UHF 7640 Block Diagram | EFJohnson 761X, 764X specs

DET

AFOUT

NWC

N/W

N/W

R8V

R8V

HV

8V

SW

SW

D12

FI3

D13

FI1

D10

D9

D8

D7

Q3

IC11

IC11

IC6C,D

J1

AF

MCF

BPF

BPF

RF

BPF

BPF

AMP

AF

D/A

AF

HPF

AMP

AMP

SW

SW

Q2

IC9

IC4A

IC12

B

Q5

FI2

46.35MHz

RMUT

TXC

5V

N/W

5V

R8V

T4

T3

T2

T1

SW

Q22

J2

H

G

SHIFT

AFHPF

5V

X1

IF

RFATT

RF

1

ATT

AF

SW

AMP

2

BEEP

FM IC

MUTE

Q33

Q1

AFO

Q32

IC1

Q4

LVIN

AMP

2nd

T8V

T8V

AFATT

IC7B

Lo

AFON

D18,D19

NOIS

SD

Q23,D20,D34

TX/RX

YGR

BUFF

SW

AMP

MICOUT

RX

Q21

Q20

MICIN

VCO

N

N

5V

O

O

8V

8V

I

I

Q24

IC7A

IC11

IC11

S

S

TXC

VCO

Q26

I

O

5V

N

U

SW

Q27

MIC

AMP

LIMIT

SUPRA-

AF

AF

MOD

24

T

BUFF

BUFF

LPF

AMP

TTER

SW

SW

A

IC8A

2

23

Q28

Q30

IC8B

T1

MMUT

TXC

TXC

3

21

SIGOUT

T2

D/A

DTCS

TX

VCO

BUFF

Q25,D22,D33

N/W

T3

10

IC12

22

DTCSOUT

TONE

NWC

SW

D21

IC6B

11

14

DTCS

Q35

T4

REF

MOD

8V

5V

8V

TXC

5V

SO

IC10

TMUT

SCK

LOOP

PLL

BUFF

DAST

FIL

IC

L32,L33

HORNO

2nd

Q34

Q29

+5V

AFATT

SO

Lo

BPF

EXP

SCK

45.9MHz

MAIN UNIT

AFHPF

IC13

EXST

REF

8V

EXEN

15.3MHz

NWC

SO

TCXO

DTCSOUT

SCK

X2

MM

PLST

RM

UNLK

R8V

FRONT UNIT

VOLT

VCC

DET

DIMIN

EXPTT

DS2-DS11

Q3

PWON

T8V

8V

RFATT

BACK

LED

TEMP

CPU5

LIGHT

CTRL

DET

DS1

D

N

S

L

V

T

DTCSIN

CONV

I

O

D

V

I

E

LCD

M

I

I

N

M

5V

CTDA0

S

N

P

CPU5V

RMUT

MMUT

Q6

CTDA2

AF,CH U/D,Etc

RM

RMUT

RXMUT

MM

MMUT

MIMUT

SWITCH x8

O

CTRL

CTRL

SCK

P

D24,Q37

D25,Q46

SI

T

SO

J4

OPINT

I

OPCS

O

15

16

BUSY

OPV1

SCK

POSW

OPT1

N

OPV2

14

17

SI

POSW

OPT2

OPV3

13

18

SO

CPU

OPT3

GND

12

19

OPINT

HANG

OPV1

B

OPT3

11

20

OPCS

OPV2

OPT2

10

21

REM

OPV3

U

OPT1

9

22

AFOUT

S

SIGOUT

8

23

DET

CPU5V

RESET

RES

MDWN

7

24

RXMUT

BUSY

6

25

BEEPO

Microphone

IC1

AUX

5

26

AFON

IC2,Q1,D1

MICIN

4

27

MIMUT

MICOUT

3

28

HV

HANG

HANGER

CLIN

PTT

PTTOUT

2

29

5V

PTTIN

CLONE

CLOUT

PTTIN

1

30

GND

I/F

C

8V

PTTIN

Q4,D2

CLONE

C

B

M

D

SHIFT

5V

T

M

T

T

SW

AFO

C

O

M

X1

I

N

F

D5

N

E

MIC

MIC

DET

LPF

OPTION

EE

Q5

PROM

CONV

TONE

IC3

UT-96

BEEP

UT-105

MUTE

Q7

BEEPO

Q10

D3,D4,D5			FOR
			FOR
TX/RX	LPF	LPF		LPF
SW	LPF	LPF		LPF
SW
			REV
	T8V
				D1
	LPT		APC
	LPT		DET
			DET
T8V	VCC			HV
			APC	IC4B
			CTRL	IC4B
				Q17
DRIVE	PWR			Q18
AMP	AMP		T4
Q19	IC5		T4
Q19
		APCV
	VCC
	CPU5V	+5		W6
		REG		W6
		IC3
	HV	POWER	PWON
		SW	PWON
		Q14
		Q15
+8
REG
IC2
R8V	TXC
	TXC
Q10
Q11				COMMON LINE
D15
				LINE
T8V	R8V			RX LINE
	R8V			RX LINE
Q8
Q9	TMUT			TX LINE
D14
+5V				DATA BUS LINE
CTRL	CPU5V
Q12
Q13

