S/M No : AKF0305EF1
Service Manual
Car Audio Basic, RDS & OIRT Band
MODEL : AKF-0305 Series
AKF-0315 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
Loudness Controls
Local/DX Switch
Detachable Face for Anti-Theft
DAEWOO ELECTRONICS CO., LTD
http://svc.dwe.co.kr |
Mar. 2000 |
TABLE OF CONTENTS
1. |
PRODUCT SPECIFICATIONS ......................................... |
1 |
2. LINE DRAWING ................................................... |
2 |
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3. |
EMERGENCY TROUBLE SHOOT ................................... |
5 |
4. |
ADJUSTMENTS ............................................................... |
9 |
5. |
SCHEMATIC DIAGRAM .................................................. |
14 |
6. PARTS LOCATION ON P.C.BOARD ........................... |
17 |
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7. OVERALL EXPLODED VIEW & PARTS LIST .................. |
23 |
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8. DECK MECHANISM EXPLODED VIEW & PARTS LIST ........... |
25 |
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9. PARTS LIST ....................................................................... |
28 |
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10. FUNCTION OF MICOM IC ............................................... |
30 |
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11. IC BLOCK DIAGRAM ................................................... |
39 |
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12. LIQUID CRYSTAL DISPLAY ......................................... |
46 |
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13. OUTPUT CONNECTION DESCRIPTIONS .......................... |
48 |
1. PRODUCT SPECIFICATIONS
AUDIO SECTION
Maximum output power |
: 35watts per channel into 4 ohms. |
Load impedance |
: 4 ohms |
Total harmonic distortion |
: Less than 10% at 12 watts |
Frequency response |
: 100Hz( + 3dB), 10kHz(-5 + 3dB) |
Control Bass/Treble |
: 10 + 3dB at 100Hz/10kHz |
TAPE SECTION
Track format |
: 2-track / 2-channel system |
Tape speed |
: 4.8cm/sec |
Wow / Flutter |
: 0.35%max. (WRMS) |
Frequency response normal (LH)tape : 63Hz to 10kHz
TUNER SECTION
(FM) Tuning range
Usable Sensitivity(MONO)
Signal to noise ratio (at 60dBu)
(MW) Tuning range
Usable Sensitivity
(LW) Tuning range Usable Sensitivity
GENERAL
Power requirements
Current consumption
Dimension (W x H x D)
Weight(Net)
:87.5 to 108MHz
87.5 to 107.9 at U.S.A
:12dBuV(4uV / 75ohms)
:More than 50dB
:522 to 1620kHz at Europe
530 to 1710kHz at U.S.A
:30dBuV
:144 to 288kHz
:40dBuV
:DC 12.0V / Rated : 14.4V (Usable : 10.8 ~15.6V) Negative ground
:10A Maximum
:178 x 50 x 156 mm
:1.75 kg
Design and specifications are subject to changes for improvements without notice.
1
2. LINE DRAWING
2-1. AKF-0305 Front Side
BASIC
RDS
2
LINE DRAWING
2-2. AKF-0315 Front Side
BASIC
RDS
3
LINE DRAWING
2-3. REAR SIDE
BASIC MODEL
RDS MODEL
RDS+CD CHANGER MODEL
4
3. EMERGENCY TROUBLE SHOOT
3-1. General Function
Yes
No sound from
speakers
A
Yes
Different each channel have output level (Front, Rear, Left, Right)
Treble or Bass
Yes
is low unusually
Yes
L.C.D or L.E.D is not turned off.
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Output connector |
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is missing |
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Output connector |
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is inferior goods |
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No |
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Power IC, Output |
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Yes |
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Socket is inferior |
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goods |
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Balance of front |
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and rear is in one |
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side |
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No |
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Balance of Left, |
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Yes |
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Right is in one |
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side. |
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Balance of Treble |
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Yes |
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or Bass is in one |
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side. |
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Yes |
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Power is not |
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supplied |
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No |
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Output voltage of |
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power IC is little. |
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No |
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LCD or LED is |
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Yes |
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inferior goods. |
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Put exactly output connector in.
Change connector superior
Change IC, Output to superior
Re-adjust Balance |
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Ref. |
Balance = Center |
of front, rear |
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Front:00 / Rear:00 |
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Re-adjust Balance |
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Ref. |
Balance = Center |
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Left:00 / Right:00 |
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of Left, Right |
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Re-adjust Balance |
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Ref. |
Balance = Center |
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Treble:00 / Bass:00 |
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of Treble or Bass |
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Ref. Point A
Change Regulator Ref. Regulator IC output
IC and check Voltage = V output voltage.
