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EFJohnson 764X, 761X service manual 5Beep Tone Level Adjustment, Vhf Adjustments Cont’D

Models: 761X 764X

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Figure 6-5 Beep Tone Level Adjustment

ADJUSTMENT PROCEDURE

VHF ADJUSTMENTS (CONT’D)

3.Connect an RF signal generator to the antenna jack. Set it to the channel frequency with an output mod- ulated with 1 kHz at the following deviation:

Wideband (30 kHz) Models - 3.5 kHz Narrowband (12.5 kHz) Models - 1.75 kHz

4.Scroll to “SQL” on the computer screen and press the adjust keys to lower the displayed number so that the receiver unsquelches (the 1 kHz tone is heard). Also adjust the volume if necessary.

5.Adjust the signal generator output to obtain 8 dB

SINAD.

6.Press the computer adjust keys to increase the dis- played number to the point where the receiver squelches. Then slowly adjust the number down- ward again until the receiver just unsquelches.

6.5.3 BEEP TONE LEVEL

This adjustment sets the volume of the beep tone that is heard when keys are pressed and at other times (if it is enabled). The computer setup used in the pre- ceding steps is not required for this adjustment.

Proceed as follows:

1.Unplug any cable that may be plugged into the microphone jack and locate R60 inside this jack. (see Figure 6-5).

2.Repeatedly press a front panel switch to enable the beep tone and adjust R60 for the desired level.

R60

Beep Tone

Level Adj

Figure 6-5 Beep Tone Level Adjustment

	November 1998
6-7	Part No. 001-7600-001

Image 62

EFJohnson 764X, 761X service manual 5Beep Tone Level Adjustment, Vhf Adjustments Cont’D

