 

 

 

 

 

DIGITAL.DWG

 

 

 

 

 

 

 

 

AUTOCAD R13c4

 

 

 

 

 

 

 

 

11-18-98

 

 

UNLESS OTHERWISE NOTED

 

 

 

 

R

 

 

 

 

 

 

 

 

 

DIMENSIONS ARE IN MILLIMETERS

 

 

 

 

 

 

 

 

TOLERENCES:

 

 

 

A World of Communications

 

 

HOLES

LINEAR

ANGLES

 

 

 

 

 

10828 NW Air World Drive

 

 

+

 

. X X +

+

 

 

 

 

 

 

NA

 

 

Kansas City, Missouri 64153

 

- NA

-

-

TITLE

 

 

 

 

. X X X + NA

 

 

SM-2000

 

 

 

-

 

 

 

 

 

DWN

 

 

DATE

 

 

MAIN BOARD SCHEMATIC

 

 

 

 

(DIGITAL SECTION)

 

 

 

 

 

 

 

 

CHK

 

 

DATE

 

DOCUMENT

770-000-0001 VHF

SIZE

B

 

 

 

 

 

NUMBER

770-000-0002 UHF

 

 

 

 

 

 

 

 

PROD

ENGR

 

DATE

 

SCALE

NA

SHEET

1 OF

2

Image 66
Contents SM-2000 Page Table of Contents Maxon SM-2000 MobileSchematics and Block Diagrams PCB LayoutsSM-2000 Exploded View Specifications Transceiver Nominal PerformanceGeneral Operational Bandwidth BandTransmitter Specfications TX Tone Modulation Characteristics SUB Audible Tones DCSReceiver Subaudible tones CTCSS/DCS RX Tone Demodulation CharacteristicsAccessories Reliability AnalysisIntroduction Unpacking Information Check the carton carefully for the following itemsGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel CTCSS/DCS Decode Circuits Theory of OperationDigital Circuitry CTCSS/DCS Encoder CircuitEeprom PLL RF Section SM-2150/VHF RX VCO TX VCOReceiver Out of Lock DetectorPrescaler RF AmplifierAudio Amplifier Receiver Audio CircuitLow Pass Filter Noise Detect Circuit SQ BoardRF Section SM-2450/UHF UHF TransmitterFrequency Synthesizer Circuit Voltage Controlled Oscillator Circuit First MixerSecond Oscillator- Mixer- Limiter and FM Detector Noise Detector Squelch Mute CircuitSquelch Noise Band Pass Filter Speaker Audio AmplifierTest Setup Transmit TestsSM-2150/VHF Alignment Procedure PLL AlignmentDiscriminator Tuning Receiver Alignment RFSquelch Adjustment Automatic Power AdjustmentCTCSS/DCS Deviation Adjustment Modulation 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 Mount Component Replacement Surface Mounted Integrated Circuit ReplacementParts List Common to SM-2000 REF # DescriptionDigital Parts Common on Both VHF & UHF Digital Section Band Chart REF # Description FRONT-END PCB Assembly Main Board PartsPage-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 BandPage-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December Voltage Charts SM-2150/VHF IC409Page-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Trouble Shooting Chart SM-2000 Status Indications & Audible TonesPage-58 December Replacement Module Schematics MMBV109MA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SW5 SM-2000 Control HeadSM-2150/VHF Main Board Assy Page-66 DecemberSM-2450/UHF Main Board Assy FrontSM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank