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EFJohnson 761X, 764X service manual 2Screen Display Example, 3Test Cable Schematic, Test Channels

Models: 761X 764X

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Figure 6-2 Screen Display Example

ADJUSTMENT PROCEDURE

Supply Voltage

Internal Temp

PLL Lock Voltage

RSSI

DTCS Bal Level

Squelch Level

Selected Channel Info

RF Power Output

FM Deviation

DTCS Balance

Reference Frequency

Rx Bandpass Filter

IC5/IC12 D/A Outputs

Adjusts Current Vol Level

Squelch Level

NOTE: The above values for the various settings are examples only. Because of component tolerances, the optimum setting for each transceiver will probably be different.

Figure 6-2 Screen Display Example

Programming Cable	Pin 2 (Clone)	Pin 4 (PTT)
		Pin 8
		Pin 1
	PTT	To Transceiver
To Computer	Sw	Mic In
To Computer		Pin 7 (Ground)
		Pin 7 (Ground)
	Pin 5 (MICE “+”)	Pin 6 (MIC “–”)

Figure 6-3 Test Cable Schematic

6.1.2 TEST CHANNELS

NOTE: Before programming the test channels, down- load the current programming data in the transceiver and save it to a disk file so that it can be reloaded after the adjustments are complete.

Test channels at the low, middle (VHF only), and high ends of the operating band, and High, Low1, and Low2 RF output power are required to perform the adjustments in this section. These test channels are listed in Tables 6-1and 6-2, and they must be pro- grammed as regular channels using the programming

software described in Section 4. There are no fixed test channels or test modes selectable with this transceiver.

6.1.3 TEST CABLE

The test cable shown Figure 6-3in must be fabri- cated to perform transceiver alignment. This cable is used in place of the adapter cable shown in Figure 4-1.It is required because in addition to connecting the computer to the microphone jack, a transmit audio and keying (PTT) signal must be applied to that jack. If desired, Replication Cable, Part No. 597-2002-200, can be modified to provide the 8-pin modular-style connector required for this test cable.

November 1998
Part No. 001-7600-001	6-2

Image 57

EFJohnson 761X, 764X service manual 2Screen Display Example, 3Test Cable Schematic, Test Channels

