Maxon Telecom SM-2000 service manual Transistor Voltage Chart

Page 57

MAXON SM-2000 MOBILE

VOLTAGE CHARTS (SM-2150/VHF)

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

2.5

7

4.5

GND

2

RX (MUTE)

AUDIO

0.8

NOISE

0

7

0

GND

2

IC101

PIN

1

2

3

4

5

6

7

8

RX VOLTAGE

0

5

5

5

5

PD

GND

0

TX VOLTAGE

 

2.5

5

5

5

0

0

2

PIN

9

10

11

12

13

14

15

16

RX VOLTAGE

5

2

2.7

5

3.5

5

0

0

TX VOLTAGE

2.7

3

2.7

5

3.5

5

0

0

PIN

17

18

19

20

 

 

 

 

RX VOLTAGE

5

0

0

OSC

 

 

 

 

TX VOLTAGE

5

0

0

2.3

 

 

 

 

TRANSISTOR VOLTAGE CHART

 

 

RX

 

 

TX

 

REF.NO

B

C

E

B

C

E

Q108

7.5

3.5

GND

0

3.5

GND

Q113

0.7

2.5

1.5

0.7

2.5

1.3

Q114

3.1

5

2.3

3.1

5

2.3

Q116

0

0

0

2

7

1.2

Q117

0

0

0

0.7

7.2

GND

Q125

12

13.72

13.7

12

12.5

13.2

Q106

7

2.5

GND

1

1.5

GND

Q140

0

7.5

GND

5

0

GND

Q130

0.7

5

0

0

2.5

0

Q122

8

0

8

7.3

8

8

Q121

0

8.1

0

5

0

GND

Q127

5

0

GND

 

 

 

Q128

0

8

8

 

 

 

Q120

0

13.8

GND

0

13.8

GND

Q118

0

9.5

GND

0

6

GND

Q139

7.5

0

8

0

8

8

Page-53-

December 98

Image 57
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 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 BoardRF Section SM-2450/UHF UHF TransmitterFrequency Synthesizer Circuit Voltage Controlled Oscillator Circuit First MixerSecond Oscillator- Mixer- Limiter and FM Detector 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 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