EFJohnson 761X, 764X VHF/UHF Front Unit Board TOP View, VHF/UHF Front Unit Board Bottom View

EFJohnson 764X, 761X service manual Õéäíðèìëý0+ô Ìèì EFJohnson 761X, 764X service manual 5HIý1Rï EFJohnson 764X, 761X service manual Êëç EFJohnson 761X, 764X service manual Íëëðêäíçðäèë EFJohnson 764X, 761X service manual 4éì 7UDQVLVWRUý7&êçê.ý7ìéæ EFJohnson 761X, 764X service manual 5íæé EFJohnson 764X, 761X service manual 5ìçå 5HVý5-ê*-ýìíéý9ýõìííýNýRKPô EFJohnson 761X, 764X service manual 5217ý81,7 Õ9+ý$1ý8+ý02/6ô EFJohnson 764X, 761X service manual =HQHUý0$åíèìð0ýõ7ô EFJohnson 761X, 764X service manual Æçìíýõ9+ôý&+$66,6ý3$576 EFJohnson 764X, 761X service manual VHF 7610 Exploded View, Front Unit EFJohnson 761X, 764X service manual UHF 7640 Exploded View EFJohnson 764X, 761X service manual Schematic Diagrams and Component Layouts, VHF 7610 Block Diagram, Main Unit, Front Unit EFJohnson 761X, 764X service manual VHF 7610 Transistor Basing Diagrams EFJohnson 764X, 761X service manual Foldout → EFJohnson 761X, 764X service manual VHF 7610 Main Board TOP View EFJohnson 764X, 761X service manual VHF 7610 Main Board Schematic, VHF Main Unit EFJohnson 761X, 764X service manual UHF 7640 Block Diagram EFJohnson 764X, 761X service manual UHF 7640 Main Board Bottom View EFJohnson 761X, 764X service manual UHF 7640 Main Board TOP View, J4 T o O p tion al Un it EFJohnson 764X, 761X service manual UHF 7640 Main Board Schematic EFJohnson 761X, 764X service manual VHF/UHF Front Unit Board TOP View, VHF/UHF Front Unit Board Bottom View EFJohnson 764X, 761X service manual VHF/UHF Front Unit Schematic EFJohnson 761X, 764X service manual UHF 7640 Transistor Basing Diagrams
Page 97

J1 (To Microphone)

 

2 - Clone

4 - PTT

5 - MIC 7 - Hanger

 

 

 

 

1 - 8V 3 - AFO

5 - MICE

7 - GND

 

 

 

 

 

 

2

28

J1

1

7

R60

V-UP

DS10

V-DN

P0

 

 

 

DS1

 

 

1

 

 

 

 

 

DS2

DS3

DS4

DS5

DS7

DS6

 

P1

 

P2

DS9

P3

DS1

 

 

 

 

UP

DS8

DN

PWR

 

 

 

 

 

 

 

 

 

 

 

R51

 

 

 

 

C3

 

 

 

 

 

 

 

100

 

 

 

 

 

 

C2

 

 

 

 

R52

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R53

 

1

 

 

 

 

 

 

 

 

C1

 

 

76

C10

75

W2

R11

VHF/UHF FRONT UNIT BOARD TOP VIEW

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

 

 

 

C15

 

 

 

 

 

 

Q1

 

 

+ +

 

 

 

 

 

C14

 

 

 

 

 

 

 

 

R4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R15

 

 

R14

 

 

 

 

 

 

 

 

 

 

C12

 

IC2

R2

D1

R3

C13

IC3

R61

C79

 

R63

 

C21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C19

R7

X1

L3

 

C73

R8

C18

R5

 

 

D5

C20

R6

C17

 

C16

 

 

R45

 

R43

R44

25

26

IC1

50

51

R33

R34

R35

C4

 

 

 

 

 

 

 

 

 

 

R47

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R12

 

 

C6

 

 

 

 

C8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R16

 

 

 

 

 

 

 

 

 

 

 

 

 

C47

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C7

 

 

 

 

 

Q3

 

 

 

 

 

 

 

 

 

R36

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C36

R28

R25

R24

R27

Q5

C37 ++

R26

C38

R30

C39

R29

R31

D4

R58

C45

R20 C29

C30

 

R69

L1

R57

Q4

 

D2

D3

C34

 

 

C32

R21

R22

 

C35

C65

 

 

 

 

C14

 

 

 

 

 

 

 

 

 

C66

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C11

C77

C72

W1

R65

R66

 

R67

R54

R48

R19

 

R18

R32

C40

C41

C42

R37

D6

Q10

R40

R39

Q7

R41

 

 

R42

 

 

 

 

 

 

 

R68

R49

C82

 

