S e rvice Manual
CAR AUDIO
Model: AKF-8846/8847
DAEWOO ELECTRONICS CO., LT D .
TABLE OF CONTENTS
11. PRODUCT SPECIFICAT I O N S |
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1 |
12. LINE DRAW I N G |
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2 |
13. PANEL INFORMAT I O N |
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3, 4 |
14. ELECTRICAL SPECIFICAT I O N |
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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 |
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1 7 |
19. ELECTRICAL PA RTS LIST |
1 8 |
~ 2 0 |
10. CIRCUIT DIAG R A M |
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2 1 |
1. PRODUCT SPECIFICATIONS
GENERAL SPECIFICAT I O N
P OWER REQU I R E M E N T - GROUND SYSTEM
- OPERATING VO LTAG E
SPEAKER IMPEDA N C E |
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MAX OUTPUT POW E R |
(4 ohm) |
F R E QUENCY RANG |
- FM |
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- MW |
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LW |
U S AVLES SENSITIVITY |
- FM (S/N:30dB) |
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- MW (S/N:20dB) |
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LW (S/N:20dB) |
S/N RAT I O |
- FM |
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- MW |
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LW |
STEREO SEPA R AT I O N |
- FM |
S I Z E |
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W E I G H T |
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CONSUPTION CURRENT
TAPE SPEED
WOW & FLUTTER
S/N RAT I O
C ROSS TA L K
A K F - 8 8 4 6 |
A K F - 8 8 4 7 |
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: NEGATIVE GRO U N D |
N E G ATIVE GRO U N D |
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: 14.4V DC |
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: 4 OHM (4 SPEAKER) |
4 OHM (4 SPEAKER) |
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: 25W x 4CH |
25W x 4CH |
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: 87.5 - 108.0MHz |
87.5 - 108.0MHz |
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: 531 - 1602kHz |
531 - 1602kHz |
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144 - 290kHz |
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: 2µV |
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2µV |
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: 17µV |
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17µV |
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22µV |
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: 55dB |
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5 5 d B |
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: 50dB |
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5 0 d B |
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4 5 d B |
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: 30dB |
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3 0 d B |
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: 178(W) x 52(H) x155(D) |
178(W) x 52(H) x155(D) |
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: 1.6Kg |
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1 . 5 K g ( N E T ) |
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: 10A |
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: 10A |
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: 4.7cm/sec |
4 . 7 c m / s e c |
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: UNDER 0.35% RMS |
UNDER 0.35% RMS |
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: 50dB |
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5 0 d B |
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: 40dB |
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4 0 d B |
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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 )
1
2. LINE DRAWING
F RONT SIDE
REAR SIDE
ANT JAC K |
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H E AT SINK |
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18PIN I/O CONNECTO R |
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1 |
F RONT RIGHT SP(+) 1 0 |
REAR RIGHT SP (-) |
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2 |
REAR RIGHT SP(+) |
1 1 |
ILL. CONTROL VOLT(+V~GND) |
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3 |
ILL. DIM(+B) |
1 2 |
AU TO ANT. B+ |
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4 |
ACC B+ |
1 3 |
- - - |
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5 |
B ACK UP B+ |
1 4 |
N E G ATIVE GRO U N D |
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6 |
- - - |
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1 5 |
- - - |
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7 |
REAR LEFT SP (+) |
1 6 |
- - - |
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8 |
F RONT LEFT SP (+) |
1 7 |
REAR LEFT SP (-) |
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9 |
F RONT RIGHT SP (-) 1 8 |
F RONT LEFT SP (-) |
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2
3. PANEL INFORMATION
F RONT PA N E L
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FAST |
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FORWARD/REWIND & |
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TAPE EJECT BUTTON |
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PROGRAM BUTTONS |
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SCAN SELECT BUTTON |
L.C.D. |
TAPE SLOT |
Program SCAN & AUTO |
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STORE SELECT BUTTON |
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BAND(FM/AM) |
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SELECTION |
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SECURITY |
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BUTTON |
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WARNING LED |
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*OPTION* |
