LG CM2630B User manual

Micro Hi-Fi System
SERVICE MANUAL
MODEL: CM2630B
(CM2630B, CMS2630FH)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: CM2630B (CM2630B, CMS2630FH)SERVICE MANUAL
P/NO : AFN76015290 MAY, 2013
Website http://biz.lgservice.com
Internal Use Only

CONTENTS
SECTION 1 ........ SUMMARY
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
MICOM HIDDEN KEY MODE................................................................................................................... 1-6
SERVICE INFORMATION FOR EEPROM........................................................................................... 1-7
PROGRAM DOWNLOAD GUIDE........................................................................................................... 1-8
1. AUDIO PROGRAM ................................................................................................................................... 1-8
2. CD PROGRAM ......................................................................................................................................... 1-9
3. TOUCH PROGRAM................................................................................................................................ 1-10
4. EQ PROGRAM ....................................................................................................................................... 1-11
SPECIFICATIONS ..................................................................................................................................... 1-12
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
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

1-6
HIDDEN MODE AVAILABLE
STATUS
ENTRANCE
KEY(Audio) EXIT KEY DISPLAY RESULT
Version Check POWER ON
STATUS
Front Stop +
RMC Play for 5s Play Key 1S
M 1211281
P 1212040
OP0 05
T 1209260
Q 1211140
QCS 31C5
1) Micom,
2) MCS,
3) EEPROM option
4) Touch
5) EQ
6) EQ CheckSum
EEPROM INITIAL POWER ON
STATUS
Front Stop +
RMC ‘<<’ for 5s auto exit “E2P CLEAR” EEPROM initialization
EEPROM EDIT POWER ON
STATUS
Front Stop +
RMC ‘>>’ for 5s Toggling OP0-10 Edit Micom option
Disc Lock POWER ON
STATUS
Front Stop +
RMC ‘Stop’ for 5s Toggling LOCKED UNLOCKED Disc Lock On/Off
Tuner Test POWER ON
STATUS
Front Stop +
RMC ‘Info’ for 5s Toggling RXX SYYx XX=RSSI, YY=SNR
APD Test Display POWER ON
STATUS
Front Stop +
RMC ‘3’ for 5s Toggling APXX:YY:ZZ
XX=Time,
YY=Minutes,
ZZ=Second
MICOM HIDDEN KEY MODE

POWER ON
FLD no disc status
Front ‘STOP’ + Remote control ‘ ’
push same timing during 5s
FLD ‘OP-0….
Move to appropriate position
and make changes with
RMC " , ,X/,REPEAT" key.
Press STOP key
FLD ‘WRITE OK’
Front ‘STOP’ + Remote control ‘ ’
push same timing
FLD ‘E2P CLR’
Completed
NAME
OPT 0
OPT 1
OPT 2
OPT 3
OPT 4
OPT 5
OPT 6
OPT 7
OPT 8
OPT 9
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
HEX
09
00
00
00
00
81
81
50
00
00
1-7
SERVICE INFORMATION FOR EEPROM

1. AUDIO PROGRAM
Download program file name must be CM2630_YYMMDDX.HEX
If security program (Water Wall) is activated on 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
PROGRAM DOWNLOAD GUIDE

2. CD PROGRAM
Download program file name must be HF000_CM2630_YYMMDDX.bin
If security program (Water Wall) is activated on 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. TOUCH PROGRAM
Download program file name must be TC380_LG_CM2630_YYMMDDX.DLD
If security program (Water Wall) is activated on 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
↓
T-WRT 00 .. 100
↓
UPDATED
↓
POWER OFF AUTOMATICALLY ← When completed, remove USB device.
1-10

4. EQ PROGRAM
Download program file name must be EQ_PRG.BIN
If security program (Water Wall) is activated on 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
↓
EQ DOWN
↓
POWER OFF AUTOMATICALLY ← When completed, remove USB device.
1-11

SPECIFICATIONS
•GENERAL
Power supply Refer to the main label.
Power consumption Refer to the main label.
Dimensions (W x H x D) 285 x 130 x 292 mm
Net Weight (Approx.) 3.7 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
PORT. IN 0.5 Vrms (3.5 mm stereo jack)
•TUNER
FM Tuning Range 87.5 MHz to 108.0 MHz or 87.50 MHz to 108.00 MHz
•AMPLIFIER
Stereo mode 80 W + 80 W
T.H.D 10 %
•CD
Frequency Response 30 to 20000 Hz
Signal-to-noise ratio 80 dB
Dynamic range 80 dB
•SPEAKERS
Type 3 Way 4 Speaker
Impedance 4 Ω
Rated Input Power 80 W
Max. Input Power 160 W
Net Dimensions (WxHxD) 132 x 286 x 304 mm
Net Weight (1EA) 4 kg
Design and specifi cations are subject to change without notice.
1-12

SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
DISASSEMBLY INSTRUCTIONS........................................................................................................... 2-2
1. SIDE CASE PART .................................................................................................................................... 2-2
EXPLODED VIEWS..................................................................................................................................... 2-3
1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-3
2. DECK MECHANISM SECTION (SDM-01BA)........................................................................................... 2-5
3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7
4. SPEAKER SECTION ................................................................................................................................ 2-8
2-1

2-2
1) Remove the Screws. (4EA)
2) Pull the Side Case from the rear of the Main Chassis.
3) Remove the Side Case to move from side to side.
DISASSEMBLY INSTRUCTIONS
Figure 1
Figure 3
Figure 2
1. SIDE CASE PART

J
G
F
H
J
E
G
F
CD
E
A
H
MAIN
SMPS
VFD
A
C
D
TOP JACK
TOUCH
CABLE1
CABLE4
CABLE2
462
465
462
462
462
465
264
264
465
462
255
254
A44
263
462
260
252
462
252
250
462
251
A41
465
261
465
462
A42
256
256
257
462
462
258
253
A43
300
462
262
A46
A47
B
CABLE3
270
B
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION 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.

2. DECK MECHANISM SECTION (SDM-01BA)
1049
1437
1024
1024
1438
A002
1006
1437
1437
1024
1437
A006
1439
1021
1024
1030
1013
1014
1012
1009
1016
1017
1007
1011
1020
1002
1004
1005
1001
1003
1435
A001
A004
1436
1015
A005
1008
A003
MEMO

2-7
801 Owner’s manual
825 FM Antenna
803 Packing
802 Box
803T Packing
804A Bag
803B Packing
Remote Control900
Battery808
Bag
804
3. PACKING ACCESSORY SECTION

2-8
A60L
A60R
4. SPEAKER SECTION

3-1
SECTION 3 ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2
1. NO POWER PROBLEM ......................................................................................................................... 3-2
2. SPEAKER NO AUDIO OUTPUT ............................................................................................................ 3-3
3. USB NO OUTPUT .................................................................................................................................. 3-4
4. NO BOOTING ......................................................................................................................................... 3-5
ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................... 3-6
1. POWER (SMPS) ..................................................................................................................................... 3-6
2. μ-COM PART CHECK-1 ......................................................................................................................... 3-7
3. μ-COM PART CHECK-2 ......................................................................................................................... 3-7
4. FLD DISPLAY CHECK ........................................................................................................................... 3-8
5. TOUCH PART CHECK ........................................................................................................................... 3-9
6. AMP PART CHECK .............................................................................................................................. 3-10
7. TUNER FUNCTION CHECK................................................................................................................. 3-11
8. DAB FUNCTION CHECK (OPTIONAL)................................................................................................ 3-12
9. BLUETOOTH FUNCTION CHECK (OPTIONAL) ................................................................................. 3-12
10. USB FUNCTION CHECK...................................................................................................................... 3-13
11. CD FUNCTION CHECK........................................................................................................................ 3-14
WAVEFORMS.................................................................................................................................................. 3-15
1. SERVO.................................................................................................................................................. 3-15
2. MOTOR DRIVE..................................................................................................................................... 3-16
3. AUDIO PATH ........................................................................................................................................ 3-17
4. ADC....................................................................................................................................................... 3-19
5. USB....................................................................................................................................................... 3-20
6. CRYSTAL.............................................................................................................................................. 3-21
WIRING DIAGRAM.......................................................................................................................................... 3-23
BLOCK DIAGRAM .......................................................................................................................................... 3-25
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-27
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-27
2. MAIN - MICOM CIRCUIT DIAGRAM.................................................................................................... 3-29
3. MAIN - MPEG CIRCUIT DIAGRAM...................................................................................................... 3-31
4. MAIN - RF SERVO CIRCUIT DIAGRAM.............................................................................................. 3-33
5. MAIN - I/O & ADC CIRCUIT DIAGRAM ............................................................................................... 3-35
6. MAIN - PWM & AMP CIRCUIT DIAGRAM ........................................................................................... 3-37
7. MAIN - DC/DC CIRCUIT DIAGRAM..................................................................................................... 3-39
8. VFD CIRCUIT DIAGRAM...................................................................................................................... 3-41
9. TOUCH CIRCUIT DIAGRAM................................................................................................................ 3-43
10. TOP JACK CIRCUIT DIAGRAM ........................................................................................................... 3-45
CIRCUIT VOLTAGE CHART........................................................................................................................... 3-47
1. ICs......................................................................................................................................................... 3-47
2. CAPACITORS....................................................................................................................................... 3-49
3. CONNECTORS..................................................................................................................................... 3-50
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-51
1. SMPS P.C.BOARD ............................................................................................................................... 3-51
2. MAIN P.C.BOARD ................................................................................................................................ 3-53
3. VFD/ TOUCH/ TOP JACK P.C.BOARD ............................................................................................... 3-57