LG NCS710BR User Manual
MODEL: NCS710BRSERVICE MANUAL
Internal Use Only
Website http://biz.lgservice.com
CAR CD/MP3/WMA
RECEIVER
SERVICE MANUAL
MODEL: NCS710BR
P/NO : AFN75512859 SEPTEMBER, 2011
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
CONTENTS
SECTION 1 SUMMARY
SERVICING PRECAUTIONS .............................................................................................................................1-2
ESD PRECAUTIONS ..........................................................................................................................................1-3
SPECIFICATIONS ..............................................................................................................................................1-4
LOCATION OF USERS CONTROLS ................................................................................................................. 1-5
HOW TO SETTING THE OPTION CODE ..........................................................................................................1-6
FIRMWARE UPGRADE METHOD ..................................................................................................................... 1-7
HOW TO CONNECT AUDIO SET TO POWER SUPPLY .................................................................................. 1-8
SECTION 2 ELECTRICAL
ELECTRICAL TROUBLESHOOTING GUIDE ....................................................................................................2-1
1. SYSTEM CONTROL ERROR CORRECTION FLOW CHART .................................................................2-1
2. SOUND ERROR CORRECTION FLOW CHART ......................................................................................2-4
3. DISPLAY ERROR CORRECTION FLOW CHART ....................................................................................2-7
4. TUNER ERROR CORRECTION FLOW CHART .....................................................................................2-10
5. CDP ERROR CORRECTION FLOW CHART .........................................................................................2-11
6. USB ERROR CORRECTION FLOW CHART ..........................................................................................2-14
7. BLUETOOTH ERROR CORRECTION FLOW CHART ...........................................................................2-16
8. AUX ERROR CORRECTION FLOW CHART ..........................................................................................2-17
WAVEFORMS ...................................................................................................................................................2-18
CIRCUIT VOLTAGE CHART ............................................................................................................................ 2-20
INTERNAL BLOCK DIAGRAM OF ICS ........................................................................................................... 2-21
1. IC601 (BD3702FV) ...................................................................................................................................2-21
2. IC801 (LV5693P) .....................................................................................................................................2-22
3. IC804 (TB2946HQ) ..................................................................................................................................2-24
WIRING DIAGRAM ...........................................................................................................................................2-25
BLOCK DIAGRAMS .........................................................................................................................................2-27
CIRCUIT DIAGRAMS .......................................................................................................................................2-31
1. MAIN CIRCUIT DIAGRAM .......................................................................................................................2-31
2. DSP_1 CIRCUIT DIAGRAM ....................................................................................................................2-33
3. DSP_2 CIRCUIT DIAGRAM ....................................................................................................................2-35
4. FRONT CIRCUIT DIAGRAM ...................................................................................................................2-37
5. CD CIRCUIT DIAGRAM ...........................................................................................................................2-39
PRINTED CIRCUIT BOARD DIAGRAMS ........................................................................................................2-41
1. MAIN P.C.BOARD ...................................................................................................................................2-41
2. FRONT P.C.BOARD ................................................................................................................................2-43
3. CD P.C.BOARD .......................................................................................................................................2-44
SECTION 3 EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION .................................................................................................. 3-1
2. MECHANISM(PICK-UP) SECTION ...........................................................................................................3-3
SECTION 4 REPLACEMENT PARTS LIST
1-1
SECTION 1 SUMMARY
SERVICING PRECAUTIONS
1. Always disconnect the power source before:
1) Removing or reinstalling any component, circuit board, module or any other instrument assembly.
2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection.
3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an
explosion hazard.
2. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service
manual might be equipped.
3. Do not apply power to this instrument and or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.
4. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting
the test instrument positive lead. Always remove the test instrument ground lead last.
1) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing,
follow the printed or indicated service precautions and service materials.
2) The Components used in the unit have a specifi ed confl ammability and dielectric strength. When replacing
any components, use components which have the same ratings. Components marked in the circuit diagram
are important for safety or for the characteristics of the unit. Always replace with the exact components.
3) An insulation tube or tape is sometimes used and some components are raised above the printed writing
board for safety. The internal wiring is sometimes clamped to prevent contact with heating components.
Install them as they were.
4) After servicing always check that the removed screws, components and wiring have been installed correctly
and that the portion around the service part has not been damaged. Further check the insulation between
the blades of attachment plug and accessible conductive parts.
1-2
ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called electrostatically sensitive devices (ESD). Examples of typical ESD devices are integrated circuits
and some fi eld-effect transistors and semiconductor chip components. The following techniques should be used
to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a know earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior
to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface
such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classifi ed as “anti-static” can
generate electrical charges suffi cient to damage ESD devices.
5. Do not use freon-propelled chemicals These can generate electrical charges suffi cient to damage ESD de-
vices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are ready to
install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive
foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL
OTHER SAFETY PRECAUTIONS.
8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted fl oor can generate
static electricity suffi cient to damage an ESD device).
CAUTION. GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE,
IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A
RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENED TO ALERT
THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.
1-3
SPECIFICATIONS
• General
Output Power 53 W x 4 CH (Max.)
