Maxon Telecom SM-2000 service manual SM-2450A UHF Band SM-2450C UHF Band SM-2450D UHF Band

Page 46
Page-42-
December 98

MAXON SM-2000 MOBILE

650-000-0002 SM-2450/UHF MAIN BOARD

650-000-0002 SM-2450/UHF MAIN BOARD

BAND CHART

SM-2450A UHF BAND 1

SM-2450C UHF BAND 2

SM-2450D UHF BAND 3

 

(400-430 MHz)

 

(420-450 MHz)

 

(440-470 MHz)

REF #

PART #

VALUE

 

REF #

PART #

VALUE

 

REF #

PART #

VALUE

 

FRONT-END PCB ASSEMBLY

FRONT-END PCB ASSEMBLY

FRONT-END PCB ASSEMBLY

650-110-0007

 

 

650-110-0008

 

 

650-110-0001

 

 

MAIN BOARD PARTS

 

 

MAIN BOARD PARTS

 

 

MAIN BOARD PARTS

 

 

C130

133-932-7Y

39pF

C130

133-932-7Y

39pF

C130

132-714-2Y

27pF

C133

131-039-1Y

10pF

C133

138-004-4Y

8pF

C133

136-833-6Y

6.8pF

C134

134-767-0Y

4.7pF

 

 

 

 

 

 

 

 

C135

139-003-8Y

9pF

C134

134-767-0Y

4.7pF

C134

134-007-7Y

4pF

 

 

 

 

 

 

 

 

C136

139-003-8Y

9pF

C135

138-004-4Y

8pF

C135

138-004-4Y

8pF

 

 

 

 

 

 

 

 

C158

131-039-1Y

10pF

C136

138-004-4Y

8pF

C136

131-208-7Y

12pF

 

 

 

 

 

 

 

 

C242

131-039-1Y

10pF

C158

135-010-4Y

5pF

C158

135-010-4Y

5pF

 

 

 

 

 

 

 

 

C243

131-039-1Y

10pF

C242

138-004-4Y

8pF

C242

138-004-4Y

8pF

 

 

 

 

 

 

 

 

C272

136-015-4Y

6pF

C243

134-767-0Y

4.7pF

C243

134-767-0Y

4.7pF

 

 

 

 

 

 

 

 

C273

131-029-2Y

10PF

C272

135-019-3Y

5pF

C272

135-019-3Y

5pF

 

 

 

 

 

 

 

 

C275

131-029-2Y

10PF

C273

131-029-2Y

10PF

C273

137-011-5Y

7PF

 

 

 

 

 

 

 

 

C277

131-029-2Y

10PF

C275

131-029-2Y

10PF

C275

139-006-1Y

9PF

 

 

 

 

 

 

 

 

C281

131-039-1Y

10pF

C277

131-029-2Y

10PF

C277

131-029-2Y

10PF

 

 

 

 

 

 

 

 

C283

137-011-5Y

7pF

C281

137-007-1Y

7pF

C281

137-007-1Y

7pF

 

 

 

 

 

 

 

 

IC103

220-347-2

M57729L

C283

136-015-4Y

6pF

C283

136-015-4Y

6pF

 

 

 

 

 

 

 

 

R180

060-472-1Z

4.7K

IC103

220-348-3

M57729

IC103

220-350-5

M57729H

 

 

 

 

 

 

 

 

R182

060-221-1Z

220 OHM

R180

060-472-1Z

4.7K

R180

060-392-2Z

3.9K

 

 

 

 

 

 

 

 

R210

060-470-9Z

47 OHM

R182

060-221-1Z

220 OHM

R182

060-101-6Z

100 OHM

 

 

 

 

 

 

 

 

 

 

 

 

R210

060-470-9Z

47 OHM

R210

060-470-9Z

47 OHM

Image 46
Contents SM-2000 Page Table of Contents Maxon SM-2000 MobilePCB Layouts Schematics and Block DiagramsSM-2000 Exploded View Transceiver Nominal Performance SpecificationsGeneral Band Operational BandwidthTransmitter Specfications SUB Audible Tones DCS TX Tone Modulation CharacteristicsReceiver 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 BoardUHF Transmitter RF Section SM-2450/UHFFrequency Synthesizer Circuit First Mixer Voltage Controlled Oscillator CircuitSecond 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 Surface Mount Components Component ReplacementSurface 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