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8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 1/55
3CD CHANGER
HI-FI SYSTEM
SERVICE MANUAL
MODEL: LM-U2350A, LMS-U2350
LM-U4050A, LMS-U4050, LMS-U4050W
LM-U5050A, LMS-U5050, LMS-U5050W, LMS-U5050S
S E RV I C E MAN UAL
M ODE L : L M- U2 3 5 0 A ,L M S - U2 3 5 0 ,L M- U4 0 5 0 A ,L M S - U4 0 5 0 ,L
M S - U4 0 5 0 W ,L M- U 5 0 5 0 A ,L M S - U 5 0 5 0 ,L M S - U 5 0 5 0 W ,L M S - U 5 0 5 0 S
CAUTIONBEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”IN THIS MANUAL.
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- 1-1 -
[CONTENTS]
SECTION 1. GENERAL
• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
• SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
SECTION 2. ELECTRICAL SECTION
• ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
• INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
• WIREING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43
• PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45
SECTION 3. EXPLODED VIEWS
• CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
• TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
• TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
• CD MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
SECTION 4. SPEAKER PART
• SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
SECTION 5. REPLACEMENT PARTS LIST
• REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
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- 1-2 -
SECTION 1. GENERAL
SERVICING PRECAUTIONS
I NOTES REGARDING HANDLING OF THE PICK-UP1. 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 notes1) 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 surfaceIf 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 this.
6) Never attempt to disassemble the pick-up.
Spring by 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 let
contact fingers or other exposed skin.
Magnet
How to hold the pick-up
Conductive Sheet
Cotton swab
Pressure
Pressure
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- 1-3 -
I NOTES REGARDING COMPACT DISC PLAYER REPAIRS1. Preparations1) 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 of humidity is high, where strong magnet-
ism is present, or where there is excessive dust.
2. Notes for repair1) 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 (1M Ω)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent sta-tic 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.
CLEARING MALFUNCTION
You can reset your unit to initial status if malfunction occur(button malfunction, display, etc.).Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside of
the volume knob for more than 3 seconds.
If you reset your unit, you must reenter all its settings(stations, clock, timer)
NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it.
2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord.
Resistor(1 Mohm)
Conductive
Sheet
Resistor
(1 Mohm)
Armband
RESET jump wire
VOLUME
VOLUME KNOB
DOWN
UP
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- 1-4 -
ESD PRECAUTIONS
I 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 shouldbe 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 sur-
