EFJohnson 7780 service manual RF Unit, Transceiver Block Diagram

Page 103

 

 

 

 

 

 

 

 

Ceramic

Wide/Narrow

 

Ceramic

Ceramic

Wide/Narrow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bandpass

Band

Bandpass

Bandpass

Band

 

 

 

 

 

LOGIC UNIT

 

 

 

 

 

 

 

 

 

 

 

 

Filter

Switch

 

Filter

Filter

Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FI4

 

D15/

 

FI5

FI6

D13/

 

 

 

 

 

 

 

 

 

 

 

 

RF UNIT

 

 

 

 

D16

 

D14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W/N

Wide/Narrow Band Select

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

450 kHz Second IF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

44.775 MHz Second Injection

 

 

 

RSSI

 

 

 

 

 

 

 

 

Audio Amp

 

 

 

 

 

RECEIVER

 

First

45.225 MHz

IF BOARD

 

 

 

 

RECEIVE AUDIO PROCESSING

 

 

 

 

 

IC104

EXT Terminal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Accessory Connector)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bandpas

RF Amp

Bandpass

 

Mixer

 

Bandpass

IF Amp

 

 

 

 

 

 

Bandpass

 

Mute

 

 

 

 

 

 

 

 

Filter

Filter

 

Q2

 

Filter

 

 

 

 

 

 

 

Filter

Expander

Gate

Volume

 

 

Audio Amp

 

SP1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Control

Audio

 

SPE

 

 

 

 

Q1

FI2

 

 

 

FI3

 

 

 

Second Mixer/Detector

DET

 

 

IC101

IC208

 

 

 

16-Ohm

 

 

FI1

 

 

 

 

Q2

 

 

 

IC103

 

 

IC105,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Speaker

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1/2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC106

 

 

 

 

 

 

 

 

Rx Freq

 

 

 

IC3

 

 

 

Data

DC

 

R117

 

 

Audio Amp

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low Pass Filter

Restoration

 

 

 

 

 

 

 

 

 

 

 

 

Minus

 

 

 

 

 

 

 

 

 

 

 

AMUT

 

 

 

 

 

 

 

 

 

 

 

Noise

 

Noise

 

 

 

 

 

 

 

Q106,

 

 

 

 

 

 

 

 

45.225 MHz

 

Bandpass

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Comparator

 

 

IC102

IC107

 

 

 

LVCC

 

 

 

 

 

 

 

 

 

 

 

 

Filter

Detector

 

 

 

 

 

 

Q107

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RECEIVE DATA PROCESSING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bandwidth

Data

 

 

 

 

IC306

 

 

 

 

 

 

 

 

 

 

 

R13

VCO V Reg

CP V Reg

 

 

 

 

 

 

 

Microcomputer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Control

Mute Gate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Squelch

 

Q1

IC2

 

 

BWC

Q103

Q104

 

 

 

W/N

 

 

10-KEY OR 3-KEY

 

 

 

 

 

 

 

 

 

Level

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RSSI

 

 

BOARD

 

 

 

 

 

 

 

 

 

Adjust

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RF 5V

 

 

Smartnet

Data

 

 

 

 

NOISE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Regulator

 

 

T/R Switch

Low Pass Filter

DC Restoration

 

 

 

RXDATA

XTAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9.8304 MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC1

VCC

 

 

IC112,

IC113A,

 

 

 

SN RX

EXTAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXDATA

IC110

 

 

 

 

DISPLAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC113B

IC114

 

 

 

TXDATA

 

 

 

 

TRANSMITTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SMARTNET DATA PROCESSING

Data

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LC Display

 

Antenna

Reverse

Forward

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mute Gate

 

 

 

 

 

 

 

Low Pass

 

Antenna

 

Power

 

 

 

 

 

 

 

 

 

 

 

IC305,

 

 

 

 

 

Power

Power

 

 

 

 

 

Tx/Rx Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

Detector

Detector

Filter

 

Switch

 

Amp

Driver

Predriver

 

 

 

 

Q108

T5V

 

 

Q3

 

 

DS6

 

 

L13,

L34,

FI7

Q7, D1,

 

 

IC1

Q8

 

Q9

D7

 

 

 

 

 

 

 

 

ULOCK

 

 

 

 

 

D5

D4

D3, D11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Display

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel Sw

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Controller

 

 

 

 

 

 

 

 

 

Power

 

 

 

 

 

 

 

SMARTNET

 

 

 

QSEL 0-3

 

 

 

 

 

 

 

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Data

 

 

 

 

S1

 

 

IC1

 

 

 

 

 

 

 

 

Q5, Q6

 

 

 

 

 

 

 

 

 

Bandwidth

+5S

16K x 8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X3 Multiplier

 

 

 

 

 

 

 

SYNTHESIZER

 

 

 

 

 

Control

 

+3V Regulator

EEPROM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MSCK, MSO,

Key S0-S3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BWC

Q201

 

IC403

IC304

 

 

 

