Maxon Telecom SM-2000 service manual Page-52 December

Page 56

MAXON SM-2000 MOBILE

VOLTAGE CHARTS (SM-2150/VHF)

IC404

 

 

 

 

PIN

TX UNMODE

RX MODE

 

 

 

 

1

1.9

VOICE 1.9

2

1.9

VOICE 1.9

3

1.9

VOICE 1.9

4

5

5

 

5

1.9

VOICE 1.9

6

1.9

VOICE 1.9

7

1.9

VOICE 1.9

8

1.9

VOICE 1.9

9

1.9

VOICE 1.9

10

1.9

VOICE 1.9

11

GND

GND

12

1.9

VOICE 1.9

13

1.9

VOICE 1.9

14

1.9

VOICE 1.9

 

IC405

 

 

PIN

TX

RX

1

1.93

2.00

2

1.93

2.00

3

1.8

2.00

4

0

0

 

5

1.92

2.00

6

1.92

2.00

7

1.92

2.10

8

5.00

5.00

 

IC406

 

 

PIN

TX

RX

1

3.05

AF 1.05

2

1.9

1.9

3

1.9

1.9

4

5

5

 

5

1.9

1.9

6

1.9

1.9

7

1.9

1.9

8

1.9

1.9

9

1.9

1.9

10

1.9

1.9

11

GND

GND

12

1.9

1.9

13

1.9

1.9

14

1.9

1.9

 

IC407

 

PIN

NORMAL

OPTION

1

1.9

XT2

2

0

XT2

3

3.6

XT2

4

0

XT2

5

2

1.9

6

5

5

7

1.9

1.9

8

1.05

XT2

9

5

CLK

10

GND

GND

11

5

CLK

12

0

0

13

2

1.9

14

2

1.9

 

IC410

 

PIN

BUSY

RX

1

AUDIO

1.9

2

AUDIO

1.9

3

AUDIO

1.9

4

5

5

5

AUDIO

1.9

6

AUDIO

1.9

7

AUDIO

1.9

8

AUDIO

1.9

9

AUDIO

1.9

10

AUDIO

1.9

11

GND

GND

12

AUDIO

1.9

13

AUDIO

1.9

14

AUDIO

1.9

 

IC107

IC105

IC402

 

PIN

 

1

 

2

3

IC107

 

13.7

 

0

8

IC105/402

 

8

 

0

5

Page-52-

December 98

Page 55 Page 57
Image 56
Page 55 Page 57
Contents SM-2000 Page Table of Contents Maxon SM-2000 MobileSM-2000 Exploded View Schematics and Block DiagramsPCB Layouts General SpecificationsTransceiver Nominal Performance Transmitter Operational BandwidthBand Specfications Receiver TX Tone Modulation CharacteristicsSUB Audible Tones DCS RX Tone Demodulation Characteristics AccessoriesSubaudible tones CTCSS/DCS Reliability AnalysisIntroduction Unpacking Information Check the carton carefully for the following itemsGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel Theory of Operation Digital CircuitryCTCSS/DCS Decode Circuits CTCSS/DCS Encoder CircuitEeprom PLL RF Section SM-2150/VHF RX VCO TX VCOOut of Lock Detector PrescalerReceiver RF AmplifierReceiver Audio Circuit Low Pass FilterAudio 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 Mute Circuit Squelch Noise Band Pass FilterNoise Detector 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 Removal Component ReplacementSurface Mount Components 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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