LG CM4730, CMS4630F, CMS4530W Schematic
MODEL: CM4730 (CM4730, CMS4630F, CMS4530W)SERVICE MANUAL
Internal Use Only
Website http://biz.lgservice.com
Mini Hi-Fi System
SERVICE MANUAL
MODEL:
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
3102,MAY03580867NFA:ON/P
CM4730
(CM4730, CMS4630F, CMS4530W)
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
HIDDEN KEY MODE................................................................................................................................... 1-6
SERVICE INFORMATION FOR EEPROM .......................................................................................... 1-7
PROGRAM DOWNLOAD & UPDATE GUIDE ................................................................................... 1-8
1. AUDIO PROGRAM ................................................................................................................................... 1-8
2. CD PROGRAM ......................................................................................................................................... 1-9
3. EQ PROGRAM ....................................................................................................................................... 1-10
SPECIFICATIONS ..................................................................................................................................... 1-11
1-2
SERVICING PRECAUTIONS
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.
Storage in conductive bag
Drop 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.
NEVER look directly at the laser beam, and don’t allow
contact with fingers or other exposed skin.
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.
Pressure
Magnet
How to hold the pick-up
Cotton swab
Conductive Sheet
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.
1-3
Pressure
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 magnetism 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 static 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.
Armband
Resistor
(1 MΩ)
Resistor
(1 MΩ)
Conductive
Sheet
1-4
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.
1-5
HIDDEN KEY MODE
Push both Front key and RCU key to activate it for 5 seconds.
1. Disc Lock On/Off (CD Function Only Active)
Front Key : STOP
RCU Key : STOP
2. Check Version and Option code
Front Key : STOP
RCU Key : PLAY/PAUSE
You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-.
3. Clear EEPROM
Front Key : STOP
RCU Key : SKIP-
4. Edit EEPROM
Front Key : STOP
RCU Key : SKIP+
You can change the digit of option by SKIP+/-.
You can edit 0~f by REPEAT or PLAY/PAUSE key.
5. Bluetooth DUT
Front Key : STOP
RCU Key : PROGRAM
Bluetooth model only
6. Power Disc Lock On/Off (CD Function Only Active)
Front Key : STOP
RCU Key : EQ
7. Amp Clip On/Off
Front Key : STOP
RCU Key : Mute
Amp Clip Mode Change (Amp Clip On --> Amp Clip Off --> Level Down display).
8. Demo ALL Key Lock (CM9520/CM8520 Only)
Front Key : STOP
RCU Key : 9
Demo All Key Lock Change (All Key Lock On --> All Key Lock Off).
- Working on Demo Operation only.
- When All Key Lock, Volume Key work only.
- After All Key Lock Off, it can unlock Demo Mode.
1-6
SERVICE INFORMATION FOR EEPROM
POWER ON
FLD no disc status or AUX status.
Remote control ‘Fwd skip’ + Front ‘STOP’
push same timing during 5 seconds.
FLD ‘OP-0….
Move to appropriate position and
make changes with remote control
‘skip, mode, play’ key.
Press ENTER key
FLD ‘write ok’
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
NAME
OPT0
OPT1
OPT2
OPT3
OPT4
OPT5
OPT6
OPT7
OPT8
OPT9
HEX
05
00
00
02
00
69
81
05
30
00
Remote control ‘Fwd skip’ +
Front ‘STOP’ push same timing
FLD ‘E2P CLR’
Completed
1-7
PROGRAM DOWNLOAD & UPDATE GUIDE
1. AUDIO PROGRAM
Download program file name must be CM4530_xxxxxxx.HEX
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage
device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other
function, nor power off the device. USB device must be unplugged when the downloading
process is completed.
ON VFD DISPLAY SCREEN
NO USB
↓← Insert USB device at USB function.
SEARCH
↓
FIRMWARE
↓
WRITE 00 .. 100
↓
UPDATED
↓
POWER OFF AUTOMATICALLY ← When completed, remove USB device.
