VHF 7610 BLOCK DIAGRAM, Main Unit, Front Unit

SECTION 8 - SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS

COMMON LINE

LINE

RX LINE

TX LINE

DATA BUS LINE

RIPPLE

FIL

MAIN UNIT

5V	1	T1			x1 or x2
5V		T1
	2
	2	T2
		T2			REF	PLL
	3				REF	PLL
	3	T3		NWC	OSC	IC
		T3		NWC	OSC	IC
	4	T4
		T4
	5	A/D			REF BAL
	5	REF
		REF				SCK
AF	6					SCK
AF	6					SO
				DISC		SO
	7			DISC		PLST
DTCS	7	BAL	R5	x3		UNLK
DTCS		BAL	R5	x3		UNLK
	8
		IC5			2nd Lo
		IC5		FM DET		BPF
				FM DET		BPF
				IC3		L26.L27
			NOIS
			SD
				CERAMIC	FI3.FI4
				BPF	or FI5
				NWC
		5V			5V	5V
		5V
				IC4a
		AMP			HPF	LIMIT
		IC7a	AF OUT			AMP
		IC7a	AF OUT
		DET			IC8	IC7b
			AMUT		IC8
			AMUT
		5V			AFHPF
		5V
MIC
		AMP
		IC7d	MICOUT	IC4b
		MICIN

LOOP

FIL

IC2 C60.C61

T	E	D
O	X	T
N	T	C
E	O	S
	N
	E

Q10			5V		T5		T5
					T5		T5
VCO	BUFF	BUFF		TX/RX	BUFF		BUFF
VCO	BUFF	BUFF		SW	BUFF		BUFF
				SW
Q7.Q8	Q6		Q4		Q3		Q2
Q7.Q8				D5.D6
D7.D8				D5.D6
D7.D8
L14
	5V
	BUFF				BPF
	Q5				L23.L24
						1 St	LO
		R5			R5	L22
		R5			R5	D20.D21
						D20.D21
		IF		XTAL			BPF
		AMP		BPF			BPF
				BPF	Q13
		Q14			Q13
		Q14
				FI1 or FI2
							T4
				MOD
5V		5V		IC4d
5V		5V
				T5	5V
BUFF		LPF		IC4c	BUFF
				IC4c	IC6d
					IC6d
IC7c			IC6b	AMUT
				AMUT	BEEP
		NWC

AFON

DRIVE

AMP

L21

D18.D19

BPF

AMP

IC10

VCC			FWD
PWR	LPF
AMP	LPF
AMP
IC1	L5
	L5
			REV
	VCC
	APC		RF
	CTRL		DET
	IC6C		D1.D2
	Q17.18	T4
		T4	5V
R5			5V
R5	L20.D17
	L20.D17	L19.D16
		L19.D16
RF	BPF	BPF	ATT
AMP	BPF	BPF	ATT
AMP
Q12			Q35
	T2	T1	RF ATT

AFO

T5C

TMUT

HORNO

AFATT

ANT

D3.D4

D13.D14

L17.L18

LPF

L1.L2.L3

EX.SP

FAN

			MMUT
	CPU5	CPU5
	RESET	EEPROM			SHIFT
	RESET	EEPROM			CTRL
	CPU5			X1	CTRL
	CPU5			X1
	IC2.Q1	IC3			D5,C17
DS1	RESET	ECS SI SO SCK	OSC2	OSC1	CSHIFT
	RESET	ECS SI SO SCK	OSC2	OSC1	CSHIFT

IC1

FRONT UNIT

AFHPF	EXP		SO
AFHPF			SCK
			SCK
			EXST
NWC			EXEN
	IC11	R
	M	R
MMUT	M	M
MMUT	MMUT
	MMUT
	CTRL
	D25
RMUT	RMUT
	RMUT
	CTRL
	D26	J2
OPV1	15	16	SCK

CPU5

	5V
	T5	T5
	T5	SW
		SW

+5 REG

IC9

+5 REG

VCC W7 GND

LCD

	5V
BACK	DIM
LIGHT	CTRL
DS2-DS11	Q3.D6
AF CH U/D.Etc
KEY X8

COM1-COM3

SEG1-SEG32

DIM

CPU

OPT3

OPT2

OPT1

OPV3

OPV2

OPV1

OPINT OPCS BUSY SI SO SCK PLST DAST EXST

		J2
8V	40	39	5V
CPU5V	38	37	AFO
GND	36	35	SI
OPINT	34	33	OPT3
OPCS	32	31	OPT2
BUSY	30	29	OPT1
BEEPOUT 28		27	OPV3
TONE	26	25	OPV2
BEEP	24	23	OPV1
DTCSIN	22	21	PTT
RFATT	20	19	PTTIN

EXTONE

PTTOUT

PTTIN

OPV2	14	17	SI
OPV3	13	18	SO
	12	19	OPINT
OPT3	11	20	OPCS
OPT2	10	21	REM
OPT1	9	X	AFOUT
OPT1	9	22	AFOUT
SIGOUT	8	23	DET
MOWN	7	24	RXMUT
BUSY	NC	25	BEEPOUT
BUSY	6	25	BEEPOUT
	5	26	AFONOP
MICIN	NC	X	MICMUTE
MICIN	4	27	MICMUTE
MICOUT	3	28	HV
	2	29	5V
	1	30	GND

Q28

T5C

		R5
R5		SW

Q27

R5C

	HV
	8V	8V
	8V	REG
		REG

Q36

Q29.Q30

PWON

Q26

PWON

SW2-SW9

POSW

8V CLONE AFO PTT

MIC

HANGER

KR0-KR3

KS0.KS1

POSW

CLIN

CLOUT

CLONE

I/F

HANG

MTONE

DTMF

CTDAO-CTDA2

CTCIN

AMP

EXEN

PWON

RFATT

NOIS

UNLK

PTTIN

EXPTT

DIMIN

LVIN

TEMP

VIN

D/A

R33.R34.R35

R60

BEEP

NOIS	18	17	DET
UNLK	16	15	PWON
EXEN	14	13	EXPTT
EXST	12	11	DIMIN
DAST	10	9	SO
PLST	8	7	SCK
VIN	6	5	SO
TEMP	4	3	LVIN
MIC	2	1	GND

	to MAIN
5V
LPF	DET

		DTCSIN
	5V	TONE
	5V
	BEEP	BEEPOUT
	MUTE	BEEPOUT
	MUTE
	Q10

			OPT
		J1
8V	1	2	5V
CPU5V	3	4	AFO
GND	5	6	SI
OPINT	7	8	OPT3
OPCS	9	10	OPT2
BUSY	11	12	OPT1
BEEPOUT 13		14	OPV3
TONE	15	16	OPV2
BEEP	17	18	OPV1
DTCS	19	20	PTT
RFATT	21	22	PTTIN
NOIS	23	24	DET
UNLK	25	26	PWON
EXEN	27	28	EXPTT
EXST	29	30	DIMIN
DAST	31	32	SO
PLST	33	34	SCK
VIN	35	36	SD
TEMP	37	38	LVIN
MIC	39	40	GND

to FRONT

DIMIN	DIM
	SW
	Q32
HORNO	HORN
	SW
AFO	Q33
DET
IN
IN	SIG
	SW	Q34
EXPTT

DIM

HORN

AFO

DET

PTT

8-1	November 1998
	Part No. 001-7600-001

EFJohnson 764X, 761X service manual VHF 7610 BLOCK DIAGRAM, Main Unit, Front Unit

Models: 761X 764X

MAIN UNIT

FRONT UNIT

VHF (7610) BLOCK DIAGRAM