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MP3/USB PLAYER CAR AUDIO
SERVICE MANUAL
A458 PICTURE
B458 PICTURE
AM/FM STEREO RADIO AND MP3/USB PLAYER
CONTENTS
1. SPECIFICATION ..................................................................... 3
2. DUMMY LOAD ..................................................................... 5
3. HELPFUL HINTS ..................................................................... 6
4. REAR VIEW AND CONNECTION ................................................ 8
5. BLOCK DIAGRAM ..................................................................... 10
6. KEY MATRIX ..................................................................... 12
7. MAIN P.C.BOARD ..................................................................... 13
8. MAIN SCHEMATIC DIAGRAM ................................................ 14
9. FRONT P.C.BOARD ..................................................................... 18
10. FRONT SCHEMATIC DIAGRAM ................................................ 19
11. WIRING CONNECTION ............................................................... 21
12. AM/FM TUNER ........................................................................ 22
13. DECK P.C.BOARD .................................................................. 23
14. DECK SCHEMATIC DIAGRAM ................................................... 24
15. ELECTRICAL PARTS LIST ......................................................... 25
16. EXPLODED VIEW & MECHANICAL PARTS LIST ........................... 35
17. DECK EXPLODED VIEW & PARTS LIST .................................... 36
18.GENERAL INFORMATION ......................................................... 38
19. TROUBLE SHOOTING ............................................................... 47
1.SPECIFICATION
1. GENERAL SECTION
1 POWER SUPPLY 14.4 DC (10.6V ~ 16V)
2 TONE CONTROL ±10dB at 100 Hz (BASS)
±10dB at 10 KHz (TREBLE)
3 DIMENSIONS (W x H x D) 178 mm(W) × 50 mm(H) × 175 mm(D)
4 MAXIMUM POWER OUTPUT 40W x 4ch
5 CURRENT CONSUMPTION Less than 15A
6 WEIGHT 1.5kg
7 GROUND POLARITY NEGATIVE
8 SPEAKER IMPEDANCE 4
2. AM SECTION
NO DESCRIPTION UNIT NORMAL LIMIT
1 FREQUENCY RANGE KHz 522~1620
2 INTERMEDIATE FREQUENCY KHz 450
3 USABLE SENSITIVITY 603 KHz dBµ 30 35
(AT 20dB S/N) 999 KHz dBµ 30 35
1404 KHz dBµ 30 35
4 SELECTIVITY (D/T: ±9KHz, AT 999KHz) dB 60 40
5 IF REJECTION RATIO dB 60 50
6 IMAGE REJECTION RATIO dB 60 50
7 BANDWIDTH (AT-6dB) KHz 8 8±3
8 S/N RATIO dB 50 40
9 DISTORTION (AT 1W, INPUT 5mV) % 0.5 3
10 SEEK SENSITIVITY dBµ 35 ±10
3. FM SECTION
NO DESCRIPTION UNIT NORMAL LIMIT
1 FREQUENCY RANGE MHz 87.5~108.0
2 INTERMEDIATE FREQUENCY KHz 550
3 USABLE SENSITIVITY 90.1 MHz dBµ 10 15
(FOR 30dB S/N) 98.1 MHz dBµ 10 15
106.1 MHz dBµ 10 15
4 IF REJECTION RATIO dB 65 50
5 IMAGE REJECTION RATIO dB 50 45
6 S/N RATIO (WITH 1mV INPUT, AT98.1 MHz) dB 55 50
7 DISTORTION (AT 1W, INPUT 1mV) % 0.5 2
8 SEEK SENSITIVITY LOW 22
MID dBµ 22 ±10
HIGH 22
-3-
4. FM STEREO SECTION
NO DESCRIPTION UNIT NORMAL LIMIT
1 SEPARATION ( AT 1KHz, DEV. 46KHz,60dBu) dB 30 20
2 S.N.C (10dB SEPARATION, 1mV) dBµ 42 ±10
3 STEREO INDICATOR SENSITIVITY dBµ 5 10
(AT 98.1MHz)
5. RDS SECTION
NO DESCRIPTION UNIT NORMAL LIMIT
1 AF REQUEST LEVEL 98.1 MHz dBµ 30 ±10
2 TP SEEK STOP LEVEL 98.1 MHz dBµ 30 ±10
3 PS NAME SENSITIVITY 98.1 MHz dBµ 30 ±10
6. CDP SECTION
NO DESCRIPTION TRACK UNIT NORMAL LIMIT
1 S/N RATIO 2/7 dB 65 60
2 DISTORTION 2 % 0.5 1.5
3 SEPARATION 8/10 dB 50 40
4 CH BALANCE 2 dB 0 3
5 FREQUENCY RESPONSE 20Hz 3 dB -2 ±3
1KHz 2 dB 0 0
20KHz 6 dB -2 ±3
6 TONE EFFECT BASS(AT 100HZ) dB ±10 ±4
(VOLUME LEVEL8) TREBLE(AT 10KHz) dB ±10 ±4
7 MAXIMUM OUTPUT POWER 2 W 18 16
# TEST CD : ABEX TCD-784 TEST CD TYPE2
NOTE: 1. The above "normal" specifications represent the design specifications.
