Maxon Telecom SM-2000 service manual Page-50 December

Page 54

MAXON SM-2000 MOBILE

COMPONENT PINOUT

Unless otherwise indicated all parts are common to the SM-2000 Series Radio.

BASE DIAGRAM

 

MANUFACTURER'S

REFERENCE NO.

 

PART NUMBER

 

 

 

C

 

MMBV3401(4D)

D103-105,121

 

 

NC

 

KRS193S(F3)

D106,125,129,801,803

A

 

 

D805

 

 

 

C

 

 

 

 

 

1SS241(TY)

D127

A

 

 

 

 

 

BZX84C-5V

D807,808,810,811

 

A

MI402

**D108

 

 

C

 

MI301

**D120

 

 

 

 

A

 

 

 

IN5404

D124

C

= SM-2150/VHF

= SM-2450/UHF

Schematic

ZENER

C

1SV229

D101,102

Varicap Diode

A

 

 

 

 

A

KDS181(A3)

D402,*126,*128

Diode Switching

 

A

 

 

 

 

C

 

 

 

 

C

 

 

 

 

 

 

 

C

C

COMMON

KDS226(C3)

D551,552

 

COM

 

 

 

 

*D800

 

 

C

 

**D601

 

 

A

 

 

A

C

 

 

 

C

 

 

 

C

 

 

 

 

 

KDS184S(B3)

D401

 

 

A

 

 

 

 

A

 

 

A

A

 

 

 

C

MMBV105

D701

 

 

 

 

 

 

 

MMBD101

D107

 

 

NC

 

 

 

 

A

 

D702

 

 

 

MMBD101

 

 

Page-50-

December 98

Page 53 Page 55
Image 54
Page 53 Page 55
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
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