Contents

VHF 146-174MHz 45 Watts Part No. 761x VHF 764x UHF Conventional MobileUHF 400-430, 450-470, 490-512MHz 35 Watts Part No.UHF 400-430, 450-470, 470-490,or 490-512MHz VHF 146-174MHz 45 Watts35 Watts 761x VHF 764x UHF CONVENTIONAL FM TWO-WAYRADIO2 INSTALLATION AND DISASSEMBLY TABLE OF CONTENTS1 GENERAL INFORMATION 3 OPERATION6 ADJUSTMENT PROCEDURE TABLE OF CONTENTS CONT’D7 PARTS LIST 5A VHF 7610 CIRCUIT DESCRIPTIONLIST OF TABLES 8SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTSLIST OF FIGURES TABLE OF CONTENTS CONT’D1.6 ACCESSORIES 1.3 PRODUCT WARRANTY1.7 FACTORY CUSTOMER SERVICE SECTION 1 GENERAL INFORMATION1.8 FACTORY RETURNS Table 1-175xx AccessoriesAccessory Toll-Free:8001.10 INTERNET HOME PAGE 1.9 REPLACEMENT PARTSThis page intentionally left blank NovemberPart No. GENERAL 7610 VHF AND 7640 UHF MOBILE SPECIFICATIONSNovember NOTESFigure 2-1Installation Components SECTION 2 INSTALLATION AND DISASSEMBLY2.2 TRANSCEIVER INSTALLATION 2.1 GENERAL2.2.2 INSTALLING MOUNTING BRACKET Figure 2-2Mounting Bracket Installation2.2.3 INSTALLING MICROPHONE HANGER 2.3 POWER CABLE INSTALLATION2.4 USING AN EXTERNAL SPEAKER Changing 20-AmperePower Cable Fuses2.5 ACCESSORY CABLE INSTALLATION DB-9PinFigure 2-5PC Board Screws 2.6 TRANSCEIVER DISASSEMBLYFigure 2-4Cover and Front Panel Removal Figure 2-6Removing PC Board2.7 2-TONE/5-TONEMODULE INSTALLATION Figure 2-7 2/5-ToneModule InstallationSetting 5-ToneDeviation 25 kHz Channel Spacing - ±3.5 kHz 3.1 FEATURES SECTION 3 OPERATIONFigure 3-17600 Front Panel 3.3 BASIC OPERATION 3.2 CONTROLS AND DISPLAYDirect Selection - The F1-F4and 3.4 RECEIVING AND PLACING CALLS Table 3-1Option Key Programmable Functions 3.5 PROGRAMMABLE FUNCTIONSFunction Key Label1.Press the TONE key and “TON--x”is displayed 3.6 CHANNEL SCAN 3.6.3 PRIORITY CHANNEL SAMPLING NovemberPart No. SECTION Figure 4-1Programming SetupPROGRAMMING 4.1 GENERAL4.2STARTING THE PROGRAM 4.3 SPECIAL KEYS AND FUNCTIONS4.4 MENU FLOW Current - Prints the currently displayed data Parameter 4.4.7 SETUP MENUDescription Bank SelectParameter Parameter Auto ResetRF PWR LockoutDescription ParameterLabel Description LabelParameter Table 4-3DTMF Autodial Screen Description ParameterParameter Table 4-5Scan Function Screen Description Table 4-4Continuous Tone Screen DescriptionNovember Part No.Description Table 4-6 2-ToneCode Channel Screen DescriptionParameter ParameterBeep ParameterTable 4-7Common Screen Description Table 4-7Common Screen Description Continued Table 4-8Expert Screen DescriptionParameter Table 4-8Expert Screen Description Continued 4.5 UNIQUE PMR EUROPEAN SCREENSDescription PROGRAMMING November Figure 4-2Memory Channel Screen PMR Models4-17 Part No.November This page intentionally left blankPart No. 4-185.1 VHF RECEIVER CIRCUIT SECTION 5A VHF 7610 CIRCUIT DESCRIPTIONFigure 5-1Second IF System IC3 VHF 5.2 VHF TRANSMITTER CIRCUIT 5.2.5 APC CIRCUIT Figure 5-3PLL Circuit VHF5.3 VHF PLL CIRCUIT 5.3.1 PLL CIRCUITLine 5.4 VHF IC PIN DESCRIPTIONSDescription PortPort 5.5 UHF RECEIVER CIRCUIT SECTION 5B UHF 7640 CIRCUIT DESCRIPTIONFigure 5-4Second IF System IC1 UHF 5.6 UHF TRANSMITTER CIRCUIT 5.7 UHF PLL CIRCUIT Figure 5-6PLL Circuit UHF5.7.2 VCO CIRCUIT 5.7.3 UHF POWER SUPPLY5.7.4 UHF CPU IC1 PORT ALLOCATION November5.7.6 UHF PORT EXPANDER IC13 MAIN UNIT 5.7.5 UHF I/O EXPANDER IC12 MAIN UNITNovember Part No.Test Setup SECTION 6 ADJUSTMENT PROCEDUREFigure 6.1 GENERALFigure 6-2Screen Display Example Figure 6-3Test Cable Schematic6.1.2 TEST CHANNELS 6.1.3 TEST CABLETable 6-1VHF Test Frequencies Table 6-2UHF Test FrequenciesADJUST /X /Y VHF ADJUSTMENTS VHF ADJUSTMENTS6.2 PRELIMINARY SETUP 6.3 PLL ADJUSTMENT VHF MODELSFigure 6-4VHF Adjustment Points VHF ADJUSTMENTS CONT’DVHF ADJUSTMENTS CONT’D 6.5 RECEIVER ADJUSTMENTS VHF MODELSVHF ADJUSTMENTS CONT’D Figure 6-5Beep Tone Level AdjustmentUHF ADJUSTMENTS 6.6 PLL ADJUSTMENT UHF MODELS6.7TRANSMITTER ADJUSTMENTS UHF MODELS UHF ADJUSTMENTS CONT’D Figure 6-6UHF Adjustment Points6.7.4 DTCS WAVEFORM ADJUST UHF ADJUSTMENTS CONT’D 6.8 RECEIVER ADJUSTMENTS UHF MODELSæçìíýõ9+ôý0$,1ý81,7 SECTION 7 PARTS LIST7610 VHF Main Unit HVFULSWLRQHVFULSWLRQ 76105 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ November Part No.HVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7610 VHF Main UnitHVFULSWLRQ November7640 UHF Main Unit æçéíýõ8+ôý0$,1ý81,77610 VHF Main Unit HVFULSWLRQHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ NovemberHVFULSWLRQ 7640 UHF Main UnitHVFULSWLRQ November7640 UHF Main Unit 5HIý1RïHVFULSWLRQ 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.HVFULSWLRQ 7640 UHF Main UnitNovember 7-17Front Unit All Models 5217ý81,7 õ9+ý$1ý8+ý02/6ô7640 UHF Main Unit 5HIý1RïHVFULSWLRQ Front Unit All ModelsHVFULSWLRQ Novemberæçéíýõ8+ôý&+$66,6ý3$576 æçìíýõ9+ôý&+$66,6ý3$576Chassis Parts Front Unit All Models7-21 VHF 7610 EXPLODED VIEWNovember Part No.UHF 7640 EXPLODED VIEW ←FOLDOUT VHF Exploded ViewVHF 7610 BLOCK DIAGRAM MAIN UNITFRONT UNIT VHF 7610 Diode Basing Diagrams VHF 7610 Transistor Basing DiagramsVHF 7610 MAIN BOARD BOTTOM VIEW FOLDOUT →VHF 7610 MAIN BOARD TOP VIEW NovemberPart No. VHF MAIN UNIT VHF 7610 MAIN BOARD SCHEMATICUHF 7640 BLOCK DIAGRAM NovemberPart No. FOLDOUT → UHF 7640 MAIN BOARD BOTTOM VIEWNovember J4 T o O p tion al Un it UHF 7640 MAIN BOARD TOP VIEWJ2 T o S p kr J5 T o O p t Ca bleUHF 7640 MAIN BOARD SCHEMATIC VHF/UHF FRONT UNIT BOARD BOTTOM VIEW VHF/UHF FRONT UNIT BOARD TOP VIEWFRONT UNIT VHF/UHF FRONT UNIT SCHEMATICUHF 7640 Diode Basing Diagrams UHF 7640 Transistor Basing DiagramsTRANSISTORS AND FETS • DIODES