LG LAC-M5600 Service Manual

CAR CD/MP3/WMA
RECEIVER

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

P/N : AFN31552406 AUGUST, 2006

MODEL:LAC-M5600/LAC-UA560

SERVICE MANUAL MODEL:LAC-M5600/LAC-UA560

- 1-1 -

[CONTENTS]

❍ SECTION 1.GENERAL

• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

• LOCATION OF CUSTOMER CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

• INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

• CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

❍ SECTION 2. ELECTRICAL

• ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

• WAVEFORMS OF MAJOR CHECK POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

• INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

• BLOCK DIAGRAM (WHOLE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

• BLOCK DIAGRAM (CDP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23

• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

❍ SECTION 3. EXPLODED VIEWS

• CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

- ACCESSORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

• MECHANISM (PICK-UP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

❍ SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

- 1-2 -

❏ SERVICING PRECAUTIONS

❶ 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.

❷ Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by

this service manual might be equipped.

❹ Do not apply power to this instrument and or any of its electrical assemblies unless all

solid-state device heat sinks are correctly installed.

❸ 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 specified conflammability 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.

SECTION 1. SUMMARY

- 1-3 -

❏ 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 field-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 known 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 classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.

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 floor can gen­erate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD 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 INTENDED TO ALERT
THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.

- 1-4 -

❏ SPECIFICATIONS

MP3/WMA Disc compatibility with this unit is limited as follows:

1. Sampling Frequency / 8 - 48kHz (MP3) 22.05 - 48kHz (WMA)

2. Bit rate / within 8 - 320kbps (include VBR) (MP3) 32 -320kbps (WMA)

3. CD-R/CD-RW physical format should be “ISO 9660”

4. If you record MP3/WMA files using software which cannot create a FILE SYSTEM, for example

“Direct-CD” etc., it will not be possible to playback MP3/WMA files. We recommend that you use
“Easy-CD Creator” which can create an ISO9660 file system.

Customers should also note that permission is required in order to download MP3/WMA files and
music from the Internet.
Our company has no right to grant such permission.
Permission should always be sought from the copyright owner.

GENERAL

Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50W x 4CH (Max.)

Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DC 12V

Speaker impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Ω

Ground System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Negative

Dimensions (W x H x D) . . . . . . . . . . . . . . . . . . . . . . . .180 x 51 x 171 mm (Without Front Panel)

Net Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4 kg

CD SELECTION

Frequency Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 Hz-20 kHz

S/N Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80 dB

Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.1%

Channel Separation (1kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 dB

RADIO SELECTION

FM

Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65-74, 87.5-107.9 or 87.5-108 MHz

S/N Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55 dB

Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.7%

Usable Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 dBµV

AM (MW)

Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .520-1720 or 522-1620 kHz

S/N Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 dB

Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.0%

Usable Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 dBµV

- 1-5 -

❏ LOCATION OF CUSTOMER CONTROLS

12 3 6 7

8

5

1314 12 10 9

4

15

1[EJECT]
2 POWER / VOLUME [PWR/VOL]
3 DISPLAY WINDOW
4 DISC SLOT
5 REMOTE SENSOR
6 • SKIP / SEEK

• SEARCH / TUNE -/+

7 RELEASE
8 USB Port [USB]
9 DISPLAY / CLOCK [DISP / CLK]
10 EQUALIZER [EQ]
11 • AUTO STORE [AS]

• PRESET SCAN [PS]

12 • PRESET STATION [1-6]

• MP3 TRACK +10/-10

• FOLDER UP/DOWN [F+/F-]

• SHUFFLE [SHF]

• REPEAT [RPT]

• INTRO SCAN [SCAN]

• PLAY/PAUSE

13 Extreme Dynamic Sound System [XDSS]
14 SOURCE [SRC]
15 • [MUTE]

• SELECT [SEL]

• [BAND]

WMAMP3

WMAMP3

11

1[EJECT]
2 •

POWER [PWR]

• VOLUME/MUTE [VOL / MUTE]