 

 

 

 

 

R55

R59

C27

C28

 

C9 ++

C67

C62

C80

C78

39

 

 

40

 

C55

 

J2

C53

1

2

C64

C63

R46

 

C50

R70

R17

 

 

 

 

 

 

 

 

 

 

 

 

Q6

 

 

 

 

R38

R56

C43

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C44

 

 

 

 

 

 

 

 

 

C22

 

 

C5

 

C56

 

 

 

 

 

 

 

 

 

 

 

C71

C48

C70 C46

C25

R50

 

C33

C69

C26

C54

C61

C60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C49

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C57

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R71

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C52

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J2 (To Main Unit)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

39

37

35

33

31

29

27

25

23

21

19

17

15

13

11

9 -

7 -

5 -

3 -

1 -

 

 

 

 

 

 

- 5V

- AFO

- SI

- OPT3

- OPT2

- OPT1

- OPV3

- OPV2

- OVP1

- PTT

- PTTIN

- DET

- PWON

- EXPTT

- DIMIN

SO

SCK

SO

GND LVIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

38

36

34

32

30

28

26

24

22

20

18

16

14

12

10

8 -

6 -

4 -

2 -

 

 

 

 

 

 

- 8V

- CPU5V

- GND

- OPINT

- OPCS

- BUSY

- BEEPOUT

- TONE

- BEEP

- DTCS

- RFATT

- NOIS

- UNLK

- EXEN

- EXST

- DAST

PLST

VIN

TEMP

MIC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C59

 

 

 

 

 

 

 

C23

 

C24

 

 

 

 

November 1998

Part No. 001-7600-001

C58

VHF/UHF FRONT UNIT BOARD BOTTOM VIEW

8-10

Page 96 Page 98
Image 97 EFJohnson 761X, 764X service manual VHF/UHF Front Unit Board TOP View, VHF/UHF Front Unit Board Bottom View
Page 96 Page 98
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 Accessory 75xx AccessoriesToll-Free 800 Factory ReturnsInternet Home Replacement PartsThis page intentionally left blank General VHF and 7640 UHF Mobile SpecificationsGeneral Information Transceiver Installation Installation and DisassemblyInstalling Microphone Hanger Installing Mounting BracketPower Cable Installation Cable InstallationChanging 20-Ampere Power Cable Fuses Power Cable FusesUsing AN External Speaker Accessory Cable InstallationRemoving PC Board Transceiver DisassemblyRemove shield E Installation Procedure 2-TONE/5-TONE Module InstallationSetting 5-Tone Deviation 2 2-TONE ProgrammingInstallation and Disassembly Operation FeaturesTransceiver Back Panel Controls and DisplayBasic Operation Direct Selection The F1-F4 Receiving and Placing Calls Programmable Functions TIME-OUT TimerOption Key Programmable Functions Function Key Label Description Section NoOutput Power Select Monitor Mode SelectCall Guard Tone Select Channel SelectChannel Scan Priority Channel Sampling Section Programming Programming SetupProgramming Cables Programming SoftwareSpecial Keys and Functions Starting the ProgramMenu Flow File MenuProgram Menu Screen MenuPrint Menu Model MenuMemory Channel Screen Description LMR Models Setup MenuParameter Description Bank Select Ch Atr TimerFrequency Rx/TxLockout Auto ResetScan ToneKey Description Key and Display Assign Screen DescriptionKey Description Label Dtmf Autodial Screen Description RF PowerSelection Bank/FreeScan Function Screen Description Continuous Tone Screen DescriptionParameter Description 2-Tone Code Channel Screen Description Stop TimerResume Auto CHTimer Auto Tx EXO TimerAuto Tx StunCommon 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 CircuitVHF Transmitter Circuit Power Amplifier ModuleMicrophone Amplifier Circuit Modulation CircuitVHF PLL Circuit APC CircuitPLL Circuit Line Description VHF IC PIN DescriptionsPin Port Description Pin VHF I/O Expander IC5 Main UnitVHF Port Expander IC11 Main Unit Pin Port Description NameUHF 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 UnitTest Setup Adjustment ProcedureSuggested Test Equipment Equipment Grade and RangeTest Cable Test ChannelsVHF Test Frequencies COMPUTER-AIDED TuningUHF Test Frequencies VHF Adjustments VHF AdjustmentsPreliminary Setup PLL Adjustment VHF ModelsOutput Power Adjust VHF Adjustments CONT’DFM Deviation Adjust Receiver Adjustments VHF Models Dtcs Waveform AdjustBandpass Filter Adjust Squelch 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 VHF 7610 Block Diagram Schematic Diagrams and Component LayoutsMain Unit Front 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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