Efjohnson 764X Manuale Utente

First PrintingNovember 1998761x (VHF)764x (UHF)Conventional MobileVHF 146-174 MHz45 WattsPart No. 242-7610-0xxUHF 400-430, 450-470, 470-490, 490-512

GENERAL INFORMATION1-5November 1998Part No. 001-7600-0017610 (VHF) AND 7640 (UHF) MOBILE SPECIFICATIONSThe following are general specifications intend

GENERAL INFORMATION1-6November 1998Part No. 001-7600-001NOTES

2-1November 1998Part No. 001-7600-001INSTALLATION AND DISASSEMBLYSECTION 2 INSTALLATION AND DISASSEMBLYFigure 2-1 Installation ComponentsOptional

INSTALLATION AND DISASSEMBLY2-2November 1998Part No. 001-7600-001Figure 2-2 Mounting Bracket InstallationWARNING•Do not mount the transceiver where

INSTALLATION AND DISASSEMBLY2-3November 1998Part No. 001-7600-0012. Route the red and black wires from the transceiver to the battery. Connect the red

INSTALLATION AND DISASSEMBLY2-4November 1998Part No. 001-7600-0012.6 TRANSCEIVER DISASSEMBLYRemoving Bottom Cover and Front Panel1. Remove the bottom

INSTALLATION AND DISASSEMBLY2-5November 1998Part No. 001-7600-0012.7 2-TONE/5-TONE MODULE INSTALLATION2.7.1 INSTALLATION PROCEDURE1. Turn power off a

INSTALLATION AND DISASSEMBLY2-6November 1998Part No. 001-7600-0011. Monitor the transmit signal with a communications monitor. Set it for HPF = Off, L

3-1November 1998Part No. 001-7600-001OPERATIONSECTION 3 OPERATIONFigure 3-1 7600 Front Panel3.1 FEATURES•Up to 32 channels programmable•Multi-tone

OPERATION3-2November 1998Part No. 001-7600-0013.2 CONTROLS AND DISPLAY3.2.1 FRONT PANEL CONTROLSPower Switch () - Press this switch to turn power on

761x (VHF)764x (UHF)CONVENTIONALFM TWO-WAY RADIOVHF 146-174 MHz45 WattsUHF 400-430, 450-470, 470-490, or 490-512 MHz35 WattsCopyright© 1998 by Transcr

OPERATION3-3November 1998Part No. 001-7600-001then ready to be used. To turn power off, press and hold the POWER switch until power turns off.3.3.2 E

OPERATION3-4November 1998Part No. 001-7600-0013.3.7 BANK SELECTTwo banks of up to 16 channels each can be pro-grammed. Only the channels in the curre

OPERATION3-5November 1998Part No. 001-7600-001•Note if the busy indicator ( ) on the front panel is being displayed. If it is not, the channel is not

OPERATION3-6November 1998Part No. 001-7600-0013.5.5 CALL GUARD TONE SELECTIf the transceiver has a key, the Call Guard (CTCSS) tone can be selected

OPERATION3-7November 1998Part No. 001-7600-0013.5.15 SCAN LIST PROGRAMMINGPressing the key changes the scan list sta-tus of the current channel. Re

OPERATION3-8November 1998Part No. 001-7600-001The scan lists are user programmable if the key is available. Pressing this key changes the status of t

4-1November 1998Part No. 001-7600-001PROGRAMMINGFigure 4-1 Programming SetupFemale DB9 Plug To ComputerProgramming Cable(Includes Level Convert. Cir

PROGRAMMING4-2November 1998Part No. 001-7600-001on the disk called ADJ. The use of this program is described in Section 5.These are DOS programs, so W

PROGRAMMING4-3November 1998Part No. 001-7600-0014.4.3 SCREEN MENUNOTE: The Screen menu for PMR (European) models is slightly different than the LMR v