1-8
2. CD PROGRAM
Download program file name must be HF000_CM4530_xxxxxxxx_xx.bin
Tip) With B/T : HF000_CM4530_xxxxxxxx_xx.bin
Without B/T : HF400_CM4530_xxxxxxxx_xx.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage
device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other
function, nor power off the device. USB device must be unplugged when the downloading
process is completed.
ON VFD DISPLAY SCREEN
NO USB
↓← Insert USB device at USB function.
SEARCH
↓
FIRMWARE
↓
FINISH
↓
POWER OFF MANUALLY ← When completed, remove USB device.
1-9
3. EQ PROGRAM
Download program file name must be EQ_PRG_CM4730_xxxxxxxxx_xxxx.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage
device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other
function, nor power off the device. USB device must be unplugged when the downloading
process is completed.
ON VFD DISPLAY SCREEN
NO USB
↓← Insert USB device at USB function.
READ
↓
EQ DOWN
↓
FINISH
↓
POWER OFF AUTOMATICALLY ← When completed, remove USB device.
1-10
SPECIFICATIONS
• GENERAL
Power requirements Refer to the main label.
Power consumption Refer to the main label.
Dimensions (W x H x D) 202 x 307 x 315 mm
Net Weight (Approx.) 3.15 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 5 % to 90 %
Bus Power Supply DC 5 V 500 mA
• INPUTS
AUX IN 2.0 Vrms (1 kHz, 0 dB), 75 Ω, RCA jack (L, R) x 1
• TUNER
FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
AM Tuning Range 522 to 1 620 kHz, 520 to 1 710 kHz or 522 to 1 710 kHz
• AMPLIFIER
Stereo mode 240 W + 240 W (3 Ω at 1 kHz, THD 10 %)
Surround mode
Front 240 W + 240 W (3 Ω at 1 kHz, THD 10 %)
Subwoofer 240 W (3 Ω at 60 Hz, THD 10 %)
• CD
Frequency Response 100 to 20 000 Hz
Signal-to-noise ratio 75 dB
Dynamic range 80 dB
• FRONT SPEAKER
Model CMS4630F
Type 2 Way 2 Speaker
Impedance 3 Ω
Rated Input Power 240 W
Max. Input power 480 W
Net Dimensions (W x H x D) 245 x 452 x 275 mm
Net Weight 5.55 kg
• SUBWOOFER SPEAKER
Model CMS4530W
Type 1 Way 1 Speaker
Impedance 3 Ω
Rated Input Power 240 W
Max. Input power 480 W
Net Dimensions (W x H x D) 250 x 352 x 327 mm
Net Weight 5.58 kg
Design and specifications are subject to change without notice.
1-11
MEMO
1-12
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS ..................................................................................................................................... 2-3
1. CABINET AND MAIN FRAME SECTION (CM4730) ................................................................................ 2-3
2. MECHANISM DECK SECTION (DP-12AM) ............................................................................................. 2-5
3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7
4. SPEAKER SECTION ................................................................................................................................ 2-8
2-1
MEMO
2-2
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION (CM4730)
260L
464
261
464
451
464
NOTES) THE EXCLAMATION POINT WITHIN AN
EQUILATERAL TRIANGLE IS INTENDED
TO ALERT THE SERVICE PERSONNEL
TO THE PRESENCE OF IMPORTANT
SAFETY INFORMATION IN SERVICE
G
LITERATURE.
460
464
A42
A43
FRONT
464
B
CABLE2
258
F
SMPS
262
A47
276
279
464
E
A
265
464
260R
464
E
464
D
251
464
464
259
F
464
MAIN
A
B
A46
C
464
C
464
A44
H
300
273
274
2. MECHANISM DECK SECTION (DP-12AM)
MEMO
001
A02
017
013
435
015
439
018
015B
015A
014
002
003
A01
020
016
026
A03
019
440
012
442
012
010
012A
037
442
3. PACKING ACCESSORY SECTION
801 Instruction Ass'y
808 Battery
825 FM Wire Antenna
803 Packing
804 Bag
824 AM Loop Antenna
900 Remote Control
803 Packing
802 Box
4. SPEAKER SECTION
4-1. FRONT SPEAKER (CMS4630F)
A60
4-2. SUBWOOFER SPEAKER (CMS4530W)
A90
MEMO
2-10
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