face 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 areready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together byconductive 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 motionsuch as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen-
erate 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 “DAN-
GEROUS 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.
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- 1-5 -
SPECIFICATIONS
[ G
e n e r a l ]
[ C D ]
[ T u n e r ]
A M
F M
( M W )
[ S p e a k e r s
]
[ S u b w o o f e
r ]
[ T A P E ]
Power supply Refer to the back panel of the unit.
Power consumption 200 W 110 W
Weight 8.5 kg
External dimensions (W x H x D) 280 x 370 x 400 mmFrequency response 40 - 18000 Hz
Signal-to-noise ratio 75 dB
Dynamic range 70 dB
Tuning Range 87.5 - 108.0 MHz or 65 - 74 MHz, 87.5 - 108.0 MHz
Intermediate Frequency 10.7 MHz
Signal to Noise Ratio 60/55 dB
Frequency Response 60 - 10000 Hz
Tuning Range 522 - 1620 kHz or 520 - 1720 kHz
Intermediate Frequency 450 kHz
Signal to Noise Ratio 30 dB
Frequency Response 120 - 2000 Hz
Output Power Front : 270 W + 270 W (LM-U5050 model only)
250 W + 250 W (LM-U4050/U2350 model only)Surround : 110 W + 110 W (LM-U5050 model only)
Subwoofer : 350 W (LM-U5050/U4050 model only)
T.H.D 0.7%
Frequency Response 42 - 20000 Hz
Signal-to-noise ratio 80 dB
Tape Speed 3000 ± 3 % (MTT-111. NORMAL-SPEED)
Wow Flutter 0.25 % (MTT -111, JIS-WTD)
F.F/REW Time 120 sec (C-60)
Frequency Response 125 - 8000 Hz
Signal to Noise Ratio 40 dB
Channel Separation 50 dB (P/B)/45 dB (R/P)
Erase Ratio 55dB (MTT-5511)
Type Bass Reflex 3Way 3 Speaker Bass Reflex 2Way 2Speaker
Impedance 6Ω 24Ω
Frequency Response 55 - 20000 Hz 60 - 20000 Hz
Sound Pressure Level 86 dB/W (1m) 86 dB/W (1m)
Rated Input Power 270 W 250 W 110 W
Max. Input Power 540 W 500 W 220 W
Net Dimensions (W x H x D) 250 X 300 X 415 mm 187 X 258 X 415 mm
Weight 9.3 kg 4.3 kg
Speaker Name Subwoofer (LMS-U5050W/U4050W)
Type 1 Way 1 Speaker
Impedance 6Ω
Frequency Response 45 - 15000 HzSound Pressure Level 84 dB/W (1m)
Rated Input Power 350 W
Max. Input Power 700 W
Net Dimensions (W x H x D) 279 X 320 X 415 mm
Weight 10.0 kg
LM-U5050MODELSECTION LM-U4050 LM-U2350
[ A m p
]
Front speaker (L/R)LMS-U5050 LMS-U4050/U2350
Surround speaker (L/R)[LMS-U5050S]
Speaker Name
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- 2-1 -
SECTION 2. ELECTRICAL
ELECTRICAL TROUBLESHOOTING GUIDE
I SMPS POWER CIRCUIT
P-SENS PART
VKK CHECK
SMPS ASSY CN902 © 7PIN 5.1V CHECK
MAIN PCB CN710 7PIN 5.1V CHECK
MAIN PCB CN304 5PIN 5.1VCHECK
FRONT PN302 36PIN 5.1VCHECK
FRONT IC306(RESET IC)
STATE CHECK
U-COM IC304 26PIN 5VCHECK
SMPS TROUBLESHOOTING CONSULT
CN710 CONNECTION STATE CHECK
MAIN PCB PATTERN CUTTING AND
SHORT CHECK
IC306 INPUTVOLTAGE4V,
OUTPUTVOLTAGE.2.1VSTATECHECK
IC306 KIA7042 CHANGE
NO
NO
NO
YES
YES
YES
YES
YES
CN710 10PIN DC -33V CHECK
IC304 51PIN VOLTAGE CHECK
SMPS TROUBLESHOOTING CONSULTNO
YES
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- 2-2 -
MICOM (IC301) CHECK
P-CTRL CHECK
"P-SENS" CHECK
"RESET" IC304 11 PIN CHECK(HIGH © LOW© HIGH)
X301 VIBRATION SIGNAL CHECK
IC301 CHANGE
PN302 33 PIN "P-CTRL" CHECK (HIGH)
CN710 5 PIN CHECK
SMPS TROUBLESHOOTING CONSULT
IC304 VDD(17,46,72,90) PIN VOLTAGE
CHECK
P-SENS TROUBLESHOOTING CONSULT
