LG FAS166F User manual

Micro Hi-Fi System
SERVICE MANUAL
MODEL: FA166 (FA166, FAS166F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: FA166 (FA166, FAS166F)SERVICE MANUAL
P/NO : AFN74972260 MARCH, 2011
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
SERVICE INFORMATION FOR EEPROM........................................................................................... 1-6
PROGRAM DOWNLOAD GUIDE........................................................................................................... 1-7
SPECIFICATIONS ..................................................................................................................................... 1-10
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

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
00
00
81
90
10
E0
08
1-6
SERVICE INFORMATION FOR EEPROM

1. AUDIO PROGRAM
Download program file name must be FA166_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.
1-7
PROGRAM DOWNLOAD GUIDE

2. CD PROGRAM
Download program file name must be HD000_DATE_00.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
↓
UPDATED
↓
POWER OFF AUTOMATICALLY ←
When completed, remove usb device .
1-8

3. TOUCH PROGRAM
Download program file name must be FX166_YYMMDDX_00.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
↓
WRITE 00 .. 100
↓
UPDATED
↓
POWER OFF AUTOMATICALLY ←
When completed, remove usb device .
1-9

SPECIFICATIONS
• GENERAL
Power requirements Refer to main label
Power consumption Refer to main label
Dimensions (W x H x D) 135 x 285 x 280.5 mm
Net Weight (Approx.) 3.4 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 5 % to 90 %
Bus Power Supply USB DC 5 V 500 mA
iPod DC 5 V 1 A
• INPUTS/ OUTPUTS
PORT. IN 0.5Vrms (3.5 mm stereo jack)
• TUNER
FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
• AMPLIFIER
Stereo mode 80 W + 80 W (4Ωat 1kHz)
• CD
Frequency Response 40 to 20 000 Hz
Signal-to-noise ratio 75 dB
Dynamic range 80 dB
• FRONT SPEAKER
Type 3 Way 4 speaker
Impedance Rated 4 Ω
Input Power 80 W
Max. Input Power 160 W
Net Dimensions (W x H x D) 132 x 320 x 300 mm
Net Weight 4.5 kg
•Design and specifications are subject to change without notice.
1-10

SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS..................................................................................................................................... 2-1
1. CABINET AND MAIN FRAME SECTION (FA166) ................................................................................... 2-3
2. DECK MECHANISM SECTION (SCP-03B).............................................................................................. 2-5
3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7
4. SPEAKER SECTION (FAS166F).............................................................................................................. 2-8
2-1

2-2
MEMO

2-3 2-4
C
I
G
D
F
L
JK
J
K
L
A
D
E
F
A
I
C
E
B
G
H
260L
260R
251 253
254
261
A47
A46
A49
263
A42
A43
A48
A44
267
268
300
262
CN351
CN702
CABLE1
CABLE2
CABLE4
SMPS
FRONT
AMP
MAIN
iPod
USB
B
CN001
464
464
462
462
445
462
265
462
462
462
462
A26
H
269
271
252
273
272
468
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION (FA166)
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.

2-5 2-6
2. DECK MECHANISM SECTION (SCP-03B)
A26
001
004
017
002
003
005
006
007
008
007
009
012
011
014
013
016
015
010
024
025
024
025
024
025
024
025 035A
030
432
033
032
031
431
021
A30
035
435
036

2-7
801 Owner’s Manual
804 Bag
802 Box
808 Battery
AAA
900 Remote Control
818 Stereo Cable
825 FM Wire Antenna
803 Packing
AAA
3. PACKING ACCESSORY SECTION

2-8
A60R
A60L
4. SPEAKER SECTION (FAS166F)