Power Source DC 12 V
Speaker impedance 4 Ω
Ground System Negative
Dimensions (W x H x D) (178 x 50 x 169) mm (without Control Panel)
Net Weight 1.37 kg
• TUNER
FM Tuning Range 87.5 MHz to 108.0 MHz
S / N Ratio 55 dB
Distortion 0.7 %
Usable Sensitivity 12 dBμV
AM (MW) Tuning Range (520 to 1720) kHz or (522 to 1620) kHz
S / N Ratio 50 dB
Distortion 1.0 %
Usable Sensitivity 28 dBμV
• CD
Frequency Response 20 Hz to 20 kHz
S / N Ratio 80 dB
Distortion 0.12 %
Channel Separation (1 kHz) 55 dB
• AUX
Frequency Response 20 Hz to 20 kHz
S / N Ratio 80 dB
Distortion 0.1 %
Channel Separation (1 kHz) 45 dB
Max Input Level (1 kHz) 1.1 V
• USB
Version USB 1.1 or USB 2.0 Full Speed
Bus Power Supply (USB) DC 5 V 1 A
• SD
Distortion 0.1 %
• Line OUT
Frequency Response 20 Hz to 20 kHz
Output Voltage 2 V (Max.)
• Subwoofer
Frequency Response 20 Hz to 120 Hz
Output Voltage 2 V (Max.)
Design and specifi cations are subject to change without notice.
1-4
FRONT PANEL
A
I
LOCATION OF USERS CONTROLS
BC D EF G
[Front unit detached panel]
JK L MN OPQHRSTU
A
Ejects a disc.
B SRC/ • OFF
- When pressed, selects function sources.
- When pressed and held, powers unit on or off.
C
Plays and pauses playback.
Temporarily stops the sound.
D Volume knob
- Adjusts volume level.
- Confi rms the settings.
- Checks tracks, files or preset stations.
E
In each mode, sets playback items.
Activates setting menu.
F BAND
- Selects a band in Tuner mode.
- Moves to a next USB drive.
• TA
- Searches stations that have TA / TP
information, when it is pressed and held.
G Display window
H
Opens the front panel.
I
Recording to USB / SD card.
J
- Activates BT function.
- Answers a call.
K
Returns to the previous step.
Ends a call.
L
Skip/ Search/ Seek/ Tune
M EQ
Improves sound quality.
- When pressed, selects the EQ function.
N DISP
- Press it, you can check the clock time.
- Press and hold it, you can turn on/off the
display window and the light of LED buttons.
O INT
Intro scan.
P RPT
Repeats playback.
Q SHF
Shuffl es playback.
R Numeric buttons (1 to 6)
Selects a numbered preset station in TUNER.
S AUX
If connected to other portable player, you can
enjoy music from it on the unit.
T USB port
U SD card slot
1-5
HOW TO SETTING THE OPTION CODE
1. Option Table
Option Codes for Car CD products of 2011 will be defi ned as below
* OPTION TABLE
INDEX AREA RDS OPTION CODE SUFFIX
1 EU SUPPORT 111
2 EU SUPPORT 112 ERUSLL*
3 EU PS_RT_ONLY 121
4 S.America PS_RT_ONLY 221
EDEULL*
EDZALL*
EESPLL*
EHUNLL*
EMARLL*
ESWELL*
ETUREL*
EZAFLL*
EINDLL*
EIRNJL*
EISRRL*
ENGALL*
ESAUBL*
YEGYIL*
ECHLLL*
ECOLLL*
EPANLL*
PBRALL*
YMEXCL*
The option code is comprised of 3 digits and each digit has a range 1~6.
In the 2011, Car CD Product has totally four option codes from entire suffi xes.
2. Operation
1. Entering Option Setting Function
1) Power off on the radio source.
2) Push and hold the SRC(PWR) Key for 5 seconds, then It goes to the version display mode.
3) Push BAND Key until the LCD displays “OPTION(OPTN) XYZ”.
(The XYZ means the Option Code)
2. How to change the option code
1) The Input mode can be set by press the volume knob, the fi rst digit will be blinking until the
new code is set.
2) The number what you want to input could be selected by spinning the volume knob clockwise or
counterclockwise.
And then, if you push the volume knob, the selected number will be changed and the focus is moving
to the next.
You can also input the new option code of 1~6 by using preset keys if they are on the front panel.
3) If the new option code is acceptable, “SUCCESS XYZ” will be displayed on the LCD, and then it’ll reset
soon automatically.
4) If the new option code is not acceptable, “CODE ERR” will be displayed on the LCD.
To retry to change the option code, push the volume knob again.
1-6
FIRMWARE UPGRADE METHOD
[ MAIN AND CD/USB FIRMWARE UPGRADE ]
1. Confi rmation of version information
• Change the Source of audio set to tuner. (Default: tuner)
• Turn power off using power key.
• Press power key for 5 s. (After power on, continue pressing)
• After 5 s, beep sound rings two times.
Then version information would show up at display.
• In order to check version of MAIN and CD/USB system, Press band key.
