DAEWOO AKF-3805V Service Manual

Service Manual

A UT OST OP CASSETTE

PLAYER ELECTR ONIC

TUNER (FM/MW)

Model : AKF-3805V

D AEWOO ELECTRONICS CO., LTD.

O VERSEAS SER VICE DEPT.

2. LINE DRAWING

11. GENERAL SPECIFICATIONS.......................................1

12. LINE DRAWING.............................................................1

13. PANEL INFORMATIONS..............................................2

14. CONNECTIONS.............................................................3

15. OPERATIONS.................................................................3

16. PERFORMANCE SPECIFICATIONS............................4

17. SCHEMATIC DIAGRAM...............................................7

18. PCB PATTERN...............................................................8

19. CONFIGURATIONS AND DESCRIPTIONS..............10

10. EXPLODED VIEW AND DESCRIPTIONS..................18

11. DECK MECHANISM EXPLODED VIEW AND

PARTS LIST .................................................................19

12. IC BLOCK AND DESCRIPTIONS ...............................20

13. PART LIST....................................................................21

GENERAL SPECIFICA TIONS

POWER SUPPLY ...........................13.8V (10.8~15.6V allowable)

SPEAKER IMPEDANCE................4 or 8 ohm

OUT POWER..................................MAXIMUM 7Wx2CH

TUNER FM MW

SENSITIVITY..................................10dBµ 25dBµ

STEREO SEPARATION.................30dBµ

SIGNAL TO NOISE RATIO...........60dB 50dB

FREQUENCY RANGE...................87.5~108MHz 522~1620KHz

INTERMEDIATE FREQUENCY.....10.7MHz 450KHz

CASSETTE PLAYER

WOW AND FLUTTER...................0.35 (JIS RMS)

SIGNAL TO NOISE RATIO...........50dB

CHANNEL SEPARATION.............40dB

FREQUENCY RESPONSE............63~10KHz (±3dB)

TAPE SPEED..................................4.75cm/sec

T ABLE OF CONTENTS 1. GENERAL SPECIFICA TIONS

ANT JACK

20P MINI CONNECTOR

REAR SIDE

TOP SIDE

BND

PLL SYNTHESIZER

TONE

TUN

BAL VOL

ON/

OFF

63 4

197 8 5

AUTO STOP SYSTEM

COM1 COM1 AM2 LW FM2 1C 2B 2G 2C COL 3B 3G 3C P

AM1 MW FM1 1B 2F 2E 2D 2A 3F 3E 3D 3A

1AD

COM2 COM2

COM1

COM2

123456789101112131415

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

4B 4G 4C

4F 4E 4D 4A

LOUD

50 CH PM

AM 5A

5B 5G 5C

5F 5E 5D LOC MO

3. P ANEL INFORMATION

P ANEL

FRONT SIDE

DISPLAY

BND

AUTO STOP SYSTEM

PLL SYNTHESIZER

TONE

TUN

BAL VOL

ON/

OFF

1. OFF/VOL (V olume)

Power ON/OFF : The power is turned OFF when the control is

roated counterclockwise as far as it will go ; it is turned ON

when the control is rotated clockwise.

Volume adjustment : When the control is rotated clockwise

past the point at which the power is turned on, the volume

will be increased. Conversely, when it is rotated

counterclockwise, it will be reduced.

2. BALANCE Control

Balance adjustement : The volume balance between the left

and right channels can be adjusted. Rotate it counter-

colckwise then the volume at the right is low or rotate it

clockwise when the volume at the left is lowand adjust the

balance between the left and right channels. Nomally the

control is kept at its center(clickstop) position. After having

performed the adjustment, release the control.

3. EJECT/Fast Forward Switch

Pressing this switch sets the tape to the fast forward mode,

the tape run in the same direction quickly. To release, press

this switch and this will return the tape to normally play back.

Pressing this switch more will cause the tape to be ejected

from the loading slot.

4. Tape Loading Slot

Load the cassette tape with the side of the tape visible to the

right. Once you insert the tape it will automatically start

playing.

5. LCD

6. BAND Switch (FM1, FM2, MW)

Push this button to select desired Radio band FM1, FM2, MW.

7. Manual tuning UP/DOWN

Use manual tuning when stations are too weak to be picked

up by seek tuning.