Change LCD or Ref. Electrical Parts List
LED to superior L.C.D., L.E.D. goods.
5
EMERGENCY TROUBLE SHOOT
3-2. Tuner Function
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Yes |
No selected the |
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Select exactly |
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Hearing noise |
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broadcasting |
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station |
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frequency. |
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only |
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A |
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CAT-6, 7 etc |
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Tuner Module is |
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Change tuner |
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Ref. |
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module to |
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Electrical Parts List |
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inferior goods. |
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superior goods. |
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Extreme noise in broadcast
Weak separation of FM stereo
Station in
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Yes |
Weak frequency |
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Change to goods of |
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area caused by |
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R.D.S function. |
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B
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No |
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Antenna |
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Put exactly |
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connector is |
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antenna connector |
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missing |
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in his jack |
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Function of auto- |
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Yes |
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Weak frequency |
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Switch |
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Ref. |
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area of FM, AM |
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automatically to |
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switch noise |
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mono mode in |
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reduction |
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weak frequency |
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Yes |
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Yes |
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area |
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No selected the |
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B |
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local stations. |
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R1 |
In case of located Glass Antenna, check if heat wire is cut or not in rear window. |
R1 |
Check Antenna connector part. |
6
EMERGENCY TROUBLE SHOOT
3-3. Tape Function
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No sound from |
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Yes |
Tape is inferior |
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Yes |
Use only superior |
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goods |
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goods |
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speakers |
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A |
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No signal play |
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Put |
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output connector |
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output |
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in. |
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No |
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Tape Deck Macha |
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Deck Mechanism |
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Yes |
Change |
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Ref. |
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ADM-21/22 |
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is inferior goods. |
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superior |
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Yes |
Tape was inserted |
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Yes |
Insert recording |
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Tape is not |
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right side left. |
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part to right side. |
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inserted into |
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No |
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the slot. |
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Tape is cut or |
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Tape is ejected |
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Yes |
Ref. Point A |
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Ref. |
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after being |
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extended |
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inserted. |
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Some program is played back repeatedly
Sound is low or not clear
Yes |
Selected repeat |
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Yes |
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Release RPT |
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Ref. |
Check on L.C.D |
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and press RPT |
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(RPT) function. |
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function |
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button. |
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Yes |
Head is dirty |
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Yes |
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Clean head or |
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pinch roller with |
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cleaner |
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7
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EMERGENCY TROUBLE SHOOT |
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3-4. CDC Function |
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Disc is not |
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Discs are fold in |
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Yes |
Put one disc in |
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magazine slot. |
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magazine slot. |
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inserted. |
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No |
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Magazine is not |
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Insert exactly |
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inserted rightly |
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magazine |
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Yes
No sound
A
Selection time
Yes
is longer than unusually
Inside degree of |
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Yes |
the unit is |
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extreme |
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No |
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Indoor degree is |
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Yes |
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so cold |
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No |
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Yes |
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8Pin connector is |
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missing |
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No |
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Yes |
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Disc is inferior |
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goods |
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No |
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Yes |
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Disc is dirty |
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No |
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Selected PAUSE |
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Yes |
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function |
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No |
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Selected MUTE |
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Yes |
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function |
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No |
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Mechanism is |
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Yes |
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inferior goods |
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Inspect disc for |
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scratches. |
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Turn power off and |
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Ref. |
protective function |
stop operation for |
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is started caused by |
about 1 hour |
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inside degree is |
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extreme. |
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Turn power on |
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and stand by for |
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about 1 hour |
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Put exactly CD-C 8Pin connector in.
