Maxon Telecom SM-2000 service manual Page-49 December

Page 53

MAXON SM-2000 MOBILE

COMPONENT PINOUT

= SM-2150/VHF

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

= SM-2450/UHF

BASE DIAGRAM

3 (GATE)

1 (DRAIN)

2 (SOURCE)

C

E

MANUFACTURER'S

REFERENCE NO.

 

PART NUMBER

 

MMBFJ309LT1

*Q351,*352

KTA1504S(ASG)

Q102,103,504,821,822

BCX-18LT1

*Q122

MMBC1321(Q4)

**Q130

MMBC1321

*Q106

KTC3875S(ALG)

Q101,104,360,550-553

KRA110S(PK)

**Q119,*139,128

B

B C

B

C

E

B

C

E

B

E

C

3

E

KRC111S

*Q353

KRA104S

*Q105,*407

MMBR951

*Q116

KRC104S(ND)

Q121,123,127,131,134,135

 

Q137,140,219,401-406,409

 

*Q108,*Q354,

 

**Q105,**Q407

BFG35

Q117

KTB1367

**Q125,135

KTA1658

*Q125

C1971

*Q118

4

1

2

C

E

B

MRF5711

**Q108

BFR92A

Q113,114,

*Q130,

 

 

**Q110,**Q111,**Q116

MMBR951

*Q800

2SC5084

**Q601

MMBR9426

Q701,702

Page-49-

December 98

Image 53
Contents SM-2000 Page Maxon SM-2000 Mobile Table of ContentsSM-2000 Exploded View Schematics and Block DiagramsPCB Layouts General SpecificationsTransceiver Nominal Performance Transmitter Operational BandwidthBand Specfications Receiver TX Tone Modulation CharacteristicsSUB Audible Tones DCS Accessories RX Tone Demodulation CharacteristicsSubaudible tones CTCSS/DCS Reliability AnalysisIntroduction Check the carton carefully for the following items Unpacking InformationGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel Digital Circuitry Theory of OperationCTCSS/DCS Decode Circuits CTCSS/DCS Encoder CircuitEeprom PLL RF Section SM-2150/VHF TX VCO RX VCOPrescaler Out of Lock DetectorReceiver RF AmplifierLow Pass Filter Receiver Audio CircuitAudio Amplifier Noise Detect Circuit SQ BoardFrequency Synthesizer Circuit RF Section SM-2450/UHFUHF Transmitter Second Oscillator- Mixer- Limiter and FM Detector Voltage Controlled Oscillator CircuitFirst Mixer Squelch Noise Band Pass Filter Squelch Mute CircuitNoise Detector Speaker Audio AmplifierTransmit 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 Removal Component ReplacementSurface Mount Components 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