DAEWOO AKF-8846, AKF- 8847 Service Manual

S e rvice Manual

CAR AUDIO

Model: A K F - 8 8 4 6 / 8 8 4 7

DAEWOO ELECTRONICS CO., LT D .

TABLE OF CONTENTS

11. PRODUCT SPECIFICAT I O N S 1

12. LINE DRAW I N G 2

13. PANEL INFORMAT I O N 3, 4

14. ELECTRICAL SPECIFICAT I O N 5 ~ 7

15. MICOM PIN CONFIGULATION & DESCRIPTIONS 8 ~ 1 0

16. IC BLOCK DIAGRAM & TERMINAL VO LTAG E 1 1 ~ 1 4

17. PCB PATTERN DIAG R A M 1 5 ~ 1 6

18. OVERALL EXPLODED VIEW & PA RTS LIST 1 7

19. ELECTRICAL PA RTS LIST 1 8 ~ 2 0

10. CIRCUIT DIAG R A M 2 1

1. PRODUCT SPECIFICATIONS

GENERAL SPECIFICAT I O N

A K F - 8 8 4 6 A K F - 8 8 4 7

P OWER REQU I R E M E N T - GROUND SYSTEM : NEGATIVE GRO U N D N E G ATIVE GRO U N D

- OPERATING VO LTAG E : 14.4V DC SPEAKER IMPEDA N C E : 4 OHM (4 SPEAKER) 4 OHM (4 SPEAKER) MAX OUTPUT POW E R (4 ohm) : 25W x 4CH 25W x 4CH F R E QUENCY RANG - FM : 87.5 - 108.0MHz 87.5 - 108.0MHz

- MW : 531 - 1602kHz 531 - 1602kHz

LW :

U S AVLES SENSITIVITY - FM (S/N:30dB) : 2µV 2µV

- MW (S/N:20dB) : 17µV 17µV

LW (S/N:20dB) :

S/N RAT I O - FM : 55dB 5 5 d B

- MW : 50dB 5 0 d B

LW : STEREO SEPA R AT I O N - FM : 30dB 3 0 d B S I Z E : 178(W) x 52(H) x155(D) 178(W) x 52(H) x155(D) W E I G H T : 1.6Kg 1 . 5 K g ( N E T ) CONSUPTION CURRENT : 10A : 10A TAPE SPEED : 4.7cm/sec 4 . 7 c m / s e c WOW & FLUTTER : UNDER 0.35% RMS UNDER 0.35% RMS S/N RAT I O : 50dB 5 0 d B C ROSS TA L K : 40dB 4 0 d B

144 - 290kHz

22µV

4 5 d B

C H A R ACTERISTICS DESCRIPTION

AU TO REVERSE DECK E L E C T RONIC TUNING AU TO MEMORY & PRESET SCAN 25W/CH HIGH POW E R AM/6, FM12 STATION MEMORY M E TAL TAPE PLAN D O L B Y-B NR FUNCTION L C D E L E C T RONIC TONE CONTRO L ( B A S S / T R E B L E ) E L E C T RONIC AUDIO CONTRO L ( FA D E R / B A L A N C E / VO L U M E )

2. LINE DRAWING

F RONT SIDE

REAR SIDE

ANT JAC K 18PIN I/O CONNECTO RH E AT SINK

1 F RONT RIGHT SP(+) 2 REAR RIGHT SP(+) 3 ILL. DIM(+B) 4 ACC B+ 5 B ACK UP B+ 6 - - 7 REAR LEFT SP (+) 8 F RONT LEFT SP (+) 9 F RONT RIGHT SP (-)

1 0 REAR RIGHT SP (-) 1 1

ILL. CONTROL VO LT ( + V ~ G N D ) 1 2 AU TO ANT. B+ 1 3 - - 1 4 N E G ATIVE GRO U N D 1 5 - - 1 6 - - 1 7 REAR LEFT SP (-) 1 8 F RONT LEFT SP (-)

3. PANEL INFORMATION

F RONT PA N E L

TAPE EJECT BUTTON

FAST FORWARD/REWIND & PROGRAM BUTTONS

SCAN SELECT BUTTON

BAND(FM/AM) SELECTION BUTTON

POWER/SOUND CONTROL BUTTON

VOL/BASS/TREBLE FADER/BALANCE SELECT BUTTON

TUNING UP/DOWN BUTTONS

D I S P L AY (AKF-8846)

L . C . D .

