Maxon Telecom SM-2000 service manual Replacement Module Schematics, MMBV109

Page 63

REPLACEMENT MODULE SCHEMATICS

TH701

10K

TH703

150K

R706

47K

R708

R710R713

4

4

3

C816

 

D702

47K

2.2K47K

R714

2.2K

L804

4T

6

0.001

C813

33P

2

D701

MMBV109

R801

56K

5

 

 

R804

 

 

 

180

 

C821

C817

(470)

 

L804

 

270P

56P

 

6T

Q800

 

 

 

 

 

MMBR951

L806

L805

6T

6T

R801

6.8K

R800

 

 

 

 

820

C807

L802

C805

C803

C811

33P

6T

6P

33P

100P

 

 

 

 

 

 

 

L803

 

 

 

 

6T

 

 

 

L800

 

6T

 

 

C800

 

560P

C802

1

 

R702

*

R701

R704

*

R703

MMBV 105

LK701

R705

47K

C702

X701

12.8MHz

R707

47K

C705

100pF

Q701

MMBR9426

Q702

MMBR9426

 

C821

C819

C818

C816

C815

C813

 

C810

C808

C806

C805

C803

C802

 

 

27P

6.8P

6.8P

7P

15P

18P

 

0.001

20P

7P

7P

8P

11P

 

6

RF OUT

 

 

 

 

 

 

 

 

 

 

 

IN

1

 

 

 

 

 

 

 

Q801

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2SC5084

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

C822

C820

L806

C817

L805

C814

D801

 

C809

C807

L802

C804

 

 

C822

39P

C818

C815

C814

100P

150P

33P

 

 

 

 

 

R803 R802

2.2 3.3K

 

C806

C804

C812

D800

 

KDS226

 

39P

 

 

C808

L801

 

100P

6T

100P

 

C801

2

 

39P

 

1

*

*

TH702

33K

C701

100pF

100pF

R709

TC701 39K 20pF

C703

C704

91pF

180pF

R711

4.7KR712

39K

R715

2.2KC706 220pF

3

 

18P

N/A

4T

18P

4T

12P

 

KDS226

20P

N/A

4T

20P

 

C823

L807

 

 

 

 

C824

C812

R802

L803

 

 

L801

C801

18P

 

 

 

 

4P

470P

4T

 

 

4T

10P

4T

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RX 5V

4 3

SM-2150/VHF FRONT-END

SM-2000 TCXO

SM-2450/UHF FRONT-END

770-110-0002 Rev. B

770-100-0002 Rev. C

770-110-0001 Rev. B

(VHF Band 2 shown)

 

(UHF Band 2 shown)

Note 1: Schematics are for reference only. Reference designators and part values may not reflect product configuration.

Note 2: Refer to band chart for specific Front-End PCB assemblies.

Page-59-

December 98

Image 63
Contents SM-2000 Page Maxon SM-2000 Mobile Table of ContentsSchematics and Block Diagrams PCB LayoutsSM-2000 Exploded View Specifications Transceiver Nominal PerformanceGeneral Operational Bandwidth BandTransmitter Specfications TX Tone Modulation Characteristics SUB Audible Tones DCSReceiver 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 AmplifierRF Section SM-2450/UHF UHF TransmitterFrequency Synthesizer Circuit Voltage Controlled Oscillator Circuit First MixerSecond 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 Component Replacement Surface Mount ComponentsSurface 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