HC2 HC7 HC8 HC3 | EFJohnson 7780 specs

SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS

HC1

R2

100K

R1

33K

C3

33P

R3

100K

C1

33P

C4

33P

MC1

Microphone

C2

33P

SP1

Speaker

R4

100K

C

F1

S1

F2	S2	F3	S3

HC5 HC6

C C

G K K K K K K K K G N E E E E E E E E N D Y Y Y Y Y Y Y Y D S S S S R R R R

0 1 2 3 0 1 2 3

	2 1 1 1 1 1 8 6 4 2	J1
	2 1 1 1 1 1 8 6 4 2	AXN720535
	0 8 6 4 2 0	AXN720535
	0 8 6 4 2 0
	1 1 1 1 1
	9 7 5 3 1 9 7 5 3 1

SS G G + B G G M M P P N N 5 K N N I I E D D L L D D C C

EE

D

HC2

C

HC7 HC8

C C

HC3	HC4
C	C

R8

Q1

2SA1576

10K

R6

220

DS2

LN1371G-(TR)

DS1

LN1371G-(TR)

C5

33P

3-KEY BOARD SCHEMATIC

	November 1999
8-13	Part No. 001-7780-500

Image 113

EFJohnson 7780 service manual HC2 HC7 HC8 HC3

Contents

7780 Page Page Table of Contents Table of Contents CONT’D List of Figures List of Tables Scope of Manual Equipment Description General Information Factory Customer Service AccessoriesPart Number Breakdown Transceiver Identification Accessory AccessoriesToll-Free 800 Factory Returns Definitions Replacement PartsInternet Home Intrinsically Safe Information Possible Ignition Sources Temperature Code T3CIntrinsically Safe and Nonincendive Ratings Classification of Hazardous Areas and Atmospheres Material Classification Accessing PC BoardsTypical Hazard Group Class Area Classification Removing Logic Unit Removing RF Unit General Specifications Controls and Display FeaturesTransceiver Operation Low-Battery Indicator Amber TX Indicator Red Indicates when the transmitter is keyed Display DisplayFront Panel Keys Full Keypad Model Option Switches Turning Power on and Setting VolumeGeneral Operation Backlight See Option Switch FunctionsFunction Conv Scanning Tone ENABLE/DISABLE Conventional and SMARTNET/ Smartzone Operation Monitoring Before Transmitting Conventional FeaturesDisplay Mode Selection Call Guard Squelch Monitor ModeBusy Channel Lockout Conversation Timer Penalty TimerPower Output Select Conventional Mode Scanning Priority Channel Sampling Standard Conventional Calls DTMF/ANI Signaling Viewing Unit ID SMARTNET/SMARTZONE FeaturesStandard Group Calls Enhanced Private Conversation Calls Transceiver Operation Private Conversation II Calls Telephone Calls Call Alert Sending Status Conditions Emergency Alarm and CallMessaging Dynamic Regrouping Failsoft OperationSMARTNET/SMARTZONE Scanning Supervisory Tones Zone Change Parameter Keypad ProgrammingMenu Description Channel Parameters Channel Change ParameterSystem Parameters Pctrunk Software Installation Programming SetupTransceiver Programming Computer Description Starting and Exiting Connecting RPI to Computer and TransceiverProgramming File Types Help Files Programming Procedure Screen Pop-Up Buttons and File Size IndicatorFile Size Indication Creating and Displaying Systems Menu Bar Menu Commands Download Menu Upload Menu Radio Type MenuSystems Menu Window Menu RADIO-WIDE Parameter Screens DefaultsBand Zones Radio-Wide Scan List Screen Radio Wide Scan ListModify List Screen Assign Function Buttons RADIO-WIDE SMARTNET/SMARTZONE Screen RADIO-WIDE Conventional ScreenFull Spectrum CC Scan Hot Dtmf RADIO-WIDE Portable Options Screen Adjustable ParametersProgramming Conventional Systems and Channels Conventional System General Screen Conventional