TAPE SLOT

Program SCAN & AUTO STORE SELECT BUTTON

SECURITY WARNING LED *OPTION*

PRESET STATION BUTTONS (NO.1~6)

FM STEREO ON I N D I C A T O R

V O L / B A S S / T R E B L E / F A D E R / B ALANCE SELECT I N D I C A T O R

TAPE DIRECTION

I N D I C A T O R

FM, AM BAND I N D I C A T O R

LOW BROADCASTING INDICATOR

PRESET BUTTON NUMBER

METAL TAPE SELECT INDICATOR

SCAN SELECT I N D I C A T O R

DOLBY SELECT I N D I C A T O R

AST SELECT INDICATOR

RADIO FREQUENCY/TAPE PLAY INDICATOR

D I S P L AY (AKF-8847)

FM STEREO ON I N D I C A T O R

V O L / B A S S / T R E B L E / F A D E R / B ALANCE SELECT I N D I C A T O R

TAPE DIRECTION I N D I C A T O R

FM, MW, LW BAND I N D I C A T O R

LOW BROADCASTING I N D I C A T O R

PRESET BUTTON NUMBER

METAL TAPE SELECT INDICATOR

SCAN SELECT I N D I C A T O R

DOLBY SELECT I N D I C A T O R

AST SELECT INDICATOR

RADIO FREQUENCY/TAPE PLAY INDICATOR

4. ELECTRICAL SPECIFICATION

4-1. FM SECTION

N O. I T E M TEST CONDITION U N I T N O M I N A L L I M I T

1 USABLE SENSITIVITY 90.1 MHz d B µ 5 ≤ 1 0

(S/N 30 dB) 98.1 MHz d B u 5 ≤ 1 0

106.1 MHz d B u 5 ≤10 2 S/N RAT I O 98.1 MHz d B u 5 5 ≥ 5 0 3 IF REJECTION RAT I O 90.1 MHz d B µ 8 0 ≥ 6 5 4 MUTING SENSITIVITY

(60 dBu Ref. -3dB)

5 F R E QUENCY RESPONCE 1 0 0 d B 0 ± 3

(75 uS, P-EMP) 1 0 K d B - 1 0 + 3/- ∞

6 T.H.D (98.1 MHz)

(22.5 KHz DEV. ) 7 AM REJECTION (AM 30%, 60dBu) d B 5 0 ≥ 4 0 8 SEARCH LOCK SENS. 98.1 MHz d B µ 20 1 0 ~ 3 0 9 STEREO ON SENSITIVITY 98.1 MHz dBµ 7 3 ~ 1 5

1 0 CHANNEL SEPA R AT I O N 1 K 6 0 d B µ 3 0 ≥ 2 5

981 MHz d B µ 7 3 ~ 1 5

1 K H z % 0 . 3 ≤ 1 . 0

1 K 4 0 d B µ d B 6 ≤ 1 2

1 0 K 6 0 d B µ 2 0 ≤ 2 5

• DUMMY CONDITION

4-2. AM SPECIFICAT I O N

N O. I T E M U N I T N O M I N A L L I M I T

1 MW FREQUENCY TUNNING RANGE K Hz 5 3 1 - 1 6 0 2 5 3 1 - 1 6 0 2

USABLE SENS 603 KHz 2 4 3 0 ( 3 3 ) 2 (S/N 20 dB ) 999 KHz d B u 2 4 3 0 ( 3 3 )

1404 KHz 2 4 3 0 ( 3 3 ) 3 MW S/N RAT I O 999 KHz d B 5 3 ≥ 4 5 4 IF REJECTION RAT I O 603 K Hz d B 1 0 0 ≥ 6 5 5 I M AGE REJECTION 1404 KHz d B 6 0 ≥ 5 0 6 AG C. F. O. M 999 KHz d B 5 8 ≥ 5 0 7 AUDIO FIDELITY L OW H z 6 0 ≤ 1 3 0

( - 6 d B ) H I K H z 1 . 7 ≥ 1 . 2

9 WHISTLE MODULAT I O N 2 1 F % 1 . 0 ≤ 3 . 0

1 0 MW SEARCH LOCK SENS. 999 KHz d B u 3 5 2 5 - 4 5 1 1 CHANEL BANDW I D T H 999 KHz K Hz 9 5 - 1 3 1 2 LW FREQUENCY TUNNING RANGE K H z 1 4 4 - 2 9 0 1 4 4 - 2 9 0

1 3 (20dB S/N) 210 KHz d B u 3 0 ≤ 4 0

1 4 S/N RAT I O 210 KHz d B 5 2 ≥ 4 0 1 5 T. H . D. (400 Hz) 210 KHz % 0 . 5 ≤ 1 . 5 1 6 SEARCH LOCK SENS. 2 1 0 K H z d B u 3 5 2 5 - 4 5

T.H.D 999 KH z 400 Hz

(30% MOD. )

USABLE SENSY 1 6 0 K H z 3 0 ≤ 4 0

260 KHz 3 0 ≤ 4 0

0 . 5 ≤ 1 . 5

• DUMMY CONDITION

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