PROGRAMMING4-4November 1998Part No. 001-7600-001in the Screen menu (see Section 4.4.3), Memory Channel screen (see Table 4-1), and DTMF Autodial scree

TABLE OF CONTENTSiiNovember 1998Part No. 001-7600-0011 GENERAL INFORMATION1.1 SCOPE OF MANUAL. . . . . . . . . . . . . . . . . . . .1-11.2 TRANSCEIVER

PROGRAMMING4-5November 1998Part No. 001-7600-001Ch Atr(Channel Attribute)Press (Enter) to display the menu which selects one of the following choices:

PROGRAMMING4-6November 1998Part No. 001-7600-001RF PWR Programs the RF power output for the channel (High, Low1, Low2). This setting can be temporaril

PROGRAMMING4-7November 1998Part No. 001-7600-001Table 4-2 Key and Display Assign Screen DescriptionKEY ASSIGN PARAMETERSThe and F1-F4 option keys

PROGRAMMING4-8November 1998Part No. 001-7600-001ParameterKey LabelDescriptionRF ATT ATTToggles the receive attenuate function on and off (see Section

PROGRAMMING4-9November 1998Part No. 001-7600-001Parameter DescriptionLightEnables or disables the display and key backlight. This programming can be o

PROGRAMMING4-10November 1998Part No. 001-7600-001Table 4-4 Continuous Tone Screen DescriptionDescriptionThe continuous tones programmed in this scre

PROGRAMMING4-11November 1998Part No. 001-7600-001Parameter DescriptionStop TimerWhen Mode 2 or 3 above is programmed (priority scanning), this sets ho

PROGRAMMING4-12November 1998Part No. 001-7600-001Parameter DescriptionBeepEmits (or turns off) the following beeps when receiving a matched 2-tone:Nul

PROGRAMMING4-13November 1998Part No. 001-7600-001Table 4-7 Common Screen DescriptionParameter DescriptionUserPasswordPrograms the password that must

PROGRAMMING4-14November 1998Part No. 001-7600-001Parameter DescriptionPower OnPasswordThis turns the password function on and off. When it is turned o

TABLE OF CONTENTS (CONT’D)iiiNovember 1998Part No. 001-7600-0014.5 UNIQUE PMR (EUROPEAN) SCREENS . .4-15General . . . . . . . . . . . . . . . . . . .

PROGRAMMING4-15November 1998Part No. 001-7600-001Parameter DescriptionEmer SwOn TimerSets the period in seconds that the Emergency function key must b

PROGRAMMING4-16November 1998Part No. 001-7600-001The following screens selected in the preceding Screen menu are unique to PMR models. Refer to on-lin

PROGRAMMING4-17November 1998Part No. 001-7600-0014. Connect the master transceiver to the slave (target) transceiver by plugging the cloning cable int

PROGRAMMING4-18November 1998Part No. 001-7600-001This page intentionally left blank.

5A-1November 1998Part No. 001-7600-001VHF (7610) CIRCUIT DESCRIPTIONNOTE: A VHF transceiver block diagram is located on page 8-1.5.1 VHF RECEIVER CIRC

VHF (7610) CIRCUIT DESCRIPTION5A-2November 1998Part No. 001-7600-001Figure 5-1 Second IF System IC3 (VHF)Figure 5-2 Audio Switching and Amplifier

VHF (7610) CIRCUIT DESCRIPTION5A-3November 1998Part No. 001-7600-001Part of the AF signal from pin 9 of FM IF circuit IC3 is applied to pin 24 of leve

VHF (7610) CIRCUIT DESCRIPTION5A-4November 1998Part No. 001-7600-001Figure 5-3 PLL Circuit (VHF)5.2.5 APC CIRCUITThe APC (Automatic Power Control)

VHF (7610) CIRCUIT DESCRIPTION5A-5November 1998Part No. 001-7600-001The phase detector determines the phase differ-ence between these signals and then

VHF (7610) CIRCUIT DESCRIPTION5A-6November 1998Part No. 001-7600-0015.4.3 VHF I/O EXPANDER IC5 (MAIN UNIT)5.4.4 VHF PORT EXPANDER IC11 (MAIN UNIT)51

TABLE OF CONTENTS (CONT’D)ivNovember 1998Part No. 001-7600-0018 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTSVHF (761x) ModelsBlock Diagram . . . . . . . .