Q303 STATE CHECK
TR "Q303" CHANGE
SMPS TROUBLESHOOTING CONSULT
MICOM IC304 STATE CHECK
SMPS + MAIN BORD-TO-BORD CHECK
MAIN CN710 6 PIN CHECK
PN302 35 PIN +5.6V(MI) CHECK
X301 CHANGE
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
YES
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- 2-3 -
MUTING TROUBLESHOOTING (MUTE STATE)
EXPEND IC(IC305/501/502) STATE
Q752(A102) BASE "HIGH"
Q701, Q751(D1302) BASE "HIGH"
CHECK
16 PIN VDD VOLTAGE CHECK
3 "EXP-CLK" CHECK
2 "EXP-DATA" CHECK
4 PIN ~ 15 PIN EACH PORT STATE
CHECK
EXPEND IC OK
MUTE
EXPEND IC(IC305) 5PIN HIGH STATECHECK
Q752(A102)STATE CHECK
Q752(A102) FAULTY IS CHANGE
EACH PART TR CHANGE
D332/D553/D551(1SS133) CHECK
D332/D553/D551(1SS133)
CHANGE
PCB PATTERN CHECK
PCB PATTERN CHECK
MICOM (IC304) 4/84/85 PIN
CHECK(CLK1/2/3)
MICOM (IC304) 3 PIN CHECK
EXPEND IC FAULTY IS CHANGE
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
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- 2-4 -
SPECIFIC FUNCTION MODE HAS NO SOUND (NJW1190) IC601
IC201 INPUT CHECK(HEAD
INPUT)"A"DECK 32,39 "B"DECK 34,37
DECK HEAD WIRECONNECTION STATE CHECK
IC502 10PIN(PB MUTE) STATE
STATE CHECK
IC502 4PIN(REC SW) "LOW"
STATE REC
Q212 (C) "HIGH" CHECK
Q213 (C) "LOW" CHECK
IC502 13 PIN "REC-BAIS" HIGHCHECK
L203(4.7MH) COIL VIBRATION
SIGNAL CHECK
IC601 7 /32 INPUT REC'
SIGNAL CHECK
IC502 4PIN(REC SW) "HIGH"
CHECK
IC601(NJW1190)
TROUBLESHOOTING CONSULT
IC502 2 PIN/3 PINCHECK(DATA/CL
IC502 16 PIN VDD CHECK
IC502 EXPEND IC CHANGE
IC201 OUTPUT CHECK(5,26 PIN)
IC601 3,36PIN INPUT SIGNAL CHECK
IC601 17,22 PIN OUTPUT SIGNALCHECK
DECK OUTPUT
1)
1)
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
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- 2-5 -
AUX
JK601 SIGNALINPUT CHECK
IC601 5,34 PIN SIGNALINPUTCHECK
IC601 17,22 PIN OUTPUT SIGNAL
CHECK
MAIN PCB PATTERN CHECK
IC601(NJW1190)
TROUBLESHOOTING CONSULT
MAIN PCB PATTERN CHECK
IC601(NJW1190)
TROUBLESHOOTING CONSULT
AUX OUTPUT
CD
CN709 1,3PIN SIGNALCHECK CD
TROUBLESHOOTINGCONSULT
IC601 4,35PIN SIGNALINPUTCHECK
IC601 17,22 PIN OUTPUT SIGNAL
CHECK
CD OUTPUT
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
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- 2-6 -
TUNER
TU101 3 /5 SIGNAL CHECK
IC601 2,37 PIN SIGNALINPUTCHECK
IC601 17,22 PIN OUTPUT SIGNAL
CHECK
TU101 2 PIN "+9V"
VOLTAGE CHECK
TU101 6,7,8,9 PIN CHECK
(PLL-CE, PLL-DI, CLK, PLL-DO)
TUNER MODULE CHANGE
TUNER OUTPUT
MIC
CN303 7 PIN "MIC-SIGNAL" CHECK
IC601 44 PIN SIGNAL CHECK(OW601
PATTERN)
IC601 17,22 PIN OUTPUT SIGNAL
CHECK
CN303 4 MIC-SENSE CHECK
PN400 3 PIN "+12V"CHECK
TR CHANGE
MIC MUTE CHECK(Q409/ Q408)
IC402 8 PIN SIGNAL INPUT CHECK
PN400 9 "VOL-IN"CHECK
IC402 2 PIN SIGNAL INPUT CHECK
PN400 10 PIN "VOL-OUT"CHECK
MIC OUTPUT
<MIC PCB>
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
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- 2-7 -
IC601(NJW1190) TROUBLESHOOTING
IC601 24PIN VOLTAGE INPUT CHECK
IC601 19,20 SDA, SCA PULSE WAVE
CHECK (VOL UP, DOWN TURN CHECK)
IC601 17.22 PIN WAVE OUTPUT CHECK
IC601 OK
FUNCTION INPUT PORT SIGNAL
CHECK(NJW1190 TROUBLESHOOTING)
SMPS VOLTAGE CHECK CONSULT
IC301 10,8PIN CHECK
IC301 TROUBLESHOOTING
IC601 CHANGE
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
AMP MODULE TROUBLESHOOTING
IC501 9 PIN(AMP-PWR)HIGH CHECK