2. Product specifications may exhibit a small plus or minus tolerance compared to these
design specifications.
3. The performance of any unit is not expected to be less than the above "limit" specification.
-4-
2. DUMMY LOAD
1. AM DUMMY ANTENNA
30 OHM 15pF
SSG 65pF ANT INPUT
50 OHM dBu,-6dB Loss,75
2. FM DUMMY ANTENNA
10 OHM 45 OHM
SSG 60 OHM ANT INPUT
50 OHM dBu,-6dB Loss,75
SSG DIRECT ANT INPUT
75 OHM dBu EMF, 75
-5-
3. HELPFUL HINTS
RADIO
Broadcast Reception Performance Characteristics
FM reception poses particularly challenging problems because FM radio wavers are transmitted at
very high frequencies in straight lines like light waves. Any number of obstacles can and do get
in the way : tall buildings, hills, etc. Such obstacles can cause "shadows" with momentary loss of
signal.
In addition, FM signals can also be reflected by obstructions. When this happens, direct and
reflected signals from the same station can arrive at the car's antenna simultaneously. The noise
this causes is known as multipath interference.
The tuner in this unit was designed to minimize multipath interference and other common reception
problems.
Under weak signal conditions, the Signal Actuated Stereo Control(SASC) circuit takes over to provide
the strongest possible signal, switching to mono reception when-circumstances warrant.
An automatic distance/local reception circuit(Keyed Automatic Gain Control) provides full sensitivity,
while a dual-gate FET RF amplifier provides a high signal-to-noise-ratio.
Optimum selectivity virtually eliminates interference from strong nearby stations, and a special FM
noise canceller works to suppress ignition noise and other pulse interference. Wide dynamic range
avoids overload distortion and the unpleasant noise it causes.
Nor has AM reception been neglected in the design of this tuner. A special circuit feature permits
only the strongest, clearest stations to get through when broadcast conditions are less than optimum.
It is one more refinement that accounts for the superb performance of the tuner and adds to your
listening enjoyment.
AM and FM
Both AM and FM reception has advantages and disadvantages resulting from their differing properties.
AM waves can reach longer distances than FM waves. They can bend around buildings or mountains
and bounce off the ionosphere. This means that an AM service area is very wide.
FM waves, on the other hand, have much higher frequencies and shorter wave lengths.
Unlike AM waves, they cannot travel around corners. They reflect off solid objects in their path,
which limit the areas they can reach. An average FM signal can be heard only within a 25miles
to 35miles radius of a transmitter.
Arrival distance Sound quality
AM 60~120miles Fair
FM 25~30miles Good
ionosphere
ionosphere
mountain
The earth
-6-
Stereo and Monaural
Stereo and Monaural FM reception characteristics and also different. Monaural transmission utilizes
the range of audio frequencies audible to the human ear. Stereo transmission relies on a range of
frequencies that extend beyond human hearing limits on both the high and low ends.
This broadened frequency range requires more power, thereby reducing the range of a station broad-
casting in stereo.
Stereo Monaural
L
+ MO
R NO
L-R
15KHz 53KHz 15KHz
Frequency Frequency
In weak signal areas-called fringe areas there will be increased noise on stereo broadcasts.
When signal strength diminishes significantly in the stereo mode, the radio will automatically switch
to monaural transmission.