5B-7November 1998Part No. 001-7600-001UHF (7640) CIRCUIT DESCRIPTIONSECTION 5B UHF (7640) CIRCUIT DESCRIPTIONNOTE: The UHF transceiver block diagram

UHF (7640) CIRCUIT DESCRIPTION5B-8November 1998Part No. 001-7600-001Figure 5-4 Second IF System IC1 (UHF)Figure 5-5 Audio Switching and Amplifier

UHF (7640) CIRCUIT DESCRIPTION5B-9November 1998Part No. 001-7600-001Part of the AF signal from pin 9 of FM IF circuit IC1 is applied to pin 24 of leve

UHF (7640) CIRCUIT DESCRIPTION5B-10November 1998Part No. 001-7600-001Figure 5-6 PLL Circuit (UHF)5.6.5 APC CIRCUITThe APC (Automatic Power Control)

UHF (7640) CIRCUIT DESCRIPTION5B-11November 1998Part No. 001-7600-001The phase detector determines the phase differ-ence between these signals and the

UHF (7640) CIRCUIT DESCRIPTION5B-12November 1998Part No. 001-7600-0015.7.5 UHF I/O EXPANDER IC12 (MAIN UNIT)5.7.6 UHF PORT EXPANDER IC13 (MAIN UNIT)

6-1November 1998Part No. 001-7600-001ADJUSTMENT PROCEDUREFigure 6-1 Test SetupProgramming CablePart No. 585-7500-031Test Cable (Fabricated)13.6 Volt

ADJUSTMENT PROCEDURE6-2November 1998Part No. 001-7600-001Figure 6-2 Screen Display ExampleFigure 6-3 Test Cable SchematicDTCS Bal LevelSquelch Lev

ADJUSTMENT PROCEDURE6-3November 1998Part No. 001-7600-001Table 6-1 VHF Test FrequenciesTest ChannelTx/Rx Freq (MHz)PowerCall Guard SquelchBandwidth

ADJUSTMENT PROCEDURE6-4November 1998Part No. 001-7600-001in the upper part of the screen is for the currently selected channel.5. To move the cursor b

1-1November 1998Part No. 001-7600-001GENERAL INFORMATIONSECTION 1 GENERAL INFORMATION1.1 SCOPE OF MANUALThis service manual contains operation, inst

ADJUSTMENT PROCEDURE6-5November 1998Part No. 001-7600-001Figure 6-4 VHF Adjustment Points4. Press (Enter) again to select the second adjust chan-nel

ADJUSTMENT PROCEDURE6-6November 1998Part No. 001-7600-0012. Select the low power channel in the middle of the band (Test Ch. 5 - 160.050 MHz). On the

ADJUSTMENT PROCEDURE6-7November 1998Part No. 001-7600-0013. Connect an RF signal generator to the antenna jack. Set it to the channel frequency with a

ADJUSTMENT PROCEDURE6-8November 1998Part No. 001-7600-001UHF ADJUSTMENTSNOTE: Perform the preliminary setup described in Section 6.2 before proceeding

ADJUSTMENT PROCEDURE6-9November 1998Part No. 001-7600-001Figure 6-6 UHF Adjustment Points6.7.4 DTCS WAVEFORM ADJUST 1. Select the channel on the lo

ADJUSTMENT PROCEDURE6-10November 1998Part No. 001-7600-0016.8 RECEIVER ADJUSTMENTS (UHF MODELS)6.8.1 BANDPASS FILTER ADJUST1. Select the channel on t