System Modify Scan List Screen TimersKeypad Editing Scan List Button Priority Channel Selection Scan TimersSetting UP Conventional Channels Selected Channel Conventional Channel Screen Parameters Signaling Transmit PowerChannel Type Tx Time-Out Time-Out Timer Restricted AccessISW Delay Time Splinter Channels SMARTNET/SMARTZONE System Phone Interconnect Screen SMARTNET/SMARTZONE System Other ID’S ScreenPhone Interconnect Private Call Emergency Alarm SMARTNET/SMARTZONE System Emergency Settings ScreenSMARTNET/SMARTZONE System Talk Groups Screen Failsoft Channel Message Aliasing Screen SMARTNET/SMARTZONE System Lists ScreensTrunking Phone List Screen Control Channels Screen Announcement Groups Screen Trunking Call List Screen SMARTNET/SMARTZONE Channel Screen Parameters Setting UP SMARTNET/SMART- Zone ChannelsStatus Aliasing Screen Other Screen Parameters SMARTNET/SmartZone Channel Screen Recommended Tone Call Guard Codes Freq Call Guard CTCSS/DCS Codes and Tones MHz Channels MHz Channels MHz Channels MHz Channels MHz Channels MHz Channels Power Switching Power Switching and RegulationCircuit Description Synthesizer Description Charge Pump Q1, Q2, Loop Filter VCO and Tcxo ModulationSynthesizer Chip IC1 If Amplifier Q2, LIMITER/DETECTOR IC3 Receiver Circuit DescriptionRF Amplifier Q1, First Mixer Q2 Squelch Circuit IC4A/B, IC5A Antenna Switch and LOW-PASS FilterTransmitter Description Amplifier Q9, Driver Q8 Receive Audio Processing Control Logic and Display Pin Port Name Input or Description Active High Output Microprocessor IC306 Pin Descriptions Hvfulswlrq Receive Data FILTER/DETECTOR IC102A/B, IC107A/B Audio Amplifier IC104-IC106Receive and Transmit Data Processing Transmit Audio Processing Transmit Data Filter IC206B/ IC206A Smartnet Data Processing LOW-PASS Filter IC205A/B Battery Pack Battery Pack and Charger InformationPower Setting Operating Time Function Fahrenheit Celsius Battery Pack and Charger Information Test Setup Alignment Procedure and Performance Tests Mm/3/32 Mm/1/8 Phone Jack Tune Software Hqhudo Main Pctune Screen Preliminary Setup Transmit Power Adjustment Screen Transmit Frequency and PowerHigh Power Level = 3.0 watts Low Power Level = 1.0 watt Modulation Balance Rssi Adjust Squelch AdjustAudio Deviation Data Deviation Receiver Performance Tests Performance Tests Transmitter Performance Tests Power OutputTransmit Frequency Transmit Modulation This page intentionally left blank Display Assembly Parts ListChassis Parts Ref No Description Display Assembly KEY Assembly If Assembly If AssemblyKEY Assembly RF Unit PLL Assembly RF Unit NJM2904V-TE1 IC RF Unit Logic Unit Logic Unit TDA7233D IC Logic Unit 200K ERJ3GE MP35 MP18 MP25 EP2 KEY Front Panel EP1 MP32 MP33 MP27 MP34 MP28 MP29 MP23 MP22 MP30 MP24 MP26 MP18 PLL Board Bottom View Schematic Diagrams and Component LayoutsPLL Board TOP View If Board Bottom View If Board TOP View RF Unit Transceiver Block Diagram MIC RF Board TOP View If AMP RF Board Schematic HD1 Logic Board TOP View Receive Audio Processing Logic Board Schematic GND KEYR3 KEYR2 KEYR1 KEYR0 KEYS3 KEYS2 KEYS1 KEYS0 GND Display Board Bottom View DS3 DS4 DS5 Display Board Schematic KEY Board Back View KEY Board Front View S S R R R R KEY Board Schematic Scan HC2 HC7 HC8 HC3 Schematic Diagrams and Component Layouts