3-1
SECTION 3 ELECTRICAL
CONTENTS
TRAINING MASTER.......................................................................................................................................... 3-2
1. NO SOUND FROM SPEAKERS............................................................................................................. 3-2
2. NO SOUND IN PORT. IN FUNCTION.................................................................................................... 3-3
3. NO SOUND IN IPOD FUNCTION........................................................................................................... 3-4
4. NO SOUND IN AM/FM FUNCTION........................................................................................................ 3-5
5. NO SOUND IN CD FUNCTION .............................................................................................................. 3-6
6. NO SOUND IN USB FUNCTION............................................................................................................ 3-8
7. NO POWER ............................................................................................................................................ 3-9
ONE POINT REPAIR GUIDE .......................................................................................................................... 3-10
1. NO POWER PROBLEM ....................................................................................................................... 3-10
2. SPEAKER NO AUDIO OUTPUT .......................................................................................................... 3-11
3. USB NO DETECT................................................................................................................................. 3-12
4. NO BOOTING ....................................................................................................................................... 3-13
ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................. 3-14
1. POWER (SMPS) ................................................................................................................................... 3-14
2. P-SENS................................................................................................................................................. 3-15
3. VKK CHECK ......................................................................................................................................... 3-15
4. μ-COM PART CHECK-1 ....................................................................................................................... 3-16
5. μ-COM PART CHECK-2 ....................................................................................................................... 3-16
6. FLD DISPLAY CHECK ......................................................................................................................... 3-17
7. TOUCH PART CHECK ......................................................................................................................... 3-18
8. PWM MODULATION CHECK............................................................................................................... 3-19
9. POWER AMP PART CHECK ............................................................................................................... 3-20
10. TUNER FUNCTION CHECK................................................................................................................. 3-21
11. USB FUNCTION CHECK...................................................................................................................... 3-22
12. CD FUNCTION CHECK........................................................................................................................ 3-23
WAVEFORMS.................................................................................................................................................. 3-24
1. SERVO.................................................................................................................................................. 3-24
2. MOTOR DRIVE..................................................................................................................................... 3-24
3. AUDIO PATH ........................................................................................................................................ 3-25
4. ADC....................................................................................................................................................... 3-26
5. IPOD ..................................................................................................................................................... 3-26
6. USB....................................................................................................................................................... 3-27
7. CRYSTAL.............................................................................................................................................. 3-27
WIRING DIAGRAM.......................................................................................................................................... 3-29
BLOCK DIAGRAMS ........................................................................................................................................ 3-31
1. MAIN BLOCK DIAGRAM ...................................................................................................................... 3-31
2. SMPS BLOCK DIAGRAM..................................................................................................................... 3-33
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-35
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-35
2. MAIN-MICOM CIRCUIT DIAGRAM ...................................................................................................... 3-37
3. MAIN-ADC/IPOD CIRCUIT DIAGRAM ................................................................................................. 3-39
4. MAIN-MPEG(DSP) CIRCUIT DIAGRAM .............................................................................................. 3-41
5. MAIN-RF SERVO CIRCUIT DIAGRAM ................................................................................................ 3-43
6. MAIN-POWER CIRCUIT DIAGRAM..................................................................................................... 3-45
7. AMP CIRCUIT DIAGRAM..................................................................................................................... 3-47
8. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-49
9. FRONT JACK CIRCUIT DIAGRAM ...................................................................................................... 3-51
10. IPOD DOCKING CIRCUIT DIAGRAM .................................................................................................. 3-53
CIRCUIT VOLTAGE CHART........................................................................................................................... 3-55
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-57
1. MAIN P.C.BOARD ................................................................................................................................ 3-57
2. SMPS P.C.BOARD ............................................................................................................................... 3-59
3. AMP P.C.BOARD.................................................................................................................................. 3-61
4. FRONT P.C.BOARD ............................................................................................................................. 3-63
5. FRONT JACK P.C.BOARD................................................................................................................... 3-65
6. IPOD DOCKING P.C.BOARD............................................................................................................... 3-65

3-2
Are the speaker cables connected correctly
between the speaker terminals on the unit
and the speakers?
Make sure to connect the cables to each specified
connector tightly on the unit.
Connect the woofer cables to the WOOF SYSTEM
connectors on the rear panel.
YES
NO
Does the customer select correctly
the input function he or she wants to listen to?
Make sure to connect some cables like A/V cables
and FM/AM antenna cables.
YES
NO
After pressing FUNCTION,
is “CD, USB, Portable, IPOD, AM or FM” displayed?
Make sure to select the desired input function
pressing FUCTION button.
YES
NO
Turn the master volume clockwise
for the volume up.
The volume level LEDs around the master volume
will be turned on more and more
while turning it clockwise for the volume up.
YES
NO
Is there any sound from the selected input source?
(Portable, USB, TUNER or CD Disc)
Refer to a device’s instruction manual
and then check if there is sound output from it
connecting another audio system.
YES
NO
Are the sound spectrum level LEDs
on the left and right side of the front panel
being changed up and down
according to the sound input gain?
The sound spectrum level LEDs will be turned on/off
repeatedly at regular intervals. The speakers cables
might be short-circuited with the chassis ground.
Be careful not to be shorted each other.
YES
NO
The sound is output from the speakers.
YES
Sound OK
1. NO SOUND FROM SPEAKERS
TRAINING MASTER

3-3
Does the customer select correctly
the PORT. IN function he or she wants to listen to?
Make sure to connect a cable
between the PORT. IN jack of the unit and the Audio
output jack of a portable device like a MP3 player.
YES
NO
Is “PORT. IN” displayed on VFD? Make sure to select the PORT. IN function
pressing the FM(AM)/IPOD/PORT. IN button.
YES
NO
Turn the master volume clockwise
for the volume up.
The volume level LEDs around the master volume
will be turned on more and more
while turning it clockwise for the volume up.
YES
NO
Is there any sound
from the selected input source?
Refer to a portable device’s instruction manual
and then check if there is sound output
from it connecting another audio system.
YES
NO
Are the sound spectrum level LED’s
on the left and right side of the front panel
being changed up and down
according to the sound input gain?
The sound spectrum level LED’s will be turned on/off
repeatedly at regular intervals. A speaker cable
might be short-circuited with the chassis ground.
Be careful not to be shorted each other.
YES
NO
Are the speaker cables connected correctly
between the speaker terminals on the unit
and the speakers?
Make sure to connect the cables to each specified
connector tightly on the unit.
YES
NO
The sound is output
from the speakers.
YES
Sound OK
2. NO SOUND IN PORT. IN FUNCTION
TRAINING MASTER