LG FA162 User manual

Micro Hi-Fi System
SERVICE MANUAL
MODEL: FA162 (FA162N, FAS162F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: FA162 (FA162N, FAS162F)SERVICE MANUAL
P/NO : AFN75914299 JANUARY, 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
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
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).
HIDDEN KEY MODE

POWER ON
FLD no disc status
Remote control ‘ ’ + Front ‘STOP’
push same timing during 5s
FLD ‘OP-0….
Move to appropriate position
and make changes
with Rmc ‘ ▶/REPEAT’ key.
Press STOP key
FLD ‘write ok’
Remote control ‘ ’ +
Front ‘STOP’ 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
03
00
81
81
10
00
00
1-7
SERVICE INFORMATION FOR EEPROM

1. AUDIO PROGRAM
Download program file name must be FA162_YYMMDDX.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
READ
↓
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 HF300_DATE_00_ALL.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
↓
FIRMWARE
↓
FINISH
↓
POWER OFF MANUALLY ←
When completed, remove usb device .
1-9

3. TOUCH PROGRAM
Download program file name must be TC380_LG_FA162_YYMMDD_0.dld
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
↓
FIRMWARE
↓
T-WRT 00 .. 100
↓
POWER OFF AUTOMATICALLY ←
When completed, remove usb device .
1-10

4. EQ PROGRAM
Download program file name must be EQ_PRG_FA162N_YYMMDDX_814F.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
↓
EQ_DOWN
↓
POWER OFF AUTOMATICALLY ←
When completed, remove usb device.
1-11

SPECIFICATIONS
• GENERAL
Power supply Refer to the back panel of the unit.
Power consumption Refer to the back panel of the unit.
Net Weight 3.31 kg
External dimensions (WxHxD) 170 x 253 x 265 mm
• CD
Frequency response 65 - 20 000 Hz
Signal-to-noise ratio 75 dB
Dynamic range 75 dB
• TUNER (FM)
Tuning Range 87.5 - 108.0 MHz or 65 - 74 MHz, 87.50 - 108.00 MHz
Intermediate Frequency 10.7 MHz
Signal to Noise Ratio 60/55 dB (Mono)
Frequency Response 65 - 10 000 Hz
• AMPLIFIER
Output Power 80 W + 80 W
T.H.D 0.5 %
Frequency Response 65 - 20 000 Hz
Signal-to-noise ratio 75 dB
• SPEAKERS
Type 3 Way 3 Speaker
Impedance 4 Ω
Frequency Response 70 - 20 000 Hz
Sound Pressure Level 83 dB/W (1 m)
Rated Input Power 80 W
Max. Input Power 160 W
Net Dimensions (WxHxD) 128 x 295 x 240 mm
Net Weight (1EA) 4.0 kg
•Design and specifications are subject to change without notice.
1-12

SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS..................................................................................................................................... 2-1
1. CABINET AND MAIN FRAME SECTION (FA162N) ................................................................................ 2-3
2. DECK MECHANISM SECTION (DP-12AM) ............................................................................................. 2-5
3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7
4. SPEAKER SECTION (FAS162F).............................................................................................................. 2-8
2-1

2-2
MEMO

B
F
D
H
C
E
H
A
A
C
D
EF
464
464
464
464
464
464
464
464
274
262
276
265
273
464
266
263
505
A47
A46
A44
464
464
256
255
300
464
252
253
A42
A43
261
464
CABLE1
CABLE3
B
MAIN
SMPS
FRONT
464
264
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION (FA162N)
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. MECHANISM DECK SECTION (DP-12AM)
A02
439
018
013
017
014
020
016
440
015
015B
015A
435
A01
026
001
002
012
012
037
012A
019 442
442
A03
003
010
MEMO

805 Clear Sheet
804 Bag
802 Box
900 Remote Control
803 Packing
825 FM Wire Antenna
808 Battery
AAA
AAA
801 Owner’s Manual
3. PACKING ACCESSORY SECTION

A60R
A60L
4. SPEAKER SECTION (FAS162F)

3-1
SECTION 3
ELECTRICAL
CONTENTS
TONE POINT REPAIR GUIDE .......................................................................................................................... 3-2
1. NO POWER PROBLEM ......................................................................................................................... 3-2
2. SPEAKER NO AUDIO OUTPUT ............................................................................................................ 3-3
3. USB NO DETECT................................................................................................................................... 3-4
4. NO BOOTING ......................................................................................................................................... 3-5
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART..................................................................... 3-6
1. μ-COM PART CHECK-1 ......................................................................................................................... 3-6
2. FLD DISPLAY CHECK ........................................................................................................................... 3-7
3. TOUCH PAD CHECK ............................................................................................................................. 3-8
4. PWM MODULATION PART.................................................................................................................... 3-9
5. POWER AMP PART CHECK ............................................................................................................... 3-10
6. AUX FUNCTION CHECK ..................................................................................................................... 3-11
7. TUNER FUNCTION CHECK................................................................................................................. 3-12
8. SMPS POWER CIRCUIT...................................................................................................................... 3-13
ELECTRICAL TROUBLESHOOTING GUIDE OF CD PART ......................................................................... 3-16
1. POWER CHECK GUIDE ...................................................................................................................... 3-16
2. CD PART .............................................................................................................................................. 3-17
3. OPEN CLOSE NG ................................................................................................................................ 3-18
4. “ READING ” DISPLAY CHECK (= ONLY “CD” DISPLAY).................................................................. 3-18
5. READING OK CHECK (= “NO DISC” DISPLAY) ................................................................................. 3-19
6. USB PART ............................................................................................................................................ 3-23
WAVEFORMS OF MAJOR CHECK POINT.................................................................................................... 3-24
WIRING DIAGRAM.......................................................................................................................................... 3-29
BLOCK DIAGRAMS ........................................................................................................................................ 3-31
1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-31
2. SMPS BLOCK DIAGRAM..................................................................................................................... 3-33
3. POWER DIAGRAM............................................................................................................................... 3-35
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-37
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-37
2. MAIN - MICOM CIRCUIT DIAGRAM.................................................................................................... 3-39
3. MAIN - DSP CIRCUIT DIAGRAM......................................................................................................... 3-41
4. MAIN - SERVO CIRCUIT DIAGRAM.................................................................................................... 3-43
5. MAIN - AMP CIRCUIT DIAGRAM......................................................................................................... 3-45
6. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-47
7. TOUCH CIRCUIT DIAGRAM................................................................................................................ 3-49
8. TOUCH SLIDE CIRCUIT DIAGRAM .................................................................................................... 3-50
CIRCUIT VOLTAGE CHART........................................................................................................................... 3-51
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-53
1. SMPS P.C.BOARD ............................................................................................................................... 3-53
2. MAIN P.C.BOARD ................................................................................................................................ 3-55
3. FRONT P.C.BOARD ............................................................................................................................. 3-59
4. TOUCH P.C.BOARD............................................................................................................................. 3-61
5. TOUCH SLIDE P.C.BOARD ................................................................................................................. 3-61