Switching Point
Stereo Mono
Signal Noise Level
Noise Level (MONO)
Level (MONO)
Signal
Level
(ST)
Distance
-7-
4-1. REAR VIEW AND CONNECTION_A458
How to connect (Rear side)
24 PIN CONNECTOR
Connector terminals
24 PIN CONNECTOR (SET TOP VIEW) PIN FUNCTION
1 FRONT LEFT +
2 FRONT RIGHT +
3 REAR RIGHT +
4 REAR LEFT +
5 ILLUMINATION +
6 STEERING REMOCON
7 NC
8 GND
9 NC
10 NC
11 ACCESSORY
12 BATTERY
13 FRONT LEFT -
14 FRONT RIGHT -
15 REAR RIGHT -
16 REAR LEFT -
17 ILLUMINATION -
18 STEERING REMOCON GND
19 TEL MUTE(Active High)
20 GND
21 NC
22 NC
23 AUTO ANTENNA
24 POWER GND
-8-
4-2. REAR VIEW AND CONNECTION_B458
How to connect (Rear side)
BLUETOOTH MIC CONNECTOR
24 PIN CONNECTOR
Connector terminals
24 PIN CONNECTOR (SET TOP VIEW) PIN FUNCTION
1 FRONT LEFT +
2 FRONT RIGHT +
3 REAR RIGHT +
4 REAR LEFT +
5 ILLUMINATION +
6 STEERING REMOCON
7 NC
8 GND
9 NC
10 NC
11 ACCESSORY
12 BATTERY
13 FRONT LEFT -
14 FRONT RIGHT -
15 REAR RIGHT -
16 REAR LEFT -
17 ILLUMINATION -
18 STEERING REMOCON GND
19 TEL MUTE(Active High)
20 GND
21 NC
22 NC
23 AUTO ANTENNA
24 POWER GND
-9-
5-1. BLOCK DIAGRAM_A458
24P Connector
- 10 -
5-2. BLOCK DIAGRAM_B458
- 11 -
6. KEY MATRIX
[A458]
Vdd[V] [K] AD KEY1
KEY ASSIGN
5 Rbias 4.7 [V]
- 0 SW701 MODE 0
R705 0.47 VR701 POWER 0.4545
R706 0.56 SW702 SEEK UP 0.8988
R707 0.68 SW703 MENU 1.3339
R708 0.91 SW704 SEEK DOWN 1.7896
R709 1.2 SW705 EMPTY 2.2418
R710 1.8 SW706 EMPTY 2.7229
R711 2.7 SW707 M1/DISP 3.1951
R712 4.7 SW708 M2/SCN 3.6738
[K] AD KEY2
KEY ASSIGN
Rbias 4.7 [V]
- 0 SW709 M3/RPT 0
R713 0.47 SW710 M4/RDM 0.4545
R714 0.56 SW711 M5/DIR- 0.8988
R715 0.68 SW712 M6/DIR+ 1.3339
R716 0.91 SW713 EMPTY 1.7896
R717 1.2 SW714 TA/AF 2.2418
R718 1.8 SW715 PTY 2.7229
R719 2.7 SW716 AM/FM 3.1951
[B458]
Vdd[V] [K] AD KEY1
KEY ASSIGN
5 Rbias 4.7 [V]
- 0 SW701 MODE 0
R705 0.47 VR701 POWER 0.4545
R706 0.56 SW702 SEEK UP 0.8988
R707 0.68 SW703 MENU 1.3339
R708 0.91 SW704 SEEK DOWN 1.7896
R709 1.2 SW705 SEND 2.2418
R710 1.8 SW706 END 2.7229
R711 2.7 SW707 M1/DISP 3.1951
R712 4.7 SW708 M2/SCN 3.6738
[K] AD KEY2
KEY ASSIGN
Rbias 4.7 [V]
- 0 SW709 M3/RPT 0
R713 0.47 SW710 M4/RDM 0.4545
R714 0.56 SW711 M5/DIR- 0.8988
R715 0.68 SW712 M6/DIR+ 1.3339
R716 0.91 SW713 EMPTY 1.7896
R717 1.2 SW714 TA/AF 2.2418
R718 1.8 SW715 PTY 2.7229
R719 2.7 SW716 AM/FM 3.1951
- 12 -
7. MAIN P.C.BOARD
TOP VIEW BOTTOM VIEW
- 13 -
8. MAIN SCHEMATIC DIAGRAM
8-1. A458
Main Circuit
R330 Q302 KTC2020D
1 3 L300
1.0 1/2W D301 1N4007G R332 Q304 KTC2020D 640uH BLUETOOTH OPTION
7
1 3 1 3 POWER_14V 3 1
R331
2
1 3 1.0 1/2W U303 KRX101U
Q322 KTC 2020D
Q308 3 4 A_G
CON504 OPEN(NAVI SMT USB)
R311
Q306 B772Y
47K
Q303
1.0 1/2W Q321 OPEN(2SD1862) R333 Q305 2SD1862 D882Y 1 3 1 2
2
2
2
KTC2020D 1 3 1 3 1 3 4 3 5
Q2C Q2E Q307 GND
D302 1N 5408
R310 1K
OPEN(47uF/16V) OPEN (330)
2
C3875S
R 309 1K
R 308 1K
2 SPI_MISO
R307 1K
U301 KRX101U 1.0 1/2W U302 KRX101U 4
C318 220P
0.1
3300uF/16V
5
6
Q1B SPI_MISO
Q301 2SD1862
2
R304
1 3 5 1 SPI_MOSI 3
2
R312
2
2
Q1C Q1E SPI_MOSI
4 3 4 3
C317
C316
100uF/10V
Q2C Q2E Q2C Q2E 1K 1/4W
47uF/16V
R 301 330
SPI_CLK 2
100uF/10V
1K
1K
SPI_CLK
R 303 1K
8.2VB R 302 1K
47uF/16V
2