Lg Cm1530 User manual

MICRO HI-FI SYSTEM

SERVICE MANUAL

MODEL:

CM1530

(CM1530, CMS1530F)

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”

IN THIS MANUAL.

MODEL: CM1530 (CM1530, CMS1530F)SERVICE MANUAL

3102,MARCH76015232NFA:ON/P

Website http://biz.lgservice.com

Internal Use Only

CONTENTS

SECTION 1 ........ GENERAL

SECTION 2 ........ CABINET & MAIN CHASSIS

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ REPLACEMENT PARTS LIST

1-1

SECTION 1

SUMMARY

CONTENTS

SERVICING PRECAUTIONS................................................................................................................... 1-3

ESD PRECAUTIONS.................................................................................................................................. 1-5

SERVICE INFORMATION FOR EEPROM .......................................................................................... 1-6

PROGRAM UPDATE GUIDE................................................................................................................... 1-7

1. HOW TO UPDATE MICOM PROGRAM................................................................................................... 1-7

2. HOW TO UPDATE CD(ALI) PROGRAM.................................................................................................. 1-8

SPECIFICATIONS ....................................................................................................................................... 1-9

1-2

NOTES REGARDING HANDLING OF THE PICK-UP

1. Notes for transport and storage

1) The pick-up should always be left in its conductive bag until immediately prior to use.

2) The pick-up should never be subjected to external pressure or impact.

2. Repair notes

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and

impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or

damage to the printed-circuit board.

3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason

the adjustment point and installation screws should absolutely never be touched.

4) Laser beams may damage the eyes!

Absolutely never permit laser beams to enter the eyes!

Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

5) Cleaning the lens surface

If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used

for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton

swab should be used, taking care not to distort lens.

6) Never attempt to disassemble the pick-up.

Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.

(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much

of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

Storage in conductive bag Drop impact

NEVER look directly at the laser beam, and don’t allow

contact with fingers or other exposed skin.

Magnet

How to hold the pick-up

Conductive Sheet

Cotton swab

Pressure

1-3

SERVICING PRECAUTIONS

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components

are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components

can be damaged, and for that reason components should be handled with care.

2) The pick-up is composed of many optical components and other high-precision components. Care must be

taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magnet-

ism is present, or where there is excessive dust.

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded.

When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is

because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1 MΩ)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent stat-

ic electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Resistor

(1 MΩ)Conductive

Sheet

Resistor

(1 MΩ)

Armband

1-4

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.

1-5

ESD PRECAUTIONS

POWER ON

CD or USB or PORTABLE or

TUNE MODE

Press Remote control 'PLAY' key

+ Set Front 'STOP' key for 3S

Set Display Show page

CD 121009-V03

Set Display Show page

MCU 121010-V32-01001

Press Set Front ‘STOP’ key

+ Remote control ‘FWD SKIP’ key

FLD Display ‘E2P CLR’

Completed

NO. SOFTWARE FILE NAME

1 FM_ONLY_IPOD ******_**_00000

2 FM_ONLY_NO IPOD ******_**_00001

3 FM_RDS_IPOD ******_**_01000

4 FM_RDS_NO IPOD ******_**_01001

5 AM_FM_IPOD ******_**_10100

6 AM_FM_NO IPOD ******_**_10101

7 DAB_FM_RDS_IPOD ******_**_D01000

8 DAB_FM_RDS_NO IPOD ******_**_D01001

......

...... ......

1-6

SERVICE INFORMATION FOR EEPROM

1. HOW TO UPDATE MICOM PROGRAM

(1) Change the file name to download as “(Model Name)_(Year)_(Month)_(Date).BIN”.

Ex) MCU_1211010_V32

(2) Copy the file to the root folder of USB storage.

(3) Put the USB into the set. Change set function to USB function.

Then the upgrade process will be started with the upgrade intormation. Set display show "MCU-UP".

(4) If the upgrade process is complete, the set will be rebooted with “COMPLETED” message

and set auto power off.

(5) Pull out the USB storage.

Completed

set auto power off

1-7

PROGRAM UPDATE GUIDE

2. HOW TO UPDATE CD(ALI) PROGRAM

(1) Change the file name to download as “(Model Name)_(Version)_(Year)_(Month)_(Date).BIN”.

Ex) CD 121009-V03

(2) Copy the file to the root folder of USB storage.

(3) Put the USB into the set. Change set function to USB function.

Then the upgrade process will be started with the upgrade intormation. Set display show "UPDATING".

(4) If the upgrade process is complete, the set will be rebooted with “COMPLETED” message

“SPK” BUZZER no stop.

(5) Pull out the USB storage.

3 only ALARM

SHOW UPGRADE.....

