Daewoo AKF-8846 User manual

Service Manual
CAR AUDIO
Model: AKF-8846/8847
DAEWOO ELECTRONICS CO., LT D .
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TABLE OF CONTENTS
11. PRODUCT SPECIFICATIONS 1
12. LINE DRAWING 2
13. PANEL INFORMATION 3, 4
14. ELECTRICAL SPECIFICATION 5~7
15.MICOM PIN CONFIGULATION & DESCRIPTIONS 8~10
16. IC BLOCK DIAGRAM & TERMINAL VOLTAGE 11~14
17. PCB PATTERN DIAGRAM 15~16
18. OVERALL EXPLODED VIEW & PARTS LIST 17
19. ELECTRICAL PARTS LIST 18~20
10. CIRCUIT DIAGRAM 21
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1
1. PRODUCT SPECIFICATIONS
GENERAL SPECIFICATION
AKF-8846 AKF-8847
POWER REQUIREMENT - GROUND SYSTEM : NEGATIVE GROUND NEGATIVE GROUND
- OPERATING VOLTAGE : 14.4V DC
SPEAKER IMPEDANCE : 4 OHM (4 SPEAKER) 4 OHM (4 SPEAKER)
MAX OUTPUT POWER (4 ohm) : 25W x 4CH 25W x 4CH
FREQUENCY RANG - FM : 87.5 - 108.0MHz 87.5 - 108.0MHz
- MW : 531 - 1602kHz 531 - 1602kHz
LW : _144 - 290kHz
USAVLES SENSITIVITY - FM (S/N:30dB) : 2µV 2µV
- MW (S/N:20dB) : 17µV 17µV
LW (S/N:20dB) : _22µV
S/N RATIO - FM : 55dB 55dB
- MW : 50dB 50dB
LW : _45dB
STEREO SEPARATION - FM : 30dB 30dB
SIZE : 178(W) x 52(H) x155(D) 178(W) x 52(H) x155(D)
WEIGHT : 1.6Kg 1.5Kg(NET)
CONSUPTION CURRENT : 10A : 10A
TAPE SPEED : 4.7cm/sec 4.7cm/sec
WOW & FLUTTER : UNDER 0.35%RMS UNDER 0.35%RMS
S/N RATIO : 50dB 50dB
CROSS TALK : 40dB 40dB
CHARACTERISTICS DESCRIPTION
AUTO REVERSE DECK
ELECTRONIC TUNING
AUTO MEMORY &PRESET SCAN
25W/CH HIGH POWER
AM/6, FM12 STATION MEMORY
METAL TAPE PLAN
DOLBY-B NR FUNCTION
LCD
ELECTRONIC TONE CONTROL(BASS/TREBLE)
ELECTRONIC AUDIO CONTROL(FADER/BALANCE/VOLUME)
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2
2. LINE DRAWING
REAR SIDE
1FRONT RIGHT SP(+)
2 REAR RIGHT SP(+)
3 ILL. DIM(+B)
4 ACC B+
5BACK UP B+
6 - - -
7 REAR LEFT SP (+)
8FRONT LEFT SP (+)
9FRONT RIGHT SP (-)
10 REAR RIGHT SP (-)
11 ILL. CONTROL VOLT(+V~GND)
12 AUTO ANT. B+
13 - - -
14 NEGATIVE GROUND
15 - - -
16 - - -
17 REAR LEFT SP (-)
18 FRONT LEFT SP (-)
FRONT SIDE
ANT JACK 18PIN I/O CONNECTORHEAT SINK
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3
3. PANEL INFORMATION
FRONT PANEL
DISPLAY (AKF-8846)