EXPEND IC TROUBLESHOOTING CONSULT
PROTECTION " HIGH"© SMPS VOLTAGE
AND AMP ON/ OFF STATE CHECK
AMP MODULE CHECK : MOS FET BOTH
ARE READ SHORT© AMP DEAD
AMP MODULE CHANGE
IC305 9 PIN(AMP-PWR) HIGH CHECK
IC701 11 PIN "AMP-ON/OFF" HIGHCHECK
IC701 12 PIN "PROTECTION" LOWCHECK
PN702 3 PIN "PROTECTION"CHECK
(HIGH © LOW)NO
NONO
IC701 3 ,20 & 5 ,18 EACH +65V &-65V
CHECK
SMPS TROUBLESHOOTING CONSULTYESNO
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- 2-8 -
IC701 9 ,14 ±9V CHECK
IC701 10 , 13 INPUT SIGNAL CHECK
IC701 5 ,17 OUTPUT SIGNAL CHECK
OK
SMPS TROUBLESHOOTING CONSULT
REC INPUTCHECK CHECK
INPUT LINE CHECK
IC202 4PIN STATECHECK
Q205 BASE 0.6V CHECK
VOLTAGE CHECK CONSULT
IC202 TROUBLESHOOTING CHECK
Q204 CHANGE
L203 CHANGE
Q204 COLLECTOR LOW
Q203 CHANGE
OK
REC OUTPUTCHECK AFTER FAULTY IS ICCHANGE
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
REC CHECK (Q252,Q202 ON :R273,R223 HIGH)
IC601 24PIN VOLTAGE INPUT CHECK
IC201 7,24 PIN INPUT CHECK
IC201 10.21 PIN OUTPUT CHECK
L203 2,3PIN CHECK
IC202 14 PIN STATESTATE CHECK
Q213.212 STATE STATECHECK
DECK CHANGE
IC401 EACH INPUTTUNER6,39.TAPE.
7.38.CD. 8.38.AUX.9.36 PIN SIGNAL
INPUT CHECK
NO
NO
NO
NO
NO
NO
NO
NO
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- 2-9 -
DUBBING CHECK ("NORMAL OR REC"//"HIGH")
IC401 11,34 OUTCHECK
REC INPUTCHECK CHECK
INPUT LINE CHECK
IC201 7,24 PIN INPUT CHECK
IC201 10.21PIN OUTPUT CHECK
IC401 EACH INPUTTUNER6,39.TAPE.
7.38.CD.8.38.AUX.9.36PIN SIGNAL
INPUT CHECK
YES
YES
YES
NO
NO
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- 2-10 -
INTERNAL BLOCK DIAGRAM of ICs
• HA12237FBLOCK DIAGRAM
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• NJW1190BLOCK DIAGRAM
• AF330W20FSBLOCK DIAGRAM
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PIN CONFIGURATION
PIN DESCRIPTION
Pin Number Symbol Type Description
1 L_DO O L-Channel Drain Output
2 SUBGND G Sub Ground
3 VDD_L P L-Channel Positive supply Voltage
4 L_GND P L-Channel Signal Ground
5 VSS_L O L-Channel Negative supply Voltage
6 L_OUT G L-Channel Audio Output
7 AM_F1 I AM Mode control Input 1
8 L_CS I L-Channel Current Sense Input9 VCC P Positive supply Voltage
10 L_IN I L-Channel Audio Input
11 STANDBY I ON/OFF control
12 P_STATE O Protection State
13 R_IN I R-Channel Audio Input
14 VEE P Negative supply Voltage
15 R_CS I R-Channel Current Sense Input
16 AM_F2 I AM Mode control Input 2
17 R_OUT G R-Channel Audio Output
18 VSS_R O R-Channel Negative supply Voltage
19 R_GND P R-Channel Signal Ground20 VDD_R P R-Channel Positive supply Voltage
21 SUBGND G Sub Ground
22 R_DO O R-Channel Drain Output
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• AF350W01FSBLOCK DIAGRAM
PIN CONFIGURATION
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PIN DESCRIPTION
Pin Number Symbol Type Description
1 N_DO O NMOS Drain Output
2 VSS P Negative supply Voltage3 N_CS I NMOS Current Sense Input
4 P_CS I PMOS Current Sense Input
5 NC
6 NC
7 VEE P Negative supply Voltage
8 STANDBY I ON/OFF control
9 IN I Audio Input
10 P_STATE O Protection State
11 VCC P Positive supply Voltage
12 OUT O Audio Output
13 GND G Signal Ground
14 SUBGND G Sub Ground
15 VDD P Positive supply Voltage
16 P_DO O PMOS Drain Output
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 22/55
