Scan | EFJohnson 7780 specification

SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS

SCAN

DS1	A/D		DS2	MENU
	(	)

3-KEY BOARD FRONT VIEW

	20	2
		J1
HC8	19	1
HC8	HC7

HC6 HC5

R8 R4 C5

R6 R3 HC4

HC3	HC2
R2	HC1
	Q1

C4

C2

C3

R1

C1

MICROPHONE SPEAKER

3-KEY BOARD BACK VIEW

November 1999
Part No. 001-7780-500	8-12

Image 112

EFJohnson 7780 service manual Scan

Contents

7780 Page Page Table of Contents Table of Contents CONT’D List of Tables List of Figures General Information Scope of Manual Equipment Description Accessories Factory Customer ServicePart Number Breakdown Transceiver Identification Accessories AccessoryToll-Free 800 Factory Returns Internet Home Intrinsically Safe Information Replacement PartsDefinitions Temperature Code T3C Possible Ignition SourcesIntrinsically Safe and Nonincendive Ratings Classification of Hazardous Areas and Atmospheres Accessing PC Boards Material ClassificationTypical Hazard Group Class Area Classification Removing RF Unit Removing Logic Unit Specifications General Transceiver Operation FeaturesControls and Display TX Indicator Red Indicates when the transmitter is keyed Low-Battery Indicator Amber Front Panel Keys Full Keypad Model DisplayDisplay Turning Power on and Setting Volume Option SwitchesGeneral Operation Backlight Function Conv Option Switch FunctionsSee Tone ENABLE/DISABLE Scanning Conventional and SMARTNET/ Smartzone Operation Display Mode Selection Conventional FeaturesMonitoring Before Transmitting Busy Channel Lockout Monitor ModeCall Guard Squelch Penalty Timer Conversation TimerPower Output Select Conventional Mode Scanning Priority Channel Sampling DTMF/ANI Signaling Standard Conventional Calls SMARTNET/SMARTZONE Features Viewing Unit IDStandard Group Calls Enhanced Private Conversation Calls Transceiver 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 Programming Setup Pctrunk Software InstallationTransceiver Programming Computer Description Connecting RPI to Computer and Transceiver Starting and ExitingProgramming File Types Help Files Screen Pop-Up Buttons and File Size Indicator Programming ProcedureFile Size Indication Creating and Displaying Systems Menu Commands Menu Bar Radio Type Menu Download Menu Upload MenuSystems Menu Window Menu Defaults RADIO-WIDE Parameter ScreensBand Zones Radio Wide Scan List Radio-Wide Scan List ScreenModify List Screen Assign Function Buttons RADIO-WIDE Conventional Screen RADIO-WIDE SMARTNET/SMARTZONE ScreenFull Spectrum CC Scan Hot Dtmf Adjustable Parameters RADIO-WIDE Portable Options ScreenProgramming Conventional Systems and Channels Conventional System General Screen Timers Conventional System Modify Scan List ScreenKeypad Editing Scan List Button Setting UP Conventional Channels Scan TimersPriority Channel Selection Conventional Channel Screen Parameters Selected Channel Transmit Power SignalingChannel Type Tx Time-Out Restricted Access Time-Out TimerISW Delay Time Splinter Channels SMARTNET/SMARTZONE System Other ID’S Screen SMARTNET/SMARTZONE System Phone Interconnect ScreenPhone Interconnect Private Call SMARTNET/SMARTZONE System Emergency Settings Screen Emergency AlarmSMARTNET/SMARTZONE System Talk Groups Screen Failsoft Channel Trunking Phone List Screen SMARTNET/SMARTZONE System Lists ScreensMessage Aliasing Screen Announcement Groups Screen Control Channels Screen Trunking Call List Screen Status Aliasing Screen Setting UP SMARTNET/SMART- Zone ChannelsSMARTNET/SMARTZONE Channel Screen Parameters SMARTNET/SmartZone Channel Screen Other Screen Parameters Call Guard CTCSS/DCS Codes and Tones Recommended Tone Call Guard Codes Freq MHz Channels MHz Channels MHz Channels MHz Channels MHz Channels MHz Channels Power Switching and Regulation Power SwitchingCircuit Description Synthesizer Description Synthesizer 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 Antenna Switch and LOW-PASS Filter Squelch Circuit IC4A/B, IC5ATransmitter Description Amplifier Q9, Driver Q8 Control Logic and Display Receive Audio Processing Microprocessor IC306 Pin Descriptions Pin Port Name Input or Description Active High Output Hvfulswlrq Receive and Transmit Data Processing Audio Amplifier IC104-IC106Receive Data FILTER/DETECTOR IC102A/B, IC107A/B Transmit Data Filter IC206B/ IC206A Transmit Audio Processing LOW-PASS Filter IC205A/B Smartnet Data Processing Battery Pack and Charger Information Battery PackPower Setting Operating Time Function Fahrenheit Celsius Battery Pack and Charger Information Alignment Procedure and Performance Tests Test Setup Tune Software Hqhudo Mm/3/32 Mm/1/8 Phone Jack Preliminary Setup Main Pctune Screen Transmit Frequency and Power Transmit Power Adjustment ScreenHigh Power Level = 3.0 watts Low Power Level = 1.0 watt Modulation Balance Squelch Adjust Rssi AdjustAudio Deviation Data Deviation Performance Tests Receiver Performance Tests Power Output Transmitter Performance TestsTransmit Frequency Transmit Modulation This page intentionally left blank Parts List Display AssemblyChassis Parts Ref No Description KEY Assembly Display Assembly KEY Assembly If AssemblyIf Assembly PLL Assembly RF Unit RF Unit NJM2904V-TE1 IC RF Unit Logic Unit Logic Unit TDA7233D IC Logic Unit 200K ERJ3GE MP35 MP18 MP25 KEY Front Panel EP2 EP1 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 TOP View If Board Bottom View Transceiver Block Diagram RF Unit RF Board TOP View MIC RF Board Schematic If AMP Logic Board TOP View HD1 Logic Board Schematic Receive Audio Processing Display Board Bottom View GND KEYR3 KEYR2 KEYR1 KEYR0 KEYS3 KEYS2 KEYS1 KEYS0 GND Display Board Schematic DS3 DS4 DS5 KEY Board Front View KEY Board Back View KEY Board Schematic S S R R R R Scan HC2 HC7 HC8 HC3 Schematic Diagrams and Component Layouts