TAPE EJECT BUTTON
POWER/SOUND
CONTROL
BUTTON
VOL/BASS/TREBLE
FADER/BALANCE
SELECT BUTTON TUNING UP/DOWN
BUTTONS
BAND(FM/AM)
SELECTION
BUTTON
SCAN SELECT BUTTON
PRESET STATION
BUTTONS (NO.1~6)
SECURITY
WARNING LED
*OPTION*
FAST
FORWARD/REWIND &
PROGRAM BUTTONS
Program SCAN & AUTO
STORE SELECT BUTTON
L.C.D. TAPE SLOT
FM STEREO ON
INDICATOR LOW BROADCASTING INDICATOR
PRESET BUTTON NUMBER
METAL TAPE
SELECT INDICATOR
SCAN SELECT
INDICATOR
DOLBY SELECT
INDICATOR
FM, AM BAND
INDICATOR RADIO FREQUENCY/TAPE PLAY INDICATOR
AST SELECT INDICATOR
VOL/BASS/TREBLE/FADER/B
ALANCE SELECT
INDICATOR
TAPE DIRECTION
INDICATOR
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4
DISPLAY (AKF-8847)
FM STEREO ON
INDICATOR LOW BROADCASTING INDICATOR
PRESET BUTTON NUMBER
METAL TAPE
SELECT INDICATOR
SCAN SELECT
INDICATOR
DOLBY SELECT
INDICATOR
FM, MW, LW
BAND
INDICATOR
RADIO FREQUENCY/TAPE
PLAY INDICATOR
AST SELECT INDICATOR
VOL/BASS/TREBLE/FADER/B
ALANCE SELECT
INDICATOR
TAPE DIRECTION
INDICATOR
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5
4. ELECTRICAL SPECIFICATION
4-1. FM SECTION
NO.ITEM TEST CONDITION UNIT NOMINAL LIMIT
1 USABLE SENSITIVITY 90.1 MHz dBµ 5≤10
(S/N 30dB) 98.1 MHz dBu 5≤10
106.1 MHz dBu 5≤10
2 S/N RATIO 98.1 MHz dBu 55 ≥50
3 IF REJECTION RATIO 90.1 MHz dBµ 80 ≥65
4 MUTING SENSITIVITY 981 MHz dBµ 73~15
(60 dBu Ref. -3dB)
5FREQUENCY RESPONCE 100 dB 0±3
(75 uS, P-EMP) 10K dB -10 +3/- ∞
6 T.H.D (98.1 MHz) 1KHz %0.3 ≤1.0
(22.5 KHz DEV.)
7 AM REJECTION (AM 30%, 60dBu) dB 50 ≥40
8 SEARCH LOCK SENS. 98.1 MHz dBµ 20 10~30
9 STEREO ON SENSITIVITY 98.1 MHz dBµ 7 3~15
1K 40dBµ dB 6≤12
10 CHANNEL SEPARATION 1K 60dBµ 30 ≥25
10K 60dBµ 20 ≤25
• DUMMY CONDITION
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6
4-2. AM SPECIFICATION
NO.ITEM UNIT NOMINAL LIMIT
1 MW FREQUENCY TUNNING RANGE KHz531-1602 531-1602
USABLE SENS 603 KHz 24 30(33)
2 (S/N 20 dB) 999 KHz dBu 24 30(33)
1404 KHz 24 30(33)
3 MW S/N RATIO 999 KHz dB 53 ≥45
4 IF REJECTION RATIO 603 KHzdB 100 ≥65
5IMAGE REJECTION 1404 KHz dB 60 ≥50
6 AGC. F.O.M 999 KHz dB 58 ≥50
7 AUDIO FIDELITY LOWHz 60 ≤130
(-6dB) HI KHz 1.7 ≥1.2
8T.H.D 999 KHz 400 Hz %0.5 ≤1.5
(30% MOD.)