	HV
		Q38	HV	J5
			HV	1
	DIMIN	DIM	DIM	1
	DIMIN	DIM	DIM	2
		SW	HORN	2
		SW	HORN	3
				3
			AFO	4
			AFO	5
				5
		Q39	DISC	6
		Q39	DISC	7
				7
	HORNO	HORN	IN	8
	HORNO	HORN	IN	9
		SW		9
		SW	PTT	10
				10
				11
				11
	AFO
	DET
		Q40
	SIGOUT	SIG
		SW
	EXPTT

UHF (7640) BLOCK DIAGRAM	November 1998	8-6
	Part No. 001-7600-001

Image 93

EFJohnson 761X, 764X service manual UHF 7640 Block Diagram

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 Returns Internet Home Replacement Parts This page intentionally left blank General VHF and 7640 UHF Mobile Specifications General Information Transceiver Installation Installation and Disassembly Installing Microphone Hanger Installing Mounting BracketPower Cable Installation Cable Installation Changing 20-Ampere Power Cable Fuses Power Cable FusesUsing AN External Speaker Accessory Cable Installation Transceiver Disassembly Removing PC BoardRemove shield E Installation Procedure 2-TONE/5-TONE Module InstallationSetting 5-Tone Deviation 2 2-TONE Programming Installation and Disassembly Operation Features Controls and Display Transceiver Back PanelBasic Operation Direct Selection The F1-F4 Receiving and Placing Calls Programmable Functions TIME-OUT TimerOption Key Programmable Functions Function Key Label Description Section No Output Power Select Monitor Mode SelectCall Guard Tone Select Channel Select Channel Scan Priority Channel Sampling Section Programming Programming SetupProgramming Cables Programming Software Special Keys and Functions Starting the ProgramMenu Flow File Menu Program Menu Screen MenuPrint Menu Model Menu Setup Menu Memory Channel Screen Description LMR ModelsParameter Description Bank Select Ch Atr TimerFrequency Rx/Tx Lockout Auto ResetScan Tone Key Description Key and Display Assign Screen Description Key Description Label Dtmf Autodial Screen Description RF PowerSelection Bank/Free Continuous Tone Screen Description Scan Function Screen DescriptionParameter Description 2-Tone Code Channel Screen Description Stop TimerResume Auto CH Timer Auto Tx EXO TimerAuto Tx Stun Common Screen Description Expert Screen Description Unique PMR Screens Unique PMR European Screens Cloning Programming ONE Transceiver with Another Memory Channel Screen PMR Models This page intentionally left blank VHF Receiver Circuit VHF 7610 Circuit Description Receiver Mute Circuit Audio Amplifier Circuit VHF Transmitter Circuit Power Amplifier ModuleMicrophone Amplifier Circuit Modulation Circuit APC Circuit VHF PLL CircuitPLL Circuit VHF IC PIN Descriptions Line DescriptionPin Port Description Pin VHF I/O Expander IC5 Main UnitVHF Port Expander IC11 Main Unit Pin Port Description Name UHF Receiver Circuit UHF 7640 Circuit Description Second if System IC1 UHF UHF Transmitter Circuit UHF PLL Circuit PLL Circuit UHF UHF CPU IC1 Port Allocation UHF Power Supply UHF Port Expander IC13 Main Unit UHF I/O Expander IC12 Main Unit Test Setup Adjustment ProcedureSuggested Test Equipment Equipment Grade and Range Test Cable Test Channels COMPUTER-AIDED Tuning VHF Test FrequenciesUHF Test Frequencies VHF Adjustments VHF AdjustmentsPreliminary Setup PLL Adjustment VHF Models VHF Adjustments CONT’D Output Power AdjustFM Deviation Adjust Receiver Adjustments VHF Models Dtcs Waveform AdjustBandpass Filter Adjust Squelch Adjust Beep Tone Level Beep Tone Level Adjustment UHF Adjustments PLL Adjustment UHF ModelsTransmitter Adjustments UHF Models UHF Adjustment Points UHF Adjustments CONT’D UHF Adjustments CONT’D Receiver Adjustments UHF Models Æçìíýõ9+ôý0$,1ý81,7 Parts List Íäç HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ 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 View UHF 7640 Exploded View VHF 7610 Block Diagram Schematic Diagrams and Component LayoutsMain Unit Front Unit VHF 7610 Transistor Basing Diagrams Foldout → VHF 7610 Main Board TOP View VHF Main Unit VHF 7610 Main Board Schematic UHF 7640 Block Diagram UHF 7640 Main Board Bottom View J4 T o O p tion al Un it UHF 7640 Main Board TOP View UHF 7640 Main Board Schematic VHF/UHF Front Unit Board Bottom View VHF/UHF Front Unit Board TOP View VHF/UHF Front Unit Schematic UHF 7640 Transistor Basing Diagrams