 

 

 

 

 

PLL BOARD

 

 

 

 

 

 

 

 

 

MSI, DPO TST

 

 

 

 

 

Q18

 

 

 

 

 

 

 

 

 

TRANSMIT DATA PROCESSING

 

 

 

 

 

Keyboard

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Key R0-R3

 

Ref Freq

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DTMF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Test

 

Data

DTMF

 

 

 

 

Set

 

 

 

IC1

Synthesizer Chip

 

 

 

 

 

 

 

 

 

 

 

 

+5V

Driver

14.925 MHz

 

 

 

 

 

 

 

T5V

Switch

LP Filter

Mute

Encoder

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Amp

TCXO

 

 

 

 

 

 

 

 

 

 

 

 

IC209

IC210

IC203

IC206

 

IC204A

IC303

DTMF SO

 

 

R73

 

 

 

 

 

 

 

 

Charge

 

 

 

Digital Pot

A/B

 

DTMF CK

 

 

 

X3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC4

 

 

Reference

fR

 

Pump

VCO

Buffer

PWR (Power Control)

 

Data Switch

TRANSMIT AUDIO PROCESSING

 

 

 

 

Microphone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Counter

 

6.25

 

 

 

 

 

 

 

 

Compressor

 

 

 

 

 

 

 

 

 

 

 

 

 

Q1, Q2

IC3

 

LTR(Modulation Balance)

 

 

Low Pass Filter

 

High Pass Filter

 

 

 

MC1

 

 

 

 

 

 

 

 

kHz

Phase

 

 

 

 

Q10, Q11

 

 

 

< 3 kHz

Limiter

> 300 Hz

 

Mic Mute Gate

 

 

 

 

 

 

 

Prescaler

 

 

 

 

Detector

 

 

 

MOD (Modulation)

 

 

 

 

 

 

 

 

 

 

 

 

 

Buffer

 

 

 

fV

 

 

Lock

 

 

 

IC205

IC202B

IC202A

IC208

IC204B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC201

 

 

 

 

 

 

 

 

 

Div By

 

N

 

 

 

 

 

Detect

 

 

 

1/2

 

 

 

 

 

 

Q12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PTTIN

 

 

 

 

 

Counter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PTT Sw

 

 

 

128/129

 

6.25

 

 

LD

 

 

Combiner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

kHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLLST

 

SWITCH BOARD

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ASSEMBLY

 

 

 

 

 

 

Counter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Supplies

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+5S Regulator

 

+5V Regulator

 

VCC Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q406

 

 

VCC

BAT

7.5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+5V

S5C

IC402

 

Q403

Battery

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T5V Regulator

 

L5V Regulator

 

 

Power

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LVCC Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T5V

Q405

T5C

IC401

 

On-Off Sw

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LVCC To

Q402

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Audio Amps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R5V Regulator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R5V

Q404

R5C

BAT To PA IC1,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pwr Ctrl Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+5L

 

 

 

 

 

 

 

 

 

 