9 WHISTLE MODULATION 21F %1.0 ≤3.0
10 MW SEARCH LOCK SENS. 999 KHz dBu 35 25-45
11 CHANEL BANDWIDTH 999 KHz KHz 9 5-13
12 LW FREQUENCY TUNNING RANGE KHz 144-290 144-290
USABLE SENSY 160KHz 30 ≤40
13 (20dB S/N) 210 KHz dBu 30 ≤40
260 KHz 30 ≤40
14 S/N RATIO 210 KHz dB 52 ≥40
15 T.H.D. (400 Hz) 210 KHz % 0.5 ≤1.5
16 SEARCH LOCK SENS. 210KHz dBu 35 25-45
• DUMMY CONDITION
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7
4-3. TAPE & AUDIO SECTION
NO.ITEM TEST CONDITION UNIT NOMINAL LIMIT
1 WOW & FLUTTER MTT-111 %0.15 ≤0.35
(3,000Hz, DIN. WTD.)
2 TAPE SPEED ERROR MTT-111 %+1.0 -1.0,+3.0
(3,000Hz, DIN. WTD.)
3 S/N RATIO MTT-112B dB 50 ≥45
4 T.H.D.MTT-118 %1.0 ≤2.0
5 CHANNEL SEPARATION MTT-141 dB 40 ≥30
6PROGRAM CLOSSTALK MTT-121 dB 40 ≥30
7FREQUENCY RESPONCE 125Hz dB 0±3
Ref. 1KHz 8kHz dB 0±2
8 NOISE LEVEL VR. MIN. mV 1≤3
9 OUTPUT POWER (10% THD.) FM DEV 75KHz, 1KHz W 18 ≥16
10 OUTPUT POWER (MAX) FM DEV 75KHz,1KHz W 20 ≥17
11 BALANCE CONTROL EFFECT FM DEV 22.5KHz,1KHzdB 60 ≥20
12 FADER CONTROL EFFECT FM DEV 22.5KHz,1KHzdB 60 ≥35
13 TONE CONTROL EFFECT BASS 100Hz dB 910±3
TREBLE 10KHz dB 910±3
14 CHANNEL BALANCE FM DEV 22.5KHz, 1KHz dB 0±3
(L / R) MTT-118 1KHz dB 0±3
DEV 22.5KHz,. 1KHz dB 0±3
15 LEVEL BALANCE MOD 30%, 400Hz dB 0±3
MTT-118 1KHz dB 0 0
TUNER
TAPE
FM
AM
TAPE
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8
5. MICOM PIN CONFIGURATION & DESCRIPTIONS
5-1. PIN CONFIGURATIONS (IC305)
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5-2. PORT DESCRIPTION
PIN ASSIGN NAME I/O
25 P_XIN XIN I
24 P_XOUT XOUT O
13 P_PUMP E0 O
26 P_GND GND
58 P_GND GND
14 P_VDD VDD1
18 P_VDD VDD2
16 P_FMVCO VCOH I
15 P_AMVCO VCOL I
12 P_FMIF P1B3/FMIFC I
13 P_AMIF P1B2/AMIFC I
17 P_ACC CE I
29 P_IFREQ P0C1/PWM1 O
17 P_PMUTE P0B2/FCG0 O
18 P_AMUTE P0B1/BEEP1 O
19 P_BEEP P0B0/BEEP0 O
22 P_BAND1 P1C1 O
23 P_BAND2 P1C0 O
31 P_ST P1D3 I
32 P_SD P1D2 I
14 P_M P1V1/ADC1 I
28 P_LO/DX P0C2 O
16 P_POWER P0B3/FCG1 O
21 P_MTL P1C2 O
27 N•C P0C2 O
DESCRIPTION
4.5 MHz CRYSTAL IN/OUT PORT.
PHASECOMPARATOR OUTPLIT PORT.
GND & VDD (+5V)
FM OSC INPUT PORT. RANGE: 0.07~1.5Vrms
AM OSC INPUT PORT. RANGE: 0.07~1.5Vrms
FM IF COUNT INPUT PORT.
