Maxon Telecom SM-2000 service manual Page-56 December

Page 60

MAXON SM-2000 MOBILE

VOLTAGE CHARTS (SM-2450/UHF)

IC109

PIN

1

2

3

4

5

6

7

8

BUSY

7

OSC

6

7.2

6

6

6

7.2

RX (MUTE)

7

OSC

6

7.2

6

6

6

7.2

 

 

 

 

 

 

 

 

 

PIN

9

10

11

12

13

14

15

16

BUSY

AUDIO

0.8

NOISE

0.6

7

0

GND

2

RX (MUTE)

AUDIO

0.8

NOISE

1.8

7

8

GND

2

IC101

PIN

1

2

3

4

5

6

7

8

VOLTAGE

0

5

5

5

5

PD

GND

0

PIN

9

10

11

12

13

14

15

16

VOLTAGE

TEST

2

2

5

OSC

5

0

0

PIN

17

18

19

20

 

 

 

 

VOLTAGE

5

0

0

OSC

 

 

 

 

TRANSISTOR VOLTAGE CHART

 

 

RX

 

 

TX

 

REF.NO

B

C

E

B

C

E

Q108

1.2

3.5

0.6

1.2

3.5

0.6

Q110

0.6

1.8

GND

0.6

1.8

GND

Q111

3.6

4.3

2

3.6

4.3

2

Q113

0.7

2.5

GND

0.7

2.5

GND

Q114

3.1

5

2.3

3.1

5

2.3

Q116

 

 

 

1.5

7.5

1.2

Q117

 

 

 

0.7

7.5

GND

Q125

 

 

 

12

12.5

13.2

Q106

2

5

1.4

2

5

1.4

Q140

 

 

 

5

0

GND

Q119

 

 

 

0

8

8

Q130

0.5

5

0

 

 

 

Q122

 

 

 

7

6.7

6.8

Q121

 

 

 

5

0

GND

Q127

5

0

GND

 

 

 

Q128

0

8

8

 

 

 

Page-56-

December 98

Page 59 Page 61
Image 60
Page 59 Page 61
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 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 BoardRF Section SM-2450/UHF UHF TransmitterFrequency Synthesizer Circuit Voltage Controlled Oscillator Circuit First MixerSecond Oscillator- Mixer- Limiter and FM Detector 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 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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