General Information | EFJohnson 761X, 764X instruction

GENERAL INFORMATION

NOTES

November 1998
Part No. 001-7600-001	1-6

Image 11

EFJohnson 761X, 764X service manual General Information

Contents

761x VHF 764x UHF Conventional Mobile Conventional FM TWO-WAY Radio Table of Contents Table of Contents CONT’D Schematic Diagrams and Component Layouts General Information Factory Returns 75xx AccessoriesAccessory Toll-Free 800 Internet Home Replacement Parts This page intentionally left blank General VHF and 7640 UHF Mobile Specifications General Information Transceiver Installation Installation and Disassembly Cable Installation Installing Mounting BracketInstalling Microphone Hanger Power Cable Installation Accessory Cable Installation Power Cable FusesChanging 20-Ampere Power Cable Fuses Using AN External Speaker Remove shield E Transceiver DisassemblyRemoving PC Board 2 2-TONE Programming 2-TONE/5-TONE Module InstallationInstallation Procedure Setting 5-Tone Deviation Installation and Disassembly Operation Features Basic Operation Controls and DisplayTransceiver Back Panel Direct Selection The F1-F4 Receiving and Placing Calls Function Key Label Description Section No TIME-OUT TimerProgrammable Functions Option Key Programmable Functions Channel Select Monitor Mode SelectOutput Power Select Call Guard Tone Select Channel Scan Priority Channel Sampling Programming Software Programming SetupSection Programming Programming Cables File Menu Starting the ProgramSpecial Keys and Functions Menu Flow Model Menu Screen MenuProgram Menu Print Menu Parameter Description Bank Select Setup MenuMemory Channel Screen Description LMR Models Rx/Tx TimerCh Atr Frequency Tone Auto ResetLockout Scan Key Description Key and Display Assign Screen Description Key Description Label Bank/Free RF PowerDtmf Autodial Screen Description Selection Parameter Description Continuous Tone Screen DescriptionScan Function Screen Description Auto CH Stop Timer2-Tone Code Channel Screen Description Resume Stun EXO TimerTimer Auto Tx Auto Tx Common Screen Description Expert Screen Description Unique PMR Screens Unique PMR European Screens Cloning Programming ONE Transceiver with Another Memory Channel Screen PMR Models This page intentionally left blank VHF Receiver Circuit VHF 7610 Circuit Description Receiver Mute Circuit Audio Amplifier Circuit Modulation Circuit Power Amplifier ModuleVHF Transmitter Circuit Microphone Amplifier Circuit PLL Circuit APC CircuitVHF PLL Circuit Pin Port Description VHF IC PIN DescriptionsLine Description Pin Port Description Name VHF I/O Expander IC5 Main UnitPin VHF Port Expander IC11 Main Unit UHF Receiver Circuit UHF 7640 Circuit Description Second if System IC1 UHF UHF Transmitter Circuit UHF PLL Circuit PLL Circuit UHF UHF CPU IC1 Port Allocation UHF Power Supply UHF Port Expander IC13 Main Unit UHF I/O Expander IC12 Main Unit Equipment Grade and Range Adjustment ProcedureTest Setup Suggested Test Equipment Test Cable Test Channels UHF Test Frequencies COMPUTER-AIDED TuningVHF Test Frequencies PLL Adjustment VHF Models VHF AdjustmentsVHF Adjustments Preliminary Setup FM Deviation Adjust VHF Adjustments CONT’DOutput Power Adjust Squelch Adjust Dtcs Waveform AdjustReceiver Adjustments VHF Models Bandpass Filter Adjust Beep Tone Level Beep Tone Level Adjustment Transmitter Adjustments UHF Models UHF AdjustmentsPLL Adjustment UHF Models UHF Adjustment Points UHF Adjustments CONT’D UHF Adjustments CONT’D Receiver Adjustments UHF Models Æçìíýõ9+ôý0$,1ý81,7 Parts List Íäç HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ Íëëðêäíçðíçí Íäæ Ìää HUDPLFý&ìçíåý-%ýì&ýìíé.7ð1 Íëëðêäíçðçìé Ëíí Ëäí HUDPLFý&ìçíåý-%ýìýìíê.ð7ð$ Íëëðêäíçðíçê Ëäì RLOý0/ìçíå$ýì5í.ð7 Íëëðêäíçðçèç 03ì Ýìäëëý9&2ýFDVH 5íéé 5HVý5-ê*-ýìííý9ýõìíýRKPô Íëëðêäíçðìêå 5íéè 5ìèé 5HVý5-ê*-ýìíéý9ýõìííýNýRKPô Æçéíýõ8+ôý0$,1ý81,7 Íêì HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ Íëëðêäíçðíçí Íêë Íäé HUDPLFý+0çí6-ý&+ýíêíýèíí9ý Õéäíðèìëý0+ô Ìèì 5HIý1Rï Êëç Íëëðêäíçðäèë 4éì 7UDQVLVWRUý7&êçê.ý7ìéæ 5íæé 5ìçå 5HVý5-ê*-ýìíéý9ýõìííýNýRKPô 5217ý81,7 Õ9+ý$1ý8+ý02/6ô =HQHUý0$åíèìð0ýõ7ô Æçìíýõ9+ôý&+$66,6ý3$576 Front Unit VHF 7610 Exploded View UHF 7640 Exploded View Front Unit Schematic Diagrams and Component LayoutsVHF 7610 Block Diagram Main Unit VHF 7610 Transistor Basing Diagrams Foldout → VHF 7610 Main Board TOP View VHF Main Unit VHF 7610 Main Board Schematic UHF 7640 Block Diagram UHF 7640 Main Board Bottom View J4 T o O p tion al Un it UHF 7640 Main Board TOP View UHF 7640 Main Board Schematic VHF/UHF Front Unit Board Bottom View VHF/UHF Front Unit Board TOP View VHF/UHF Front Unit Schematic UHF 7640 Transistor Basing Diagrams