3 DISPLAY WINDOW
4 DISC SLOT
5 REMOTE SENSOR
6 • CD SKIP/SEARCH /

• SEEK / TUNE -/+

• PROGRAM TYPE [PTY]

• TRAFFIC ANNOUNCEMENT [TA]

7 RELEASE
8 USB Port [USB]
9 DISPLAY / CLOCK [DISP / CLK]
10 EQUALIZER [EQ]
11 • AUTO STORE [AS]

• PRESET SCAN [PS]

12 • PRESET STATION [1-6]

• MP3 TRACK +10/-10

• FOLDER UP/DOWN [F+/F-]

• SHUFFLE [SHF]

• REPEAT [RPT]

• INTRO SCAN [SCAN]

• PLAY/PAUSE

13 Extreme Dynamic Sound System [XDSS]
14 SOURCE [SRC]
15 • ALTERNATIVE FREQUENCIES [AF]

• REGIONAL [REG]

• SELECT [SEL]

• [BAND]

WMAMP3

WMAMP3

AF/REG

EJECT

SRC

BAND

SEL

PWR

XDSS

VOL/MUTE

1

SC

AN

2

RPT

3

SHF

4

F-5F

+

6

AS/PS EQ

TA

PTY

DISP/CLK

USB

12 3 6 7

8

5

1314 12 10 9

4

15

11

1. Front Panel (LAC-M5600)

2. Front Panel (LAC-M5600R)

EJECT

MUTE

BAND

SEL

SRC

PWR

VOL

XDSS

2

1

SCAN

4

3

SHF

RPT

F-

5F+6

AS/PS EQ

DISP/CLK

USB

- 1-6 -

1 Remove the battery holder with a pencil or ball point pen.
2 Install the battery on the battery holder.
3 Install the battery holder back into its original position.

Notes

• Use only one CR2025 (3V) lithium battery.

• Remove the battery if the remote control is not used for a

long period of time.

• Do not leave the product in a hot or humid place.

• Do not handle the battery using metallic tools.

• Do not store the battery together with metallic materials.

• In the event of battery leakage, wipe the remote control

completely clean and install a new battery.

Battery installation

Remote Control

10

12

14

15

16

1

3

8

9

4
5

2

6
7

11

13

1 POWER [PWR] / MUTE
2 SELECTION [SEL]
3 SOURCE [SRC]
4 PLAY / PAUSE
5 INTRO SCAN [SCAN]
6 SHUFFLE [SHF]
7 • MP3 TRACK +10

• FOLDER UP [F+]

8 • CD SKIP / SEARCH

• SEEK / TUNE

9[BAND]
10 VOLUME UP

<

<

/ DOWN

11 NUMBER [#]
12 REPEAT [RPT]
13 NUMBER [0 -9]
14 • CD SKIP / SEARCH

• SEEK / TUNE

15 DISPLAY [DISP.]
16 • MP3 TRACK -10

• FOLDER DOWN [F-]

WMAMP3

WMAMP3

WMAMP3

WMAMP3

3. Remote control

- 1-7 -

❏ INSTALLATION

5

4

3

1

2

6

Front panel

Before installing, make sure that the ignition switch is set to
OFF and remove the terminal of the car battery to avoid
short-circuiting.

1 Remove the existing receiver unit.
2 Make the necessary connections.
3 Install the installation sleeve.
4 Install the unit into the installation sleeve.

Removing the existing receiver unit.

Please remove any installation sleeves already in place for the
receiver unit in the dashboard, it must be removed.

1 Remove the rear support from the unit.
2 Remove the front panel and trim ring from the unit.
3 Insert the lever into the hole on one side of the unit.

Perform the same operation on the other side and pull the
unit out from the mounting sleeve.

Basic Installation

1 Slide the unit into the ISO-DIN frame.
2 Install the screws removed from the old unit.
3 Slide the unit and frame into the dash opening.
4 Install the dash panel or adapter plate.
5 Install the trim ring into unit.
6 Install the faceplate by fitting the right edge into position

then pushing the left edge closed.

