Daewoo AKF-0275 Series Service Manual
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Daewoo AKF-0275 Series Service Manual

Daewoo AKF-0275 Series Service Manual

Car audio basic, rds & oirt band
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Service Manual
Car Audio Basic, RDS & OIRT Band
MODEL : AKF-0275 Series
AKF-0285 Series
4-Channel High Power (35W x 4Ch)
Electronic Tuning
Electronic Volume /Bass /Treble /Balance /Fader Controls
Auto Memory/Preset Scan
Repeat/Random/Intro Scan
Local/DX Switch
Loudness & Mute Controls
Flip-Down Detachable Face for Anti-Theft
DAEWOO ELECTRONICS CO., LTD
http://svc.dwe.co.kr
S/M No:AKF0275EF0
Jan. 2000

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Summary of Contents for Daewoo AKF-0275 Series

  • Page 1 S/M No:AKF0275EF0 Service Manual Car Audio Basic, RDS & OIRT Band MODEL : AKF-0275 Series AKF-0285 Series 4-Channel High Power (35W x 4Ch) Electronic Tuning Electronic Volume /Bass /Treble /Balance /Fader Controls Auto Memory/Preset Scan Repeat/Random/Intro Scan Local/DX Switch Loudness & Mute Controls Flip-Down Detachable Face for Anti-Theft DAEWOO ELECTRONICS CO., LTD...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 1. PRODUCT SPECIFICATIONS ........1 2.

  • Page 3: Product Specifications

    1. PRODUCT SPECIFICATIONS 1-1. TECHNICAL SPECIFICATION AUDIO SECTION Maximum output power : 35watts per channel into 4 ohms. Load impedance : 4 ohms Total harmonic distortion : Less than 10% at 12 watts : 100Hz( + 3dB), 10kHz(-5 +3dB) Frequency response TAPE SECTION Track format : 2-track / 2-channel system...

  • Page 4: Line Drawing

    2. LINE DRAWING 2-1. AKF-0275 FRONT SIDE WITHOUT RDS FUNCTION : BASIC WITH RDS FUNCTION : RDS - 2 -...
  • Page 5 LINE DRAWING 2-2. AKF-0285 FRONT SIDE WITHOUT RDS FUNCTION : BASIC WITH RDS FUNCTION : RDS - 3 -...
  • Page 6 LINE DRAWING 2-3. AKF-0275/AKF-0285 REAR SIDE - 4 -...

  • Page 7: Adjustments

    3. ADJUSTMENTS 3-1. CONNECTIONS EQUIPMENTS - 5 -...
  • Page 8 ADJUSTMENTS 3-2. ADJUSTMENT LOCATIONS IN TUNER MODULES - 6 -...
  • Page 9 ADJUSTMENTS 3-3. AM (MW/LW) ADJUSTMENT 1. Dummy Antenna Circuit 2. Location of Adjustment Points Refer to Adjustment Location Page 3. Control Setting Power Switch ... . . ON Balance/Fader Control ....Mech. Center Band Switch .
  • Page 10 ADJUSTMENTS 3-4. FM ADJUSTMENT 1. Dummy Antenna Circuit 2. Location of Adjustment Points Refer to Adjustment Location Page 3. Control Setting Power Switch ... . . ON Balance/Fader Control ....Mech. Center Band Switch .
  • Page 11 ADJUSTMENTS 3-5. TAPE ADJUSTMENT NOTE : 1. Clean the playback head before adjustment 2. Prepare the test tape MTT-144 or equivalent 3. Balance, Fader, Bass & Treble ..Center position. Volume adjusted to 2Volts. TEST ADJUSTMENT STEP DESCRIPTION TEST TAPE CONNECTION ADJUSTMENT POINT POINT...

  • Page 12: Schematic Diagram

    Size:A3 4. SCHEMATIC DIAGRAM 4-1. BASIC Series AKF-0275/0285 - 10 -...
  • Page 13 Size:A3 SCHEMATIC DIAGRAM 4-2. RDS Series AKF-0275/0285 - 11 -...
  • Page 14 Size:A3 SCHEMATIC DIAGRAM 4-3. OIRT Band AKF-0275/0285 - 12 -...