2-15 2-16
BLOCK DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 23/55
2-17 2-18
WMA_USB BLOCK DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 24/55
2-19 2-20
SCHEMATIC DIAGRAMS
• FRONT SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 25/55
2-222-21
• MAIN SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 26/55
2-23 2-24
• DECK SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 27/55
2-262-25
• MIC SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 28/55
2-27 2-28
• USB_AUX2_H/P SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 29/55
2-302-29
• WOOFER AMP SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 30/55
2-31 2-32
• AMP SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 31/55
2-342-33
• POWER SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 32/55
2-35 2-36
• POWER SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 33/55
2-37 2-38
• SUB POWER SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 34/55
2-39 2-40
• CDP SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 35/55
2-41 2-42
• USB SCHEMATIC DIAGRAM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 36/55
2-43 2-44
WIRING DIAGRAMS
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 37/55
PRINTED CIRCUIT DIAGRAMS
• MAIN P.C. BOARD
2-45 2-46
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 38/55
2-47 2-48
• MAIN AMP P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 39/55
2-49 2-50
• MAIN AMP P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 40/55
2-51 2-52
• FRONT P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 41/55
2-53 2-54
• CDP P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 42/55
2-55 2-56
• CDP P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 43/55
2-57 2-58
• POWER P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 44/55
2-59 2-60
• POWER P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 45/55
2-61 2-62
• SUB POWER P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 46/55
2-63 2-64
• WOOFER AMP P.C. BOARD
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 47/55
2-65 2-66
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 48/55
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 49/55
3-43-3
• TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK)
025504
023
015
022
019
037
021
020
505
018
017
016
506
006
A01
402008
401
001
002
003
502
507
501
502
402
401
009
401
009
011
013
A02
403
007L OC A. N O. L G PA RT N O. D ESC RI PT IO N SP EC IF IC AT IO N
A00 6720AG0009A DECK,AUDIO CWN42RR05 TOKYO PIGEON L-DOUBL
A01 6768R-UP04A DECK MECHANISM PARTS 50-093-41285 PIGEON UNIT
A02 6768R- EP05A DECK MECH AN ISM PARTS 50-093 -41234 PIG EON H EAD ASSY
001 6768R- BP03D DECK MECH AN ISM PARTS 02-08 3-4254 PIG EON BELT /FELT C
002 6768R- BP03E DECK MECH AN ISM PARTS 02-08 3-4256 PIG EON BELT /FELT C
003 6768R- PP03A DECK MECH AN ISM PARTS 33-16 0-4309 PIG EON PRESS CASSE
006 6768R- QP04A DECK MECH AN ISM PARTS 50-09 3-41299 PIG EON MOTO R( ASSY
007 6768RZ GP01A DECK MECH AN ISM PARTS 50-22 2-41226 PIG EON A/R A/R G E
008 6768R- SP01F DECK MECH AN ISM PARTS 01-08 2-4598 PIG EON SPRING CW L4
009 6768R- MP01C DECK MECH AN ISM PARTS 50-21 9-4014 PIG EON MO LD CW L44
011 6768R- SP01A DECK MECH AN ISM PARTS 01-08 1-4601 PIG EON SPRING CW L4