7-1November 1998Part No. 001-7600-001PARTS LISTSECTION 7 PARTS LIST5HIý1Rï 'HVFULSWLRQ 3DUWý1Rïæçìíýõ9+)ôý0$,1ý81,7&ííì &HUDPý*50éëðçý&

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GENERAL INFORMATION1-2November 1998Part No. 001-7600-0015:30 PM. Central Time, Monday - Friday. The Customer Service Department can be reached using o

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GENERAL INFORMATION1-3November 1998Part No. 001-7600-001Return Authorization (RA) numbers are not nec-essary unless you have been given one by the Fie

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7-21November 1998Part No. 001-7600-001MP2 (C)MP3 (C)MP2 (F)DS1 (F)EP2 (F)MP1 (F)FRONT UNITW3 (F)J1 (F)MP7 (C)MP1 (C)MP7 (C)MP7 (C)MP4 (M)MP1 (M)MP2 (M

UHF (7640) EXPLODED VIEW7-22November 1998Part No. 001-7600-001← ← ← ← FOLDOUT (VHF Exploded View)

SECTION 8 - SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS5V5V87654321BALREFT4T3T2T1AFDTCSIC5SCKSOPLSTUNLK5Vx1 or x2NWCR5L26.L272nd LoPLLICREFOSCBALREFFM DE

VHF (7610) Transistor Basing Diagrams VHF (7610) Diode Basing Diagrams8-2November 1998Part No. 001-7600-001

GENERAL INFORMATION1-4November 1998Part No. 001-7600-001This page intentionally left blank.

8-3November 1998Part No. 001-7600-001VHF (7610) MAIN BOARD BOTTOM VIEWFOLDOUT →

8-4November 1998Part No. 001-7600-001VHF (7610) MAIN BOARD TOP VIEW

8-5November 1998Part No. 001-7600-001VHF (7610) MAIN BOARD SCHEMATIC15.3MHz3.6V2.2VRX:1.2VRX:0VRX:0.63VRX:4.7VRX:0V7.7VTX:0VRX:5.0VTX:5.0VRX:0V13.2V5.

8-6November 1998Part No. 001-7600-001FORREVD1T8VR8VQ1Q2RFATTT1T2D3,D4,D5D7D8R8VR8VQ3Q4D13N/WSWN/WSWN/WSWT3T4D9D10FI146.35MHzX1FI2FI3NWCD12Q5DETAFOUTIC

8-7November 1998Part No. 001-7600-001UHF (7640) MAIN BOARD BOTTOM VIEWFOLDOUT →

8-8November 1998Part No. 001-7600-001C194R65R113R112Q17R66R69C92C91MP10D28D16J6W6W6REDBLKC196R173C195C84Q18Q14IC3C81IOC79C101L17C304L19R70C100C80C74IC

8-9November 1998Part No. 001-7600-001UHF (7640) MAIN BOARD SCHEMATIC567891015141312OPT2OPT1AUXMIC INSIG OUTOPV1OPV2OPV3BUSYMIC OUTPTT OUTPTT IN321411O

8-10November 1998Part No. 001-7600-001P2P3P1P0V-DNV-UPDNUPDS4DS3DS2DS5DS7DS6DS8PWRDS9DS1DS10J1DS112R601278J1 (To Microphone)1 - 8V3 - AFO5 - MICE7 - G

8-11November 1998Part No. 001-7600-001LIGHT ON :7.5VLIGHT OFF:5.5V5.0V5.0V4.9V3.9V1.7V5.0V7.6V5.0VMEASUREMENT CONDITIONSDIGITAL MULTIMETER:50kΩ/VDCOSC

8-12November 1998Part No. 001-7600-0012SB1132 R(Symbol: BARB)2SB1143 S 2SC4081 R(Symbol: BR)2SC4215 O(Symbol: QO)2SC4703 SE(Symbol: SE)• TRANSISTORS A