8-3

November 1999

Part No. 001-7780-500

TRANSCEIVER BLOCK DIAGRAM

Page 102 Page 104
Image 103
Page 102 Page 104
Contents 7780 Page Page Table of Contents Table of Contents CONT’D List of Figures List of TablesScope of Manual Equipment Description General InformationTransceiver Identification AccessoriesFactory Customer Service Part Number BreakdownFactory Returns AccessoriesAccessory Toll-Free 800Internet Home Intrinsically Safe Information Replacement PartsDefinitions Classification of Hazardous Areas and Atmospheres Temperature Code T3CPossible Ignition Sources Intrinsically Safe and Nonincendive RatingsArea Classification Accessing PC BoardsMaterial Classification Typical Hazard Group ClassRemoving Logic Unit Removing RF UnitGeneral SpecificationsTransceiver Operation FeaturesControls and Display Low-Battery Indicator Amber TX Indicator Red Indicates when the transmitter is keyedFront Panel Keys Full Keypad Model DisplayDisplay Backlight Turning Power on and Setting VolumeOption Switches General OperationFunction Conv Option Switch FunctionsSee Scanning Tone ENABLE/DISABLEConventional and SMARTNET/ Smartzone Operation Display Mode Selection Conventional FeaturesMonitoring Before Transmitting Busy Channel Lockout Monitor ModeCall Guard Squelch Conventional Mode Scanning Penalty TimerConversation Timer Power Output SelectPriority Channel Sampling Standard Conventional Calls DTMF/ANI SignalingEnhanced Private Conversation Calls SMARTNET/SMARTZONE FeaturesViewing Unit ID Standard Group CallsTransceiver Operation Private Conversation II Calls Telephone Calls Call Alert Messaging Emergency Alarm and CallSending Status Conditions SMARTNET/SMARTZONE Scanning Failsoft OperationDynamic Regrouping Supervisory Tones Menu Description Keypad ProgrammingZone Change Parameter System Parameters Channel Change ParameterChannel Parameters Computer Description Programming SetupPctrunk Software Installation Transceiver ProgrammingHelp Files Connecting RPI to Computer and TransceiverStarting and Exiting Programming File TypesCreating and Displaying Systems Screen Pop-Up Buttons and File Size IndicatorProgramming Procedure File Size IndicationMenu Bar Menu CommandsWindow Menu Radio Type MenuDownload Menu Upload Menu Systems MenuZones DefaultsRADIO-WIDE Parameter Screens BandAssign Function Buttons Radio Wide Scan ListRadio-Wide Scan List Screen Modify List ScreenHot Dtmf RADIO-WIDE Conventional ScreenRADIO-WIDE SMARTNET/SMARTZONE Screen Full Spectrum CC ScanConventional System General Screen Adjustable ParametersRADIO-WIDE Portable Options Screen Programming Conventional Systems and ChannelsScan List Button TimersConventional System Modify Scan List Screen Keypad EditingSetting UP Conventional Channels Scan TimersPriority Channel Selection Selected Channel Conventional Channel Screen ParametersTx Time-Out Transmit PowerSignaling Channel TypeSplinter Channels Restricted AccessTime-Out Timer ISW Delay TimePrivate Call SMARTNET/SMARTZONE System Other ID’S ScreenSMARTNET/SMARTZONE System Phone Interconnect Screen Phone InterconnectFailsoft Channel SMARTNET/SMARTZONE System Emergency Settings ScreenEmergency Alarm SMARTNET/SMARTZONE System Talk Groups ScreenTrunking Phone List Screen SMARTNET/SMARTZONE System Lists ScreensMessage Aliasing Screen Control Channels Screen Announcement Groups ScreenTrunking Call List Screen Status Aliasing Screen Setting UP SMARTNET/SMART- Zone ChannelsSMARTNET/SMARTZONE Channel Screen Parameters Other Screen Parameters SMARTNET/SmartZone Channel ScreenRecommended Tone Call Guard Codes Freq Call Guard CTCSS/DCS Codes and TonesMHz Channels MHz Channels MHz Channels MHz Channels MHz Channels MHz Channels Synthesizer Description Power Switching and RegulationPower Switching Circuit DescriptionSynthesizer Chip IC1 VCO and Tcxo ModulationCharge Pump Q1, Q2, Loop Filter RF Amplifier Q1, First Mixer Q2 Receiver Circuit DescriptionIf Amplifier Q2, LIMITER/DETECTOR IC3 Amplifier Q9, Driver Q8 Antenna Switch and LOW-PASS FilterSquelch Circuit IC4A/B, IC5A Transmitter DescriptionReceive Audio Processing Control Logic and DisplayPin Port Name Input or Description Active High Output Microprocessor IC306 Pin DescriptionsHvfulswlrq Receive and Transmit Data Processing Audio Amplifier IC104-IC106Receive Data FILTER/DETECTOR IC102A/B, IC107A/B Transmit Audio Processing Transmit Data Filter IC206B/ IC206ASmartnet Data Processing LOW-PASS Filter IC205A/BFunction Fahrenheit Celsius Battery Pack and Charger InformationBattery Pack Power Setting Operating TimeBattery Pack and Charger Information Test Setup Alignment Procedure and Performance TestsMm/3/32 Mm/1/8 Phone Jack Tune Software HqhudoMain Pctune Screen Preliminary SetupModulation Balance Transmit Frequency and PowerTransmit Power Adjustment Screen High Power Level = 3.0 watts Low Power Level = 1.0 wattData Deviation Squelch AdjustRssi Adjust Audio DeviationReceiver Performance Tests Performance TestsTransmit Modulation Power OutputTransmitter Performance Tests Transmit FrequencyThis page intentionally left blank Ref No Description Parts ListDisplay Assembly Chassis PartsDisplay Assembly KEY AssemblyKEY Assembly If AssemblyIf Assembly RF Unit PLL AssemblyRF Unit NJM2904V-TE1 IC RF Unit Logic Unit Logic Unit TDA7233D IC Logic Unit 200K ERJ3GE MP35 MP18 MP25 EP2 KEY Front PanelEP1 MP32 MP33 MP27 MP34 MP28 MP29 MP23 MP22 MP30 MP24 MP26 MP18 PLL Board TOP View Schematic Diagrams and Component LayoutsPLL Board Bottom View If Board Bottom View If Board TOP ViewRF Unit Transceiver Block DiagramMIC RF Board TOP ViewIf AMP RF Board SchematicHD1 Logic Board TOP ViewReceive Audio Processing Logic Board SchematicGND KEYR3 KEYR2 KEYR1 KEYR0 KEYS3 KEYS2 KEYS1 KEYS0 GND Display Board Bottom ViewDS3 DS4 DS5 Display Board SchematicKEY Board Back View KEY Board Front ViewS S R R R R KEY Board SchematicScan HC2 HC7 HC8 HC3 Schematic Diagrams and Component Layouts
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