15S after ALARM NO STOP

SHOW COMPLETED KEY

Press POWER OFF

Pull out the USB

COMPLETED KEY

1-8

• GENERAL

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External dimensions (W x H x D) 150 x 200 x 212 mm

Operating conditions Temperature 5 °C to 35 °C (41 °F to 95 °F)

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• INPUTS

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• TUNER

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• AMPLIFIER

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• CD

Frequency Response 40 Hz to 20 kHz

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• SPEAKERS

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Net Dimensions (W x H x D) 132 x 200 x 141 mm

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Note : Design and specifications are subject to change prior notice.

SPECIFICATIONS

1-9

1-10

MEMO

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

EXPLODED VIEWS..................................................................................................................................... 2-3

1. CABINET AND MAIN FRAME SECTION (CM1530) ................................................................................ 2-3

2. PACKING ACCESSORY SECTION ......................................................................................................... 2-7

3. SPEAKER SECTION (CMS1530F)........................................................................................................... 2-8

2-1

2-2

MEMO

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION (CM1530)

SMPS

MAIN

FRONT

USB

267

255

253

290

265

A26

A46

A47

A43

265

460

460 256

260

261

262 264

263

300

259

257

258

265

460

258

453

452

A42

252

251

451

254

452

A48

CABLE5

CABLE11

CABLE4

NOTES) THE EXCLAMATION POINT WITHIN AN

EQUILATERAL TRIANGLE IS INTENDED

TO ALERT THE SERVICE PERSONNEL

TO THE PRESENCE OF IMPORTANT

SAFETY INFORMATION IN SERVICE

LITERATURE.

MEMOMEMO

900 Remote Control

824 AM Antenna

808 Battery

802 Box

803T Packing

803B Packing

804 Bag

801 Instruction Ass'y

2. PACKING ACCESSORY SECTION

A60L

A60R

3. SPEAKER SECTION (CMS1530F)

SECTION 3

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE.................................................................................... 3-2

1. SMPS PART ........................................................................................................................................... 3-2

2. AUDIO ABNORMAL ............................................................................................................................... 3-4

3. AUDIO ABNORMAL IN FUNCTION MODE........................................................................................... 3-5

4. CD PART ................................................................................................................................................ 3-6

5. CD READING CHECK............................................................................................................................ 3-7

6. USB PART.............................................................................................................................................. 3-8

7. VFD DISPLAY CHECK........................................................................................................................... 3-9

WAVEFORMS OF MAJOR CHECK POINT ..................................................................................... 3-10

1. WHEN POWER ON, RESET & DATA ETC WAVEFORM................................................................... 3-10

2. WHEN USB FUNCTION OPERATING ................................................................................................ 3-12

3. STARTING ACTION WAVEFORM IN MD DEVICE (SLED HOME) .................................................... 3-13

4. RADIO OPERATING TU_DA/ CLK/ RST WAVEFORM....................................................................... 3-14

5. AT FIRST ACTION, FOCUS SIGNAL A/ B/ C/ D................................................................................. 3-15

6. RF WAVEFORM (ANALOG SCOPE)................................................................................................... 3-16

WIRING DIAGRAM ................................................................................................................................... 3-17

BLOCK DIAGRAM.................................................................................................................................... 3-19

CIRCUIT DIAGRAMS...............................................................................................................................3-21

1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-21

2. MAIN-1 CIRCUIT DIAGRAM ................................................................................................................ 3-23

3. MAIN-2 CIRCUIT DIAGRAM ................................................................................................................ 3-25

4. MAIN-3 CIRCUIT DIAGRAM ................................................................................................................ 3-27

5. MAIN-4 CIRCUIT DIAGRAM ................................................................................................................ 3-29

6. DISPLAY & USB CIRCUIT DIAGRAM ................................................................................................. 3-31

7. IPOD CIRCUIT DIAGRAM.................................................................................................................... 3-33

CIRCUIT VOLTAGE CHART................................................................................................................. 3-35

1. ICs......................................................................................................................................................... 3-35

2. DIODES ................................................................................................................................................ 3-35

3. CAPACITORS....................................................................................................................................... 3-36

4. CONNECTORS .................................................................................................................................... 3-37

PRINTED CIRCUIT BOARD DIAGRAMS ......................................................................................... 3-39

1. SMPS P.C.BOARD............................................................................................................................... 3-39

2. MAIN P.C.BOARD ................................................................................................................................ 3-41

3. DISPLAY P.C.BOARD.......................................................................................................................... 3-45

4. USB P.C.BOARD.................................................................................................................................. 3-45

5. IPOD P.C.BOARD ................................................................................................................................ 3-46

3-1