Icom IC-F50, IC-F51 service manual Section Block Diagram, Cpu

	SECTION 10		BLOCK DIAGRAM
				S5V
			Q18:	Q17:
			2SK880	2SC4116
			LVIN	RIPPLE
			BUFF	FIL
		X2
	IC16:	CR–763
	NJM12904	15.3 MHz
BAL
REF	BUFF	TCXO	LOOP	LV
			FIL	IC17:
				TC4S66F
				FAST
	Q19:			SW
	2SC4116	IC4:
		MB15A02

D22:

HVC375B

LV

ADJ

D21:

HVC375B

LV

ADJ

Q15: XP1214

Q16: DTC144EU

Q14: 2SC4226

D19,20: HVC376BVCO SW

RX VCO

Q12:

2SC5107

BUFF

TX VCO

Q11:

Q13:2SC5107 2SC4226

R5V

Q10:D14,D15:

2SC5107MA2S077

TX/RX

BUFF

SW

136–174MHz

MAIN UNIT
Q9:	Q8:	Q7:	D2:	D2: 1SV307
2SC5110	RD01MUS1	RD07MVS1	RB706F	D5: 1SV307
PRE	DRIVE	PWR	PWR	ANT	LPF
DRIVE	AMP	AMP	DET	SW
Q1:			IC2:		D25:
2SK1829			TA75S01F		MA2S111

X 3	PLL	LPF
	IC

IC16:

NJM12904

BUFF

D16,17: HVC376B

D18:

FM 1SV239

MOD

BUFF

ATT	1st LO=
	182.35 MHz–220.35 MHz

RSSI	GATE	APC		MUTE
	CTRL	AMP	T2	SW

2nd LO	IF IC
=45.9 MHz
BPF
	IC1:TA31136FN
	FI2
	X1
	CERAMIC	RSSI	NOIS
	BPF
SQIN	CDBC450CX24
	ALFYM450F=K
DET	450 kHz
	LVA, T1, T2
MOD
D/A
	DET	LPF
	AMP
IC6:
M62363FP	IC11:
	TC4W53FU

MOD

LVA

SCRM

HPF

BLER

Q4:	FI1:		Q3:	D10:
2SC4215	FL–335	1st IF=		HVC350B
IF	XTAL	46.35 MHz	3SK299
				BPF
AMP	BPF
			1st Mixer

	IC13:
	BU4066
EXPANDER	AMP	IC14:	IC15:
		FX214LG	TC3W03FU
	ANALOG	SCRM	1/4
	SW	BLER

D9:		D4:	D8:		TMUT
HVC350B		HVC385B	HVC375B
BPF	RF	BPF	BPF
	AMP			Q26:
	Q2:			TCP6103
	3SK293			VCC	F1
					1	2
T2				POWER
			T1	SW
T2		T1	T2		BATTERY 1	BT1
	IC406:	IC403:	IC405:
	TC7W66FK	NJM12902	TA7368F
SIGNAL			AF VOL

	AF	LPF	AF	AFO	SP1
	MUTE		AMP
TONE	BEEP
			Q401: 2SB1132
			Q402: XP6501
			PWR		Q403: 2SC4116
				AF	Q404: RSR025N03
			CTRL	MUTE	Q405: RSR025N03
					W406: DTC144EU
X3			SPON	SPON

			FM/PM	LPF	LIMIT
			SW		AMP
CTCSS/DTCS
		IC5:
		NJM12902		MSK	BPF
				Modulator
MOD			LPF
	TONE

CTCSS/DTCS DEC
IC5:	IC5:
NJM12902	NJM12902
DET	AMP	CDEC	LPF
LPF		+5V
		R190

IC403:

NJM12902

SENC0–3

LPF

CDEC TEMP SDEC

IC403:

NJM12902

CDCS	CENC0–2
	LPF
	Q408:

COMPRESSOR

MSK	IC10:
DE–Modulator	AK2346

IC7:

X4EW–460

CR–765

3.6864 MHzBATT

SELECT

D404:

X401MA2S077

CR–764

19.6608 MHz SHIFT CSFT

SW

AMP

IC12:

BU4094

EXPANDER

IC410:

BU4094

EXPANDER

				Q21:
				2SA1577
T5C
				T5
R5C				REG
		Q23: 2SB1132
		Q24: XP6501		Q22:
		Q25: DTA144EU		2SA1577
S5C
			S5	R5
VCC			REG	REG
	+5
			REG
			IC9:
			NJM2870

+5V

IC408:

BD5242G

RES RESET +5V

CPU5

IC409:

CR–746
4.00 MHz	IC407:	IC406:
	NJM12904	TC7W66FK	MC1
	AMP	MIC
		MUTE	AFO
T5V
DS402_403
SML–310MT
R5V			PTT
DS404_405
SML–A12MT	Q407: DTA144EU	D401: MA2S111
S5V	Q409: XP4111	D402: MA2S111
+5V	LED	PTT
G	CTRL	DET
			CONNECTOR
			AFO
R
DS406:			MIC
CL–165HR
			PTT
			VCC
	RESET		RESET
	OPTV		OPTV
			CLI CLO

FRONT UNIT

LCD

NOTES :

Voltage line

DTC144EU
FIL	DUSE
SW

CPU

IC401: HD6432264F01TF

24LC64T

EEPROM

Contorol line

Common line

TX line

RX line

DATA lime

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