2. Upgrade Program reading
• Insert update CD or USB in ACC on state and then is displayed in order.
CD : [Reading → File Check → Download?], USB : [USB Check → Download?]
3. Upgrade start
• In order to start upgrade, Press preset 1 Key until “CHECK CD” Display on the LCD.
4. Upgrade progress display
• Upgrade is in progress now.
[ CHECK CD → ERASE → WRITE → I-VRF → D-VRF ]
5. Upgrade Completion
• When Upgrade fi nished, the display shows up “DOWN OK”. After a while, the audio set is
reset automatically.
• Caution!
If power is off on the way of upgrading fi rmware, the set can’t be recovered.
Therefore pay lots of attention for power not to be off.
1-7
HOW TO CONNECT AUDIO SET TO POWER SUPPLY
• It is suffi cient only to supply power for upgrade.
• Shown from the right fi gure, connect yellow line (Battery) and red line (Ignition) to plus and minus terminal
respectively.
• Jack is connected to the audio set via its shapes matched each other.
• We need power supply for operation of audio set (Voltage : 12~15 V Current : Over 2 A)
Before connection between set and power supply, adjust voltage level to 15 V typically (It is okay up to 12 V.)
Power Supply has a variety of shapes and capacity of voltage and current.
At fi rst check these things.
1-8
SECTION 2 ELECTRICAL
ELECTRICAL TROUBLESHOOTING GUIDE
1. SYSTEM CONTROL ERROR CORRECTION FLOW CHART
Something wrong with the System control?
1A 1B 1C 1D
No power?
YES
Checked the Fuse?
YES
Checked the Back up
VDD and GND?
YES
Checked the Regulator
Back up VDD?
YES
NO
NO
NO
F301 Inside of JK801
JK801(1, 2, 3)
IC801(15, 14)
Checked the Main Micom
B+ Detect?
YES
Checked the Main
Micom VDD?
YES
Checked the Main
Micom GND?
YES
Checked the Main
Micom reset?
YES
Checked the Main
Micom X-tal?
YES
Checked the ACC in?
YES
Checked the Front
Panel Key input?
YES
NO
IC401(56)
NO
IC401(30, 47, 50, 99, 100)
NO
IC401(20, 51, 97, 98)
NO
IC401(90), IC402
NO
X401, X402
NO
Q802, R459, IC401(4)
NO
IC401(53, 54), CN402(7, 8)
OK
2-1
1A
Not available to Volume control?
YES
Checked the
Encoder volume?
YES
Checked the
Volume IC control?
YES
OK
1B
Not available to Key control?
YES
Checked the
Tact switch?
YES
Checked the
Key line?
NO
EV901, IC401(82, 83), CN402(14, 15)
NO
IC401(28, 29), IC601(25, 26)
NO
SW901~SW918
NO
IC401(53, 54), CN402(7, 8)
OK
YES
2-2
1C
Not available to Telephone Mute?
YES
Checked the
Tel Mute input?
YES
Checked the
Mute control?
YES
OK
1D
Not available to ANT(Motor Type) control?
YES
Checked the
ANT control?
NO
D811, Q805, Q806, IC401(11)
NO
IC401(21, 27), IC804(22)
NO
D808, IC801(6, 11), IC401(23)
OK
YES
2-3
2. SOUND ERROR CORRECTION FLOW CHART
Something wrong with the Sound?
2A 2B 2C
No sounds of All Functions?
YES
Checked the
E-VR VDD?
YES
Checked the
E-VR GND?
YES
Checked the
E-VR control?
YES
Checked the E-VR
Mute control?
YES
Checked the E-VR
Signal in/out?
YES
Checked the
Power IC VDD?
YES
NO
NO
NO
NO
NO
NO
IC601(24)
IC601(27)
IC601(25, 26), IC401(28, 29)
IC601(15), IC401(27)
IC601(1, 2, 3, 4, 5, 6, 7, 9,
18, 19, 20, 21, 22, 23)
IC804(6, 20)
Checked the
Power IC GND?
YES
Checked the
Power IC control?
YES
Checked the Power
IC Signal in/out?
YES
Checked the
Main connector?
YES
OK
NO
NO
NO
NO
IC804(1, 2, 8, 13, 18, 24)
IC804(4, 22), IC401(18, 21)
IC804(3, 5, 7, 9, 11, 12, 14,
15, 17, 19, 21, 23)
JK801(11, 12, 13, 14, 15, 16, 17, 18)
2-4
2A
Hearing the Pop Noise?
YES
Checked the
Mute contorl?
YES
OK
2B
No Sound External AMP?
YES
Checked the
Line Out signal?
YES
Checked the Line Out
AMP Mute control?
YES
NO
NO
NO
IC401(21, 25, 27), IC601(15), IC804(22),
Q601, Q602, Q603, Q604, Q607
IC601(18, 19, 20, 21, 22, 23)
Q601, Q602, Q603, Q604, Q607
Checked the Line Out
AMP signal in/out?
YES
OK
2C
No output Beep sound?
YES
Checked the
Beep control?
YES
OK
NO
JK601
NO
IC401(80), IC601(14)
2-5
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