Change disc to superior goods
Wipe with cleaning cloth
Release PAUSE function
Release function
Change
superior
Ref. Point A
Ref. DWEC CD-C series AKD-60, 70, 80, 100C
Ref. DWEC CD-C series AKD-60, 70, 80, 100C
8
4. ADJUSTMENTS
4-1. EQUIPMENTS CONNECTIONS
9
ADJUSTMENTS
4-2. TUNER MODULE ADJUSTMENT LOCATIONS
10
ADJUSTMENTS
4-3. AM (MW/LW) ADJUSTMENT METHOD
1.Dummy Antenna Circuit
2.Location of Adjustment Points
Refer to Adjustment Location Page
3.Control Setting
Power Switch .................. |
ON |
Balance/Fader Control |
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Mech. Center |
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Band Switch .................... |
AM |
Treble/Bass Control ........................... |
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Mech. Center |
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Other |
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OFF |
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4. Adjustment Procedure |
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STEP |
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DESCRIPTION |
CONNECTION |
ANTENNA SIGNAL |
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DIAL |
ADJUSTMENT |
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CONTROL |
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522KHz 60dBu |
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Adjust AM OSC |
1 |
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Band Covering |
Figure 1 |
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522KHz |
for 1.2-1.35V(VT) |
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Mod 1000Hz 30% |
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Fig.7 |
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603KHz 30dBu |
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Adjust AM RF1 and |
2 |
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RF-Tracking |
Figure 2 |
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603KHz |
AM RF2 |
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Mod 1000Hz 30% |
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for maximum output |
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Fig.7 |
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1404KHz 30dBu |
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Adjust AM RF1 and |
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RF-Tracking |
Figure 2 |
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1404KHz |
AM RF2 |
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Mod 1000Hz 30% |
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for maximum output |
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Fig.7 |
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4 |
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LW Band Covering |
Figure 1 |
144KHz 60dBu |
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144KHz |
Adjust LW OSC |
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for 1.2-1.35V(VT) |
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Mod 1000Hz 30% |
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Fig.7 |
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220KHz 60dBu |
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Adjust LW RF1 and |
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LW-Tracking |
Figure 2 |
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220KHz |
LW RF2 |
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Mod 1000Hz 30% |
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for maximum output |
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Fig.7 |
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NOTE: When it is U.S.A band instead of 522, 603, 999, 1404kHz is 530, 600, 1000, 1400kHz |
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11
ADJUSTMENTS
4-4. FM ADJUSTMENT METHOD
1.Dummy Antenna Circuit
2.Location of Adjustment Points
Refer to Adjustment Location Page
3.Control Setting
Power Switch ................. |
ON |
Balance/Fader Control |
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Mech. Center |
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Band Switch ................... |
FM |
Treble/Bass Control ......................... |
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Mech. Center |
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Other |
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OFF |
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4. Adjustment Procedure |
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STEP |
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DESCRIPTION |
CONNECTION |
ANTENNA SIGNAL |
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DIAL |
ADJUSTMENT |
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CONTROL |
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98.1MHz 60dBuV |
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Adjust FM DET |
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IF (Zero Volt) |
Figure 3 |
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98.1MHz |
for 0V + 0.03V |
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No Modulation |
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Fig.7 |
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RDS Receiving |
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98.1MHz 42dBuV |
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Adjust RV 108 Page7. |
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Tuner PC Board |
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Figure 4 |
Mod. |
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98.1MHz |
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estimation level |
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1kHz 30% Mono |
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for2.7V=20mV at |
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TP102(IC401 pin 66) |
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98.1MHz 60dBuV |
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Adjust MPX SEP Fig.7 |
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Figure 5 |
Mod. |
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98.1MHz |
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Stereo Separation |
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for maximum separation |
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at Right ch. |
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98.1MHz 35dBuV |
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Adjust Stereo Blend |
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SNC |
Figure 5 |
Mod. |
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98.1MHz |
Fig.7 1dB separation |
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between Left and Right |
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at Right ch. |
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ch. |
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12
ADJUSTMENTS
4-5. TAPE ADJUSTMENT METHOD
NOTE : 1. Clean the playback head before adjustment
2.Prepare the test tape MTT-114 or equivalent
3.Balance, Fader, Bass & Treble ....Center position. Volume adjusted to 2Volts.
STEP |
DESCRIPTION |
TEST TAPE |
CONNECTION |
TEST |
ADJUSTMENT |
ADJUSTMENT |
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POINT |
POINT |
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Head azimuth |
MTT-114N |
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Speaker |
Head azimuth |
Turn the azimuth |
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1 |
Figure 6 |
screw to obtain |
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adjustment |
or equivalent |
Output |
adjustment screw |
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maximum level |
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2 |
Tape Speed |
MTT-114N |
Figure 6 |
Speaker |
Tape Speed |
Adjust for 3010- |
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or equivalent |
Output |
adjustment |
3020Hz |
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Note : dBu uV dBu uV
17 5.0 33 44.6
16 6.31 35 56.2
30 31.6 45 178
NOTE : Antenna signal is used.
1.For Signal Generator with readings in EMF(Open type) add 12dB (6dB for the “Dummy” and 6dB for EMF-reading).
2.For Signal Generator with reading in dBm add 6 dB for “Dummy”
13
Size:A3
5. SCHEMATIC DIAGRAMS
5-1. BASIC Series AKF-0305 / AKF-0315 |
14 |