Goldstar ffh-313, ffh-315 Service Manual

INTERNAL BLOCK DIAGRAM OF ICs

LA1831

24	23	22	21	20	19	18	17	16	15	14	13
ALC	AM	AM	AM						DECODER
	OSC	MIX	RF-AMP								STEREO
BUFF				AGC			MUTE				SW

STEREO DRIVE

TRIG

AM

AM

DET

IF

FF

FF

FF

LEVEL

AM/FM

DET

COMP

VCO

IF

PILOT

S-CURVE

BUFF

AM/FM

DET

TUNING

FM

SW

PHASE DET

FM

DRIVE

AM

IF

DET

FM

REG

GND

VCC

1

2

3

4

5

6

7

8

9

10

11

12

KA3082

1

2

3

4

5

6

7

8

9

REC SW

GND

P/B SW CONT

GND

VCC

P/B SW

GND REC SW

KIA6289N

Pre Out

3.3µF

Rec Out

Ch2

100

10kΩ

Ch2

10kΩ

R . R

0.018µF

µF

3.3µF

Vcc

100Ω

Gvc

47µF

9.1kΩ

GV

A

1000

6.8kΩ

180kΩ

1.2µF

µF

180kΩ

B

Gv

300kΩ

Gvo

22

21

20

19

18

17

16

15

1000µF

47µF

150kΩ

Pre IN

Ch1/B

NF

Rec

2.2kΩ

23

A/B

Ch2

14

IN

Rec IN

Ch2/B

1kΩ

Ch2

(Play Rec)

3.3µF

1000pF

Ch2/A

Ch2/A

Vref2

Vref

Vref1

13

ALC

24

Pre IN

Ch2

(Play only)

1kΩ

1MΩ

47µF

Ch1/A

ALC

Pre IN

1

GND

Ch1/A

1kΩ

Ch1

12

Ch1/B

IN

Pre IN

Ch1

Rec

2.2kΩ

Rec IN

2

11

Ch1/B

M/N

Ch1

(Play Rec)

1kΩ

3.3µF

1000pF

3

4

5

6

7

8

9

10

NF

Metal

Pre

Mix

GND1

M/N

REC

NF

180kΩ

Out

Out

Out

Out

10kΩ

180kΩ

Gv

Vcc

100kΩ

Gvo

9.1kΩ

6.8kΩ

Gv

N

47µF

M

47µF

Gvo

1000µF

1000µF

100Ω 0.018µF

3.3µF

150kΩ

Pre Out

Rec Out

Ch1

Ch1

10Ω

3.3µF

10kΩ

- 26 -

KA8301

DRIVER

PRE

LOGIC

1

2

3

4

5

6

7

8

9

10

GND

Vout1

Vz1

Vr

Fin

Rin

Vcc1

Vcc2

Vz2

Vout2

KIA7805 P/PI ~ KIA7824P/PI

1

INPUT

8

9

13

R

R

R

Q8

Q9

4

18

Q16

R

R

R21

Q17

Q14

R12

Q15

Q12

17

11

R

R

5

Q10

2

OUTPUT

R

Q6

Q13

Q5

20

16

R

R

R

Z1

6

Q11

R

1

2

R

R

C1

Q7

19

Q4

R

Q1

Q2

Q3

7

R

10

14

R

R

3

GND

- 27 -

LC7273M
+5V		VREF	FLOUT	CIN		+5V
Vdda					CLOCK	Vddd
				PLL
					RECOVERY
	REFERENCE			(57kHz)
					(1187.5Hz)
	VOLTAGE
						Vssd
Vssa			VREF
		57kHz
MPXIN	ANTIALIASING	BPF	SMOOTHING		DATA	RDDA
		(SCF)			DECODER
	FILTER		FILTER
						RDCL
					RAM	MODE
					(128bit)
			CLK(4.332MHz)			RST
TEST	TEST				RDS-ID	RDS-ID
			OSC		DETECT	READY
			XIN	XOUT

TDA7440D
		MUXOUTL		INL	TREBLE(L)	BIN(L)	BOUT(L)
L-IN1	4		8	9	18	14	15
	100K						RB
L-IN2	5
	100K								27
	6	G	VOLUME		TREBLE	BASS	SPKR ATT			LOUT
L-IN3								LEFT
	100K
L-IN4	7
	100K	0/30dB							21
					I2CBUS DECODER + LATCHES					SCL
	3	2dB STEP							22
R-IN1									20	SDA
										DIG_GND
	100K
R-IN2	2
	100K	G	VOLUME		TREBLE	BASS	SPKR ATT		26	ROUT
	1							RIGHT
R-IN3								VREF
	100K
	28								24	VS
R-IN4		INPUT MULTIPLEXER					SUPPLY		25
										AGND
	100K	+GAIN					RB
			10	11	19	12	13	23
			MUXOUTR	INR	TREBLE(R)	BIN(R)	BOUT(R)	CREF	D98AU883
				- 28 -