* Each press of the (T-UP) side of button increases the

frequency in 50kHz steps in the FM band, 9kHz in the MW

band. Pressing the (T-DN) side of button decreases the

frequency, Holding down either side of button changes the

frequency at high speed.

8. PRESET STATION Swtiches (1-6)

A total of 6 MW and 12 FM stations can be preset into the six

preset station switch. When any one of 1 to 6 switch is

pressed for 2 seconds or longer, the frequency currently

being received is written to the preset memory associated

with the switch pressed. When any one of 1 to 6 switch is

pressed for less than 2 seconds, the contents of the preset

memory is called as soon as the switch is released.

9. TONE Control

Set the TONE response by rotating the TONE CONTROL.

Tone control is used to adjust high-frequency quality of the

sound.

Basic operation

1. Turn the unit on by means of the ON/OFF VOLUME control,

and adjust it to obtain the desired volume.

2. Press BAND selector to change the radio mode from FM, to

MW.

3. Press the TUNING button to tune in the desired station.

When this is to the right, the reception requency is

increased, while pressing it to the left reduceds the

reception frequency.

4. Use the volume, BALANCE, TONE controls to adjust the set

to your liking.

• Your set is in the tape playmode if a cassette tape is loaded

into the tape deck.

Memory back-up power supply

This unit is provided with a memory back-up power supply

which functions retain the contents of both the preset station

memory, which is used to store the preset stations, and the

last station memory. Which is used to store the station which

was tuned in before the Power was switched off.

5. OPERA TIONS

4. CONNECTIONS

Antenna cord: To vehicle’s antenna

Green

Green/Black

Line

Violet/Black

Line

Violet

+– +–

Left speaker Right speaker

Power antenna cord (blue)

Ground cord (black)

Power supply cord (red)

Ignition key

Memory back-up power cord (yellow)

§ FM SECTION SPECIFICA TION

6. PERFORMANCE SPECIFICA TIONS

NO PERFORMANCE POSITION UNIT NOMINAL LIMIT REMARK

MIN MHz 87.5 87.5

MIX MHz 108.0 108.0

2 CHANNEL SPACE ALL KHz 50 50

3 INTERMEDIATE FREQUENCY ALL MHz 10.7 10.7±0.3

90.1 MHz dB µ 9 ¡´12

98.1 MHz dB µ 9 ¡´12

106.1 MHz dB µ 9 ¡´12

5 IMAGE REJECTION RATIO 106.1 MHz dB 55 ¡ˆ45

6 IF REJECTION RATIO 90.1 MHz dB 70 ¡ˆ60

7 LIMITING SENSITIVITY (-3dB) 98.1 MHz dB 15 ¡´20

8 AM SUPPRESSION MHz dB 35 ¡ˆ30

MONO 98.1 MHz dB 55 ¡´50

STEREO MHz dB

MONO 98.1 MHz % 0.5 ¡´1

STEREO MHz %

LOW 100 Hz dB 0 ± 3

HIGH 10 KHz dB 0 ± 3

12 STEREO ON SENSITIVITY MHz dB µ 10 ¡´20

STEREO at 34dB µ 98.1 MHz dB 4 ¡´8

13 SEPARATION at 40dB µ 98.1 MHz dB 8 ¡ˆ1

45 KHz DEV. at 50dB µ 98.1 MHz dB 20 ¡ˆ16

14 SEARCH STOP LEVEL 98.1 MHz dB µ 20 20 ± 10

15 LOCAL EFFECT 98.1 MHz dB

16 SK INDICATOR SENSITIVITY MHz dB µ

17 DK OUTPUT LEVEL MHz mV

18 PI SEEK LEVEL MHz dB µ

19 AF SEARCH LEVEL MHz dB µ

20 TA POWER (VR MIN) MHz mV

21 TP INDICATOR ON LEVEL MHz dB µ

22 EON SENSITIVITY MHz dB µ

23 OVERLOAD CAPACITY (THD 10%) MHz dB

24 ALTERNATE CH SENSITIVITY MHz dB

25 NOISE OUPPUT (VR MIN) MHz mV

26 ADACIENT CHANNEL REJECTION 98.1 MHz dB

27 HCC EFFECT (7 KHz) 98.1 MHz dB

DUMMY CONDITION

10 OHM

50 OHM 60 OHM

45 OHM

1 TUNING RANGE

4 USABLE SENSITIVITY

(S/N=30dB)