ISO-DIN Installation

Bend the claws
according to
the thickness
of the
dashboard

Front panel

A

A

•

•

A

- 1-8 -

❏ CONNECTION DIAGRAM

Before connecting, make sure that the ignition switch is set to OFF, and remove the battery
terminal to avoid short circuits.

1
2
3
4

5
6
7
8

BATTERY

POWER
ANT

DIMMER SWITCH

IGNITION SWITCH

CONTROL RELAY

REMOTE ON (BLUE/WHITE)

AMPLLIFIER
(Optional)

PHONE MUTE (ORANGE)

DIMMER (PINK)

TO IGNITION (RED)

GROUND(-) (BLACK)

POWER ANTENNA (BLUE)

TO BATTERY(+) (YELLOW)

1. WHITE FL+

2. WHITE/BLACK STRIPE FL-

3. GRAY FR+

4. GRAY/ BLACK STRIPE FR-

5. GREEN RL+

6. GREEN/ BLACK STRIPE RL-

7. VIOLET RR+

8. VIOLET/ BLACK STRIPE RR-

From antenna
To the wiring of the vehicle colors of leads.

A
B

A B

C

- 1-9 -

• BLACK : This lead is for the ground connection.

• ORANGE : This lead is for the phone line connection.

• PINK : This lead is for the dimmer line

connection.

• RED : This lead is for connection to the power

supply terminal when the ignition switch is
set to ACC.

• YELLOW : This lead is for connection to the battery

(back-up) terminal from which power is
always supplied.

• BLUE : This lead is for the power antenna

connection.

• BLUE/WHITE : This lead is for the remote amplifier on

connection.

L

R

L

R

1

2345678

REAR

FRONT

Connect the AUDIO OUTPUT connector of this unit to the

AUDIO INPUT connector of the Auxiliary Equipment.

Connecting to Auxiliary Equipment (Optional)

To AUDIO IN

To AUDIO IN

To AUDIO OUT

FL (Front Left)

FR (Front Right)

RL (Rear Left)

RR (Rear Right)

Speaker Connections

C

- 1-10 -

- 2-1 -

❏ ELECTRICAL TROUBLESHOOTING GUIDE

1. No Power.

Any Key power on.

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

Is power turnd on?

DISC loading?

Does initial reading occur?

Can disc be played?

Is audio output supplied?

OK

Check audio circuitry.
IC506, PN502

Check tracking servo circuitry.
Q501, IC506, IC504

Check DISC.

Check focusing circuitry.
Q501, IC506

Check laser circuitry.
Q501, IC506

Check loading supply circuitry.
IC802 Pin .

Check power supply circuitry.
IC802 Pin .

SECTION 2. ELECTRICAL

6

14

- 2-2 -

2. LCD light abnornal.

YES

YES

YES

YES

YES

YES

NO NO

NO

NO

NO

NO

NO

Any Key power on.

(without DISC)

Do display LCD then light?

Check voltage in the power
supply circuitry.

Power supply circuitry defective.

• Check Q403, Q404, Q406,
Q407, IC802 Pin .

• Reset circuit defective.
IC901 Surrounding circuit
defective.

• IC901 Pin defective.

Check X401, X402, C402,
C403, C404, C505.

PN401 or PN903 or front
PCB pattern defective.

IC401, Pins , , or
front PCB pattern defective.

IC901 Surrounding circuit
PCB pattern defective.

Display LCD connector
defective.

Is IC901 Com1, Com2, Com3
output waveform normal?

Is u-com IC401 Pins , ,

output waveform normal?

Is u-com IC401 pin reset
circuit normal?

Is u-com IC401 keyin
Pins , 5volt input?

Is u-com IC401 X1, X2 termi­nal Pins , , , input?
OSC : 19.2MHz
OSC : 32.768kHz

4

74

57

11

63

74 75 76

74 75

76

64

12 14 15