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POWER/SOUND |
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CONTROL |
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BUTTON |
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VOL/BASS/TREBLE |
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FADER/BALANCE |
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SELECT BUTTON |
TUNING UP/DOWN |
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PRESET STATION |
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BUTTONS (NO.1~6) |
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BUTTONS |
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D I S P L AY (AKF-8846)
FM STEREO ON |
LOW BROADCASTING |
I N D I C A T O R |
INDICATOR |
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
PRESET BUTTON NUMBER
METAL TAPE
SELECT INDICATOR
TAPE DIRECTION |
SCAN SELECT |
I N D I C A T O R |
I N D I C A T O R |
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DOLBY SELECT |
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I N D I C A T O R |
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AST SELECT INDICATOR |
FM, AM BAND |
RADIO FREQUENCY/TAPE |
I N D I C A T O R |
PLAY INDICATOR |
3
D I S P L AY (AKF-8847)
FM STEREO ON |
LOW BROADCASTING |
I N D I C A T O R |
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
PRESET BUTTON NUMBER
METAL TAPE
SELECT INDICATOR
TAPE DIRECTION |
SCAN SELECT |
I N D I C A T O R |
I N D I C A T O R |
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DOLBY SELECT |
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I N D I C A T O R |
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AST SELECT INDICATOR |
FM, MW, LW |
RADIO FREQUENCY/TAPE |
BAND |
PLAY INDICATOR |
I N D I C A T O R |
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4
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 |
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1 |
USABLE SENSITIVITY |
90.1 MHz |
d B µ |
5 |
£10 |
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(S/N 30 dB) |
98.1 MHz |
d B u |
5 |
£10 |
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106.1 MHz |
d B u |
5 |
£10 |
2 |
S/N RAT I O |
98.1 MHz |
d B u |
5 5 |
³50 |
3 |
IF REJECTION RAT I O |
90.1 MHz |
d B µ |
8 0 |
³65 |
4 |
MUTING SENSITIVITY |
981 MHz |
d B µ |
7 |
3 ~ 1 5 |
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(60 dBu Ref. -3dB) |
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5 |
F R E QUENCY RESPONCE |
1 0 0 |
d B |
0 |
± 3 |
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(75 uS, P-EMP) |
1 0 K |
d B |
- 1 0 |
+ 3/ -¥ |
6 |
T.H.D (98.1 MHz) |
1 K H z |
% |
0 . 3 |
£ 1.0 |
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(22.5 KHz DEV. ) |
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7 |
AM REJECTION (AM 30%, 60dBu) |
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d B |
5 0 |
³40 |
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 |
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1 K 4 0 d B µ |
d B |
6 |
£12 |
1 0 |
CHANNEL SEPA R AT I O N |
1 K 6 0 d B µ |
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3 0 |
³25 |
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1 0 K 6 0 d B µ |
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2 0 |
£25 |
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• DUMMY CONDITION
5
4-2. AM SPECIFICAT I O N
N O. |
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I T E M |
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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 |
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USABLE SENS |
603 KHz |
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2 4 |
3 0 ( 3 3 ) |
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2 |
(S/N 20 dB ) |
999 KHz |
d B u |
2 4 |
3 0 ( 3 3 ) |
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1404 KHz |
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2 4 |
3 0 ( 3 3 ) |
3 |
MW S/N RAT I O |
999 KHz |
d B |
5 3 |
³45 |
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4 |
IF REJECTION RAT I O |
603 K Hz |
d B |
1 0 0 |
³65 |
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5 |
I M AGE REJECTION |
1404 KHz |
d B |
6 0 |
³50 |
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6 |
AG C. F.O.M |
999 KHz |
d B |
5 8 |
³50 |
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7 |
AUDIO FIDELITY |
L OW |
H z |
6 0 |
£ 130 |
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( - 6 d B ) |
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H I |
K H z |
1 . 7 |
³ 1.2 |
8 |
T.H.D |
999 KH z |
400 Hz |
% |
0 . 5 |
£ 1.5 |
(30% MOD. ) |
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9 |
WHISTLE MODULAT I O N |
2 1 F |
% |
1 . 0 |
£ 3.0 |
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1 0 |
MW SEARCH LOCK SENS. |
999 KHz |
d B u |
3 5 |
2 5 - 4 5 |
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1 1 |
CHANEL BANDW I D T H |
999 KHz |
K Hz |
9 |
5 - 1 3 |
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1 2 |
LW FREQUENCY TUNNING RANGE |
K H z |
1 4 4 - 2 9 0 |
1 4 4 - 2 9 0 |
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USABLE SENSY |
1 6 0 K H z |
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3 0 |
£40 |
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1 3 |
(20dB S/N) |
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210 KHz |
d B u |
3 0 |
£40 |
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260 KHz |
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3 0 |
£40 |
1 4 |
S/N RAT I O |
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210 KHz |
d B |
5 2 |
³40 |
1 5 |
T. H . D. (400 Hz) |
210 KHz |
% |
0 . 5 |
£ 1.5 |
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1 6 |
SEARCH LOCK SENS. |
2 1 0 K H z |
d B u |
3 5 |
2 5 - 4 5 |
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• DUMMY CONDITION
6
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