Maxon Telecom SM-2000 service manual Page-63- December

Page 67

 

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

 

 

 

 

 

 

 

770-000-0001revD.DWG

 

 

 

 

 

 

 

AUTOCAD R13c4

 

 

 

 

 

 

 

 

12-05-98

 

 

 

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-2150/VHF

 

 

 

 

 

 

 

 

 

 

 

 

DWN

 

 

DATE

 

 

RF SCHEMATIC DIAGRAM

CHK

 

 

DATE

 

DOCUMENT

770-000-0001

 

SIZE

B

 

 

 

 

 

NUMBER

 

 

 

 

 

 

 

 

 

 

PROD

ENGR

 

DATE

 

SCALE

NA

SHEET

2

OF

2

Page-63- December 98

Image 67
Contents SM-2000 Page Maxon SM-2000 Mobile Table of ContentsPCB Layouts Schematics and Block DiagramsSM-2000 Exploded View Transceiver Nominal Performance SpecificationsGeneral Band Operational BandwidthTransmitter Specfications SUB Audible Tones DCS TX Tone Modulation CharacteristicsReceiver 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 AmplifierUHF Transmitter RF Section SM-2450/UHFFrequency Synthesizer Circuit First Mixer Voltage Controlled Oscillator CircuitSecond 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 Surface Mount Components Component ReplacementSurface 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