  • Page 15: Parts Location On P.c. Board

    5. PARTS LOCATION ON P.C. BOARD PCB MAIN : AKF-0275/0285 Series PARTS SIDE - 13 -...
  • Page 16 PARTS LOCATION ON P.C. BOARD BOTTOM SIDE - 14 -...

  • Page 17: Overall Exploded View & Parts List

    Size:A3 6. OVERALL EXPLODED VIEW & PARTS LIST 6-1. AKF-0275 BASIC & RDS - 15 -...
  • Page 18 Size:A3 OVERALL EXPLODED VIEW & PARTS LIST 6-2. AKF-0285 BASIC & RDS - 16 -...

  • Page 19: Deck Mechanism Exploded View & Parts List

    7. DECK MECHANISM EXPLODED VIEW & PARTS LIST EXPLODED VIEW - 17 -...
  • Page 20 ADM-22 DECK MECHANISM EXPLODED VIEW & PARTS LIST PARTS LIST PART CODE PART NAME DESCRIPTION 97YM002600 CHASSIS MAIN SUB AS ADM-22 FULL LOGIC DECK 97YM002900 LEVER GEAR LOAD AS ADM-22 FULL LOGIC DECK 97Y0900800 PLATE REVERSE SUS-304 1/2H T0.4 97Y2100400 ARM EJ CAM EGSAFC45R T0.8 97Y2101000...
  • Page 21 ADM-22 DECK MECHANISM EXPLODED VIEW & PARTS LIST PART CODE PART NAME DESCRIPTION 97Y9300200 LABEL REFLECTION ALS T0.05 PI15.8 97Y3001100 SPRING DETECT ARM SWP-B PI0.4 97Y3001200 SPRING HEAD PLATE AWP-B PI0.4 EXTN 97Y0900400 PLATE REVERSE B EGSAFC45R T0.8 97Y2700100 GEAR POWER SMF5030 97Y3001300 SPRING SELECT ARM...

  • Page 22: Parts List

    8. PARTS LIST CAUTION is a recommendable part for essential stock. 8-1. MAIN SECTION DESCRIPTIONS PART NO. DESCRIPTION IC101 RDS demodulator 1SAA6579T- SAA6579T(RDS VERSION) IC301 MOTER DRIVER 1)1LB1641--- LB1641 or DBL2084N(PIN to PIN) 2)1DBL2084N- IC302 IC ISOLATION 1BA3121--- BA3121(When it is CD Changer) IC304 IC CHIP EVR 1LC75372E-...
  • Page 23 PARTS LIST DESCRIPTIONS PART NO. DESCRIPTION CW303 CONNECTOR 97T6220900 SKWB-20-S/P-TT L101 COIL INDUCTOR 5LL568K02K 0.56UH K 02 OPTION DECK DECK MECHAMISM 97T6009100 ADM-22 Q101/103 Q202/302 TZRC106M-- KRC106M Q304/306 Q310/314 Q405 Q102/201 TZRA105M-- KRA105M Q104/105 Q308/311 TZDTC323TS DTC323TSA Q312 Q202/203 TZTC3199Y- KTC3199Y Q401/402 Q301...