S/N RATIO

( 60 ) dB INPUT

T.H.D

( 60) dB INPUT

AUDIO FIDELITY

Ref : 1KHz. 50 µs

§ MW SECTION SPECIFICA TION

NO PERFORMANCE POSITION UNIT NOMINAL LIMIT REMARK

MIN KHz 522 522

MAX KHz 1620 1620

2 CHANNEL SPACE KHz KHz 9 9

3 INTERMEDIATE FREQUENCY KHz KHz 450 450 ± 3

603 KHz dB µ 25 ¡´ 30

999 KHz dB µ 25 ¡´ 30

1404 KHz dB µ 25 ¡´ 30

4 IMAGE REJECTION RATION 1404 KHz dB 60 ¡ˆ 50

5 IF REJECTION RATIO 603 KHz dB 65 ¡ˆ 60

6 AGC FIGURE OF MERTIT KHz dB 65 ¡ˆ 45

7 SELECTIVITY ( ± 10 KHz ) KHz dB 95 ¡ˆ40

8 BAND WIDTH (-6dB) KHz KHz 9.5 3~13

9 S/N RATIO (74dBU INPUT) KHz dB 45 ¡ˆ 40

KHz % 0.5 ¡´ 2

KHz %

999 KHz Hz 50 ¡´ 100

KHz 2.2 ¡ˆ 1.8

12 SEARCH STOP LEVEL 999 KHz dB µ 30 30 ± 10

13 LOCAL EFFECT 999 KHz dB

14 OVERLOAD CAPACITY(THD 10%) KHz dB

15 TWEET MODULATION (2¡IF) 900 KHz % 1.0 ¡´ 3

KHz dB µ

17 NOISE OUPPUT (VR MIN) KHz mV

1 TUNING RANGE

10 T.H.D (74dBU INPUT)

AUDIO FIDELITY (-6dB)

400Hz Ref.

USABLE SENSITIVITY

( S/N = 20dB )

MAX SENSITIVITY

(S/N = 6dB)

DUMMY CONDITION

30 OHM

50 OHM 65 PF

15 PF

§ AUDIO SECTION SPEC.

NO PERFORMANCE CONDITION UNIT NOMINAL LIMIT REMARK

1 TAPE SPEED MTT-111 % +1 +3.-1

2 WOW & FLUTTER MTT-111 % 0.15 ¡´0.35

3 T.H.D MTT-118 % 1.5 ¡´3

4 S/N RATIO MTT-112 dB 50 ¡ˆ40

5 SEPARATION MTT-141 dB 40 ¡ˆ30

6 CROSS TALK MTT-121 dB 40 ¡ˆ30

125 Hz FORWARD dB 0 ± 3

8 KHz dB 0 ± 3

63 Hz REVERSE dB

10 KHz dB

VR LEVEL 100Hz dB

500mV 10 KHz dB

BASS 100 Hz dB

9 TONE CONTROL TREBLE 10 KHz dB

HI-CUT 6.3 KHz dB 7 7 ± 5

10 OUTPUT (VR MAX) FM. 1 KHz W 10~5 ¡ˆ5

11 OUTPUT (THD:10%) 45KHz Dev. W 6~4 ¡ˆ 4

VR MIN mV 1 ¡´ 3

VR MAX mV

AM 30% MOD dB – 5 ±3

GAIN RATIO FM 45KHz DEV dB 0 ± 3

( 1 KHz ) TAPE MTT-112B dB 0 0

CDC TCD-782 dB

14 LINE OUT LEVEL VR MAX mV

15 AUX INPUT dB

TUNER FM 1KHz dB 0 ¡´3

CHANNEL TAPE MTT-118 dB 0 ¡´3

BALANCE(L/R) CDC 0dB 1KHz dB 0 ¡´3

LINE OUT 1 KHz dB 0 ¡´3

17 METAL EFFECT dB

18 FADER CONTROL EFFECT dB

19 BALANCE CONTROL EFFECT dB

20 T.H.D CDC 1 KHz %

21 S/N RATIO 1 KHz dB

22 CHANNEL SEP. 1 KHz dB

23 FREQUENCY LOW Hz

24 RESPONSE (-3dB) HIGH KHz

12 HUN & NOISE (MTT-501)

FREQUENCY

7 RESPONSE

Ref . 1 KHz

8 LOUDNESS EFFECT

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