RANGE: 10.7MHz±30KHz, Vpp=0.07~1.5Vrms
AM IF COUNT INPUT PORT
RANGE: (MW)450KHz±1KHz(AM)
(LW)450KHz±0.37KHz, Vpp=0.07~1.5Vrms
BACK UP MODE CONTROL PORT.
HIGH INPUT: OPERATION
LOW INPUT: BACK-UP MODE
IF REQUEST PORT .
POWER MUTE PORT, ACTIVE HIGH
AUDIO MUTE PORT, ACTIVE HIGH
BEEP OUTPUT PORT. (FREQUENCY: 2.08KHz)
BAND SELECT PORT.
RESET FM MW LW
BAND1: 0 1 0 0
BAND2: 0 0 0 1
FM STEREO INPUT PORT.
INITIAL: HIGH, STEREO ON: LOW
SIGNAL DETECTION PORT.
INITIAL: LOW ACTIVE: HIGH
SIGNAL METER INPUT PORT.
LOCALMODE - HIGH, DX MODE - LOW
INITIAL: LOW
POWER CONTROL PORT.
POWEROFF - LOW, POWER ON - HIGH
METAL ON/OFF CONTROL PORT
INITIAL: LOW, ACTIVE: HIGH
NO CONNECTION
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PIN ASSIGN NAME I/O
30 P_WLED P0C0/PWM0 O
33 P_TPIN P1D1 I
15 P_FWDIN P1B0/ADC0 I
34 P_FFIN P1D0 I
20 P_DOLBY P1C3 O
10 P_EVR SO P0A1/SO1 O
9 P_EVR CLK P0A2/SCK1 O
11 P_EVR CE P0A0/SI1 O
1 P_RPULR P1A1 I
2 P_RPULL P1A0 I
63 P_RPULS P1A2 I
37 P_COM0 COM0 O
36 P_COM1 COM1 O
35 P_COM2 COM2 O
62 P_SIN0 P0D0/K0 I
61 P_SIN1 P0D1/K1 I
60 P_SIN2 P0D2/K2 I
59 P_SIN3 P0D3/K3 I
57 P_SOUT0 LCD0/KS0 O
56 P_SOUT1 LCD1/KS1 O
55 P_SOUT2 LCD2/KS2 O
54 P_SOUT3 LCD3/KS3 O
53 P_SOUT4 LCD4/KS4 O
52 P_SOUT5 LCD5/KS5 O
51 P_SOUT6 LCD6/KS6 O
50 P_SOUT7 LCD7/KS7 O
49 P_SOUT8 LCD8/KS8 O
48 P_SOUT9 LCD9/KS9 O
47 P_SOUT10 LCD10/KS10 O
46 P_SOUT11 LCD11/KS11 O
45 P_SOUT12 LCD12/KS12 O
44 P_SOUT13 LCD13/KS13 O
43 P_SOUT14 LCD14/KS14 O
42 P_SOUT15 LCD15/KS15 O
41 P_SOUT16 LCD16/P2E0 O
40 P_SOUT17 LCD17/P2F0 O
39 P_SOUT18 LCD18/P2G0 O
38 P_SOUT19 LCD19/P2H0 O
64 INT I
DESCRIPTION
WARNING LED OUT PORT.
ON/OFF TIME: 1SEC
TAPE INSERT/EJECT CHECK PORT.
TAPE FWD/RVS PLAY INPUT PORT.
REVERSE: HIGH, FORWARD: LOW
TAPE PLAY/FF INPUT PORT.
PLAY: LOW, FF: HIGH
DOLBY ON/OFF CONTROL PORT.
INITIAL: LOW, ACTIVE: HIGH
EVR IC INTERFACE PORTS.
ROTARY PULSE INPUT PORT.
COMMON OUTPUT PORT.
LCD, KEY MATRIX & OPTION DIODE INPUT PORT.
LCD, KEY MATRIX & OPTION DIODE OUTPUT PORT.