Contents

UHF 400-430, 450-470, 490-512MHz 35 Watts 761x VHF 764x UHF Conventional MobileVHF 146-174MHz 45 Watts Part No. Part No.35 Watts VHF 146-174MHz 45 WattsUHF 400-430, 450-470, 470-490,or 490-512MHz 761x VHF 764x UHF CONVENTIONAL FM TWO-WAYRADIO1 GENERAL INFORMATION TABLE OF CONTENTS2 INSTALLATION AND DISASSEMBLY 3 OPERATION7 PARTS LIST TABLE OF CONTENTS CONT’D6 ADJUSTMENT PROCEDURE 5A VHF 7610 CIRCUIT DESCRIPTIONLIST OF FIGURES 8SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTSLIST OF TABLES TABLE OF CONTENTS CONT’D1.7 FACTORY CUSTOMER SERVICE 1.3 PRODUCT WARRANTY1.6 ACCESSORIES SECTION 1 GENERAL INFORMATIONAccessory Table 1-175xx Accessories1.8 FACTORY RETURNS Toll-Free:8001.9 REPLACEMENT PARTS 1.10 INTERNET HOME PAGEPart No. This page intentionally left blankNovember 7610 VHF AND 7640 UHF MOBILE SPECIFICATIONS GENERALNOTES November2.2 TRANSCEIVER INSTALLATION SECTION 2 INSTALLATION AND DISASSEMBLYFigure 2-1Installation Components 2.1 GENERAL2.2.3 INSTALLING MICROPHONE HANGER Figure 2-2Mounting Bracket Installation2.2.2 INSTALLING MOUNTING BRACKET 2.3 POWER CABLE INSTALLATION2.5 ACCESSORY CABLE INSTALLATION Changing 20-AmperePower Cable Fuses2.4 USING AN EXTERNAL SPEAKER DB-9PinFigure 2-4Cover and Front Panel Removal 2.6 TRANSCEIVER DISASSEMBLYFigure 2-5PC Board Screws Figure 2-6Removing PC BoardSetting 5-ToneDeviation 2.7 2-TONE/5-TONEMODULE INSTALLATIONFigure 2-7 2/5-ToneModule Installation 25 kHz Channel Spacing - ±3.5 kHz Figure 3-17600 Front Panel 3.1 FEATURESSECTION 3 OPERATION 3.2 CONTROLS AND DISPLAY 3.3 BASIC OPERATIONDirect Selection - The F1-F4and 3.4 RECEIVING AND PLACING CALLS Function 3.5 PROGRAMMABLE FUNCTIONSTable 3-1Option Key Programmable Functions Key Label1.Press the TONE key and “TON--x”is displayed 3.6 CHANNEL SCAN Part No. 3.6.3 PRIORITY CHANNEL SAMPLINGNovember PROGRAMMING Figure 4-1Programming SetupSECTION 4.1 GENERAL4.4 MENU FLOW 4.2STARTING THE PROGRAM4.3 SPECIAL KEYS AND FUNCTIONS Current - Prints the currently displayed data Description 4.4.7 SETUP MENUParameter Bank SelectParameter RF PWR Auto ResetParameter LockoutLabel DescriptionParameter Parameter DescriptionLabel Parameter Table 4-3DTMF Autodial Screen DescriptionParameter November Table 4-4Continuous Tone Screen DescriptionTable 4-5Scan Function Screen Description Part No.Parameter Table 4-6 2-ToneCode Channel Screen DescriptionDescription ParameterParameter BeepTable 4-7Common Screen Description Parameter Table 4-7Common Screen Description ContinuedTable 4-8Expert Screen Description Description Table 4-8Expert Screen Description Continued4.5 UNIQUE PMR EUROPEAN SCREENS PROGRAMMING 4-17 Figure 4-2Memory Channel Screen PMR ModelsNovember Part No.Part No. This page intentionally left blankNovember 4-18SECTION 5A VHF 7610 CIRCUIT DESCRIPTION 5.1 VHF RECEIVER CIRCUITFigure 5-1Second IF System IC3 VHF 5.2 VHF TRANSMITTER CIRCUIT 5.3 VHF PLL CIRCUIT Figure 5-3PLL Circuit VHF5.2.5 APC CIRCUIT 5.3.1 PLL CIRCUITDescription 5.4 VHF IC PIN DESCRIPTIONSLine PortPort SECTION 5B UHF 7640 CIRCUIT DESCRIPTION 5.5 UHF RECEIVER CIRCUITFigure 5-4Second IF System IC1 UHF 5.6 UHF TRANSMITTER CIRCUIT Figure 5-6PLL Circuit UHF 5.7 UHF PLL CIRCUIT5.7.4 UHF CPU IC1 PORT ALLOCATION 5.7.3 UHF POWER SUPPLY5.7.2 VCO CIRCUIT NovemberNovember 5.7.5 UHF I/O EXPANDER IC12 MAIN UNIT5.7.6 UHF PORT EXPANDER IC13 MAIN UNIT Part No.Figure SECTION 6 ADJUSTMENT PROCEDURETest Setup 6.1 GENERAL6.1.2 TEST CHANNELS Figure 6-3Test Cable SchematicFigure 6-2Screen Display Example 6.1.3 TEST CABLEADJUST /X /Y Table 6-1VHF Test FrequenciesTable 6-2UHF Test Frequencies 6.2 PRELIMINARY SETUP VHF ADJUSTMENTSVHF ADJUSTMENTS 6.3 PLL ADJUSTMENT VHF MODELSVHF ADJUSTMENTS CONT’D Figure 6-4VHF Adjustment Points6.5 RECEIVER ADJUSTMENTS VHF MODELS VHF ADJUSTMENTS CONT’DFigure 6-5Beep Tone Level Adjustment VHF ADJUSTMENTS CONT’D6.7TRANSMITTER ADJUSTMENTS UHF MODELS UHF ADJUSTMENTS6.6 PLL ADJUSTMENT UHF MODELS 6.7.4 DTCS WAVEFORM ADJUST UHF ADJUSTMENTS CONT’DFigure 6-6UHF Adjustment Points 6.8 RECEIVER ADJUSTMENTS UHF MODELS UHF ADJUSTMENTS CONT’D7610 VHF Main Unit SECTION 7 PARTS LISTæçìíýõ9+ôý0$,1ý81,7 HVFULSWLRQHVFULSWLRQ 76105 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ November Part No.HVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ November7610 VHF Main Unit æçéíýõ8+ôý0$,1ý81,77640 UHF Main Unit HVFULSWLRQHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 5HIý1Rï7640 UHF Main Unit HVFULSWLRQHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ November Part No.HVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ November Part No.November 7640 UHF Main UnitHVFULSWLRQ 7-177640 UHF Main Unit 5217ý81,7 õ9+ý$1ý8+ý02/6ôFront Unit All Models 5HIý1RïHVFULSWLRQ Front Unit All ModelsHVFULSWLRQ NovemberChassis Parts æçìíýõ9+ôý&+$66,6ý3$576æçéíýõ8+ôý&+$66,6ý3$576 Front Unit All ModelsNovember VHF 7610 EXPLODED VIEW7-21 Part No.←FOLDOUT VHF Exploded View UHF 7640 EXPLODED VIEWFRONT UNIT VHF 7610 BLOCK DIAGRAMMAIN UNIT VHF 7610 Transistor Basing Diagrams VHF 7610 Diode Basing DiagramsFOLDOUT → VHF 7610 MAIN BOARD BOTTOM VIEWPart No. VHF 7610 MAIN BOARD TOP VIEWNovember VHF 7610 MAIN BOARD SCHEMATIC VHF MAIN UNITPart No. UHF 7640 BLOCK DIAGRAMNovember November FOLDOUT →UHF 7640 MAIN BOARD BOTTOM VIEW J2 T o S p kr UHF 7640 MAIN BOARD TOP VIEWJ4 T o O p tion al Un it J5 T o O p t Ca bleUHF 7640 MAIN BOARD SCHEMATIC VHF/UHF FRONT UNIT BOARD TOP VIEW VHF/UHF FRONT UNIT BOARD BOTTOM VIEWVHF/UHF FRONT UNIT SCHEMATIC FRONT UNITTRANSISTORS AND FETS UHF 7640 Transistor Basing DiagramsUHF 7640 Diode Basing Diagrams • DIODES