EFJohnson 761X, 764X service manual Controls and Display, Transceiver Back Panel, Basic Operation

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OPERATION

3.2 CONTROLS AND DISPLAY

3.2.1 FRONT PANEL CONTROLS

Power Switch ( ) - Press this switch to turn power on and press and hold it to turn power off. The trans- ceiver may be programmed so that a password must be entered to allow operation. Refer to Section 3.3.2 for more information.

Volume Up/Down Keys ( ) - Adjust the vol- ume level up or down in up to 32 steps. The minimum selectable volume level can be set as described in Section 3.3.3.

Up/Down Keys ( ) - These keys may be pro- grammed to select the next higher or lower channel or for other functions. Refer to the descriptions in Section 3.5 for more information.

Microphone Connector - Connection point for the microphone. Do not connect microphones other than standard microphone P.N. 589-7600-020 and DTMF microphone P.N. 589-7600-022 to this transceiver. The pin assignments could be different and damage to the microphone or transceiver may result.

F1/F2/F3/F4 - These keys can be programmed to con- trol any of the functions described in Section 3.5. Place the applicable included label on the switch to indicate its function.

3.2.2 DISPLAY

Transmit Indicator ( ) - Indicates that the trans- mitter is keyed or the 5-tone code is being sent (if appli- cable). If this indicator is flashing, the internal temperature is high and the transmitter power output is being cut back. Normal operation automatically resumes when the temperature returns to the normal range.

Busy Indicator ( ) - Indicates the currently selected channel is busy (see Section 3.4.4).

Bell Indicator ( ) - Appears or flashes when a 5-tone call is detected that the transceiver is programmed to receive.

Monitor Indicator ( ) - Indicates that the monitor mode is enabled. This mode disables coded squelch control so that all messages occurring on the channel are heard. Refer Section 3.4.4 for more information.

Display - This seven-character display indicates the selected channel, status information, and error condi- tions. If information in this display begins flashing, an error condition is indicated. Two possible causes are a defective antenna or a battery voltage below 8 VDC.

3.2.3 BACK PANEL

External Speaker Jack - Miniature phone jack for connecting an optional 4-8 ohm external speaker. The internal speaker is automatically disabled when a speaker is plugged into this jack.

Antenna Jack - UHF-type jack for connecting the antenna.

DC Power Cable - Connects the transceiver to a nom- inal 12 VDC, negative ground vehicle power source. Refer to Section 2-1for more information.

Accessory Cable - This optional cable is used to con- nect accessories such as a horn alert and modem to the transceiver. Refer to Section 2-1for more information.

Ext Speaker

Antenna

Jack

Jack

DC Power

Optional

Cable

Accessory Cable

 

Transceiver Back Panel

3.3 BASIC OPERATION

3.3.1 TURNING POWER ON AND OFF

When power is turned on by pressing the POWER switch, a tone sounds and an opening mes- sage is displayed if programmed. The transceiver is

November 1998

 

Part No. 001-7600-001

3-2

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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 800Internet Home Replacement PartsThis page intentionally left blank General VHF and 7640 UHF Mobile SpecificationsGeneral Information Transceiver Installation Installation and DisassemblyCable Installation Installing Mounting BracketInstalling Microphone Hanger Power Cable InstallationAccessory Cable Installation Power Cable FusesChanging 20-Ampere Power Cable Fuses Using AN External SpeakerRemoving PC Board Transceiver DisassemblyRemove shield E 2 2-TONE Programming 2-TONE/5-TONE Module InstallationInstallation Procedure Setting 5-Tone DeviationInstallation and Disassembly Operation FeaturesTransceiver Back Panel Controls and DisplayBasic Operation Direct Selection The F1-F4 Receiving and Placing Calls Function Key Label Description Section No TIME-OUT TimerProgrammable Functions Option Key Programmable FunctionsChannel Select Monitor Mode SelectOutput Power Select Call Guard Tone SelectChannel Scan Priority Channel Sampling Programming Software Programming SetupSection Programming Programming CablesFile Menu Starting the ProgramSpecial Keys and Functions Menu FlowModel Menu Screen MenuProgram Menu Print MenuMemory Channel Screen Description LMR Models Setup MenuParameter Description Bank Select Rx/Tx TimerCh Atr FrequencyTone Auto ResetLockout ScanKey Description Key and Display Assign Screen DescriptionKey Description Label Bank/Free RF PowerDtmf Autodial Screen Description SelectionScan Function Screen Description Continuous Tone Screen DescriptionParameter Description Auto CH Stop Timer2-Tone Code Channel Screen Description ResumeStun EXO TimerTimer Auto Tx Auto TxCommon Screen Description Expert Screen Description Unique PMR Screens Unique PMR European ScreensCloning Programming ONE Transceiver with Another Memory Channel Screen PMR Models This page intentionally left blank VHF Receiver Circuit VHF 7610 Circuit DescriptionReceiver Mute Circuit Audio Amplifier CircuitModulation Circuit Power Amplifier ModuleVHF Transmitter Circuit Microphone Amplifier CircuitVHF PLL Circuit APC CircuitPLL Circuit Line Description VHF IC PIN DescriptionsPin Port Description Pin Port Description Name VHF I/O Expander IC5 Main UnitPin VHF Port Expander IC11 Main UnitUHF Receiver Circuit UHF 7640 Circuit DescriptionSecond if System IC1 UHF UHF Transmitter Circuit UHF PLL Circuit PLL Circuit UHFUHF CPU IC1 Port Allocation UHF Power SupplyUHF Port Expander IC13 Main Unit UHF I/O Expander IC12 Main UnitEquipment Grade and Range Adjustment ProcedureTest Setup Suggested Test EquipmentTest Cable Test ChannelsVHF Test Frequencies COMPUTER-AIDED TuningUHF Test Frequencies PLL Adjustment VHF Models VHF AdjustmentsVHF Adjustments Preliminary SetupOutput Power Adjust VHF Adjustments CONT’DFM Deviation Adjust Squelch Adjust Dtcs Waveform AdjustReceiver Adjustments VHF Models Bandpass Filter AdjustBeep Tone Level Beep Tone Level AdjustmentPLL Adjustment UHF Models UHF AdjustmentsTransmitter Adjustments UHF Models UHF Adjustment Points UHF Adjustments CONT’DUHF Adjustments CONT’D Receiver Adjustments UHF Models Æçìíýõ9+ôý0$,1ý81,7 Parts ListÍäç HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ 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 ViewUHF 7640 Exploded View Front Unit Schematic Diagrams and Component LayoutsVHF 7610 Block Diagram Main UnitVHF 7610 Transistor Basing Diagrams Foldout → VHF 7610 Main Board TOP View VHF Main Unit VHF 7610 Main Board SchematicUHF 7640 Block Diagram UHF 7640 Main Board Bottom View J4 T o O p tion al Un it UHF 7640 Main Board TOP ViewUHF 7640 Main Board Schematic VHF/UHF Front Unit Board Bottom View VHF/UHF Front Unit Board TOP ViewVHF/UHF Front Unit Schematic UHF 7640 Transistor Basing Diagrams
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