INTERLOCK PORT
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11
6. IC BLOCK DIAGRAM & TERMINAL VOLTAGE
IC 301 (LA3161)
PIN NO. PIN NAME DESCRIPTION I/O VOLTAGE
1 INPUT R-CH INPUT O 1.3V
2 N.F N. FEED BACK 0.7V
3 OUTPUT R-CH OUTPUT O 2.9V
4 VCC VCC I 10.5V
5 GND GROUND 0V
6 OUTPUT L-CH OUTPUT O 2.9V
7 N.F N. FEED BACK 0.7V
8 INPUT L-CH INPUT I 1.3V
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12
IC 302 (HA12135AF)
PIN NO. PIN NAME DESCRIPTION I/O VOLTAGE
1, 16 REC IN RECODING INPUT I 5.5V
2 VCC POWER I 11V
3, 14 PB IN PLAYBACK INPUT I 5.5V
4 Vref BEEFERENCE VOLTAGE 5.3V
5 NR ON/OFF NR ON/OFF MODE CONTROL I 4.6V/0.4V
6, 11 PB OUT PLAYBACK OUTPUT O 5.4V
7, 10 DET Time constant pin for the level detector 1.2V
8, 9 REC OUTPUT RECORDING OUTPUT 5.5V
12 REC/PB REC/PB¿«CONTROL PORT 0.4V
PB(PLAYBACK)¿œ∞ÊøÏLOW
13 BIAS Reference current input pin for the active filters 0.9V
15 GND GROUND 0V
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13
IC 303 (LC75372E)
PIN NO. PIN NAME VOLTAGE
1, 33 L/R T3 4.3V
2, 32 L/R T2 4.3V
3, 31 L/R T1 4.3V
4, 30 L/R IN 4.3V
5, 29 L/R 10dB OUT 4.3V
6, 28 L/R CT2 4.3V
7, 27 L/R CT1 0.3V
8, 26 L/R 10dB IN 4.3V
9, 25 L/R SELO 4.3V
10, 24 L3/R3 4.3V
11, 23 N.C 0
36, 42 L/R FOUT 4.3V
37, 41 L/R ROUT 4.3V
PIN NO. PIN NAME VOLTAGE
12, 22 L2/R2 4.3V
13, 21 L1/R1 4.3V
14 VDD 9V
15 CE 0V
16 DI 0V
17 CL 0V
18 N.C 0V
19 VSS 0V
20 TEST 0.5V
34, 44 L/R OUT 4.3V
35, 43 L/R FIN 4.3V
38, 40 L/R Vref 4.3V
39 Vref 4.3V
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IC 304 (HA13158)
PIN NO. PIN NAME VOLTAGE
1, 11 F/R L-IN 0
12, 23 F/R R-IN 0
2 STBY 3.3
10 MUTE 4V
6 VCC 14.4V
14, 18 VCC 14.4V
12 SGND 0
PIN NO. PIN NAME VOLTAGE
22 Vref 6.5V
4, 8 PGND 0
16, 20 PGND 0
3, 5 FL-OUT 6.5V
7, 9 RL-OUT 6.5V
15, 17 RR-OUT 6.5V
19, 21 FR-OUT 6.5V
Note: 1. Standby
Power is turned on when a signal of
3.5 V or 0.05 mA is impressed at pin 2.
When pin 2 is open or connected to
GND, standby is tumed on (output off).
2. Muting Muting is turned off
(ourput on) when a signal of 3.5 V or
0.2 mA is impressed at pin 10.
When pin 10 is open or connected to
GND, muting is turned on (output off).
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15
7. PCB PATTERN DIAGRAM
7-1. PCB MAIN (PART’S SIDE, TOP)
7-2. PCB FRONT (PART'S SIDE, TOP)
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7-3. PCB FRONT (PART'S SIDE, BOTTOM)
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8. OVERALL EXPLODED VIEW & PAR
TS LIST
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