  • Page 24: Function Of Micom Ic

    9. FUNCTION OF MICOM IC 9-1. PIN CONFIGURATION - 22 -...
  • Page 25 FUNCTION OF MICOM IC 9-2. PIN DESCRIPTION PIN NAME DESCRIPTION 4.5MHz CRYSTAL XOUT PHASE COMPARISON OUTPUT PORT If the frequency of the partial oscillation is higher than the basic frequency, these output high, lower than the basic frequency, output low. Otherwise, these are high-z that those frequencies correspond. AM 2 nd CHARGE PUMP OUTPUT PORT.
  • Page 26 FUNCTION OF MICOM IC PIN NAME DESCRIPTION DM-21 MAIN MOTOR CONTROL PORT. MTR_ON MTR_FF PLAY : HIGH FF/REW : HIGH HIGH STOP : KEY & LCD DRIVER IC INTERFACE PORTS PE3/SI2 PE2/SO2 PE1/SCK2 DECK EQ IC MUTE ADJUST PORT. EVR IC INTERFACE PORTS. OPTION DIODE MATRIX INPUT.
  • Page 27 FUNCTION OF MICOM IC KEY MATRIX TABLE (W/RDS) : LC75854 RETURN KI 1 (50) KI 2 (51) KI 3 (52) KI 4 (53) KI 5 (54) SOURCE KS 6 (49) T. UP T. DOWN SEEK UP LOUD/LOC KS 5 (48) M1 (AMS) M2 (DOLBY) M3 (RPT)
  • Page 28 FUNCTION OF MICOM IC KEY MATRIX TABLE (W/O RDS) : LC75852E RETURN KI 1 (52) KI 2 (53) KI 3 (54) KI 4 (55) KI 5 (56) SOURCE KS 6 (51) T. UP T. DOWN SEEK UP LOUD KS 5 (50) M1 (AMS) M2 (DOLBY) M3 (RPT)
  • Page 29 FUNCTION OF MICOM IC AREA 1, 2, 3 : W/O RDS Ver. DIODE AREA1 AREA2 AREA3 AREA (D407) (D410) (D413) EUROPE CHINA USA1 USA2 Australia Middle East OIRT - 27 -...

  • Page 30: Ic Block Diagram

    10. IC BLOCK DIAGRAM 10-1. LC75854/LC75852 (IC LCD DRIVER) : IC501 - 28 -...
  • Page 31 IC BLOCK DIAGRAM 10-2. LB1641 (DRIVER) : IC301 10-3. SAA6579T (IC AUDIO) : IC101 - 29 -...
  • Page 32 IC BLOCK DIAGRAM 10-4. HA13158A (IC AUDIO POWER) : IC305 10-5. 24LC16B (IC EEPROM) : IC402 - 30 -...
  • Page 33 IC BLOCK DIAGRAM 10-6. BA3121 (IC ISOLATOR) : IC302 - 31 -...

  • Page 34: Liquid Crystal Display

    11. LIQUID CRYSTAL DISPLAY 11-1. AKF-0275/0285 BASIC (W/O RDS) IC NO LCD NO. 2B,2C 3A,3D COM1 LOUD AUT 1A,1G 1H 2D LOC 3B 2E,2F DISC COM2 1E,1F 1D TRACK IC NO LCD NO. COM1 COM2 IC NO LCD NO. COM1 INT TAPE IN AMS COM1 --- COM2...
  • Page 35 LIQUID CRYSTAL DISPLAY 11-2. AKF-0275/0285 RDS Version IC NO LCD NO. COM1 DOLBY 9B 8A RDM 7B COM2 COM3 AMS 9C COM4 TAPE IN INTRO 9D 9E TRACK 8D 8E DOT 7D 7E DISC 6D IC NO LCD NO. COM1 COM2 COM3 COM4...

  • Page 36: Output Connection Descriptions

    12. OUTPUT CONNECTOR DESCRIPTIONS AKF-0275/0285 BASIC & RDS A. POWER SUPPLY B. 4-SPEAKERS 4. Yellow ... Back-Up Battery + 12V 1. Violet ... Rear Right (+) 5. Blue ... Remote DC + 12V (Power Ant) 2. Violet/Black ... Rear Right (-) 6.
  • Page 37 26PIN ISO CONNECTOR 4. yellow...back-up 1. violet...rear right(+) C OTHERS dc+12v 2. violet/black...rear right(-) 5. black...ground 5. blue...remote 3. gray.../front right(+) 6. orange...12v preamp(+) dc+12v(power ant) 4. gray/black...front right(-) 8. red...preamp R-ch 6. Dimmer(option) 5. white...front left(+) 10. white...preamp L-ch 7.
  • Page 38 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : “DAEWOOELEC” E-mail : G7F00E@web.dwe.co.kr TEL : 82-2-360-7799 FAX : 82-2-360-7877 Mc. Cem edited by...

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