013 6768R- SP03A DECK MECH AN ISM PARTS 01-08 2-4686 PIG EON SPRING CRM4
015 6768R-AP01A DECK MECHANISM PARTS 50-268-3016 PIGEON ARM CWL44
016 6768R- GP01H DECK MECH AN ISM PARTS 50-09 3-4503 PIG EON G EAR CRL442
017 6768R-AP01C DECK MECHANISM PARTS 50-239-4072 PIGEON ARM CWL44
018 6768R- GP01J DECK MECH AN ISM PARTS 50-22 2-4428 PIG EON G EAR CRL442
019 6768R- SP01P DECK MECH AN ISM PARTS 01-08 1-4678 PIG EON SPRING CRL4
020 6768R- BP01C DECK MECH AN ISM PARTS 02-08 3-4188 PIG EON BELT /FELT C
021 6768R- LP01C DECK MECH AN ISM PARTS 50-22 3-4429 PIG EON PULLEY/F LYW
022 6768R- VP03A DECK MECH AN ISM PARTS 50-09 3-4748 PIG EON SO LENOI D AS
023 6768R- GP03A DECK MECH AN ISM PARTS 50-09 3-4810 PIG EON G EAR ASSY C
025 6768R- JP03 B DECK MECH AN ISM PARTS 50-09 3-31009 PIG EON PULL EY/F LY
037 6768R- JP03 A DECK MECH AN ISM PARTS 50-09 3-4674 PIG EON PULLEY/F LYW
401 6768R- CP01B DECK MECH AN ISM PARTS GSE20A2005 PIG EO N SCREW CWL4 4
402 6768R- CP01A DECK MECH AN ISM PARTS GSE10A2003 PIG EO N SCREW CWL4 4
403 6768R- CP01D DECK MECH AN ISM PARTS GSL10A1704 PIG EON SCREW CW L44
501 6768R- WP03 A DECK MECH AN ISM PARTS GW N19S035040 PIG EON WASH ER CRM
502 6768R- WP03 B DECK MECH AN ISM PARTS 03-00 0-4532 PIG EON WASH ER C RM4
504 6768R- WP01 D DECK MECH AN ISM PARTS GW P21X045020 PIG EO N WASHER CW L
505 6768R- WP01 E DECK MECH AN ISM PARTS GW P12X030040S PIGEO N WASHER CW
506 6768R- WP01 H DECK MECH AN ISM PARTS GW P23X040020 PIG EO N WASHER CW L
507 6768R- WP01 F DECK MECH AN ISM PARTS GW N21X040040 PIG EON WASH ER CWL
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 50/55
3-5 3-6
• TAPE DECK MECHANISM (A/R & A/S : LEFT A/R DECK)
016
401
018007
035
008
015
023
019
021
034
020
505
017
403
504
025
033
502
009
401
003
501
401
011
013
009
022
A03
L OC A. N O. L G PA RT N O. D ESC RI PT IO N SP EC IF IC AT IO N
A00 6720AG0009A DECK,AUDIO CWN42RR05 TOKYO PIGEON L-DOUBL
A01 6768R-UP04A DECK MECHANISM PARTS 50-093-41285 PIGEON UNIT
A03 6768RZ EP04 A DECK MECH AN ISM PART S 50-093 -41238 PIG EON A/R A/R H E
001 6768R- BP03D DECK MECH AN ISM PART S 02-083 -4254 PIG EON BELT /FELT C
002 6768R- BP03E DECK MECH AN ISM PART S 02-083 -4256 PIG EON BELT /FELT C
003 6768R- PP03A DECK MECH AN ISM PART S 33-160 -4309 PIG EON PRESS CASSE
006 6768R- QP04A DECK MECH AN ISM PART S 50-093 -41299 PIG EON MOTO R( ASSY
007 6768RZ GP01A DECK MECH AN ISM PART S 50-222 -41226 PIG EON A/R A/R G E
008 6768R- SP01F DECK MECH AN ISM PART S 01-082 -4598 PIG EON SPRING CW L4
009 6768R- MP01C DECK MECH AN ISM PART S 50-219 -4014 PIG EON MO LD CW L44
011 6768R- SP01A DECK MECH AN ISM PART S 01-081 -4601 PIG EON SPRING CW L4
013 6768R- SP03A DECK MECH AN ISM PART S 01-082 -4686 PIG EON SPRING CRM4
015 6768R-AP01A DECK MECHANISM PARTS 50-268-3016 PIGEON ARM CWL44
016 6768R- GP01H DECK MECH AN ISM PART S 50-093 -4503 PIG EON G EAR CRL442
017 6768R- AP01C DECK MECH AN ISM PART S 50-239 -4072 PIG EON ARM CW L44
018 6768R- GP01J DECK MECH AN ISM PART S 50-222 -4428 PIG EON G EAR CRL442
019 6768R- SP01P DECK MECH AN ISM PART S 01-081 -4678 PIG EON SPRING CRL4
020 6768R- BP01C DECK MECH AN ISM PART S 02-083 -4188 PIG EON BELT /FELT C
021 6768R- LP01C DECK MECH AN ISM PART S 50-223 -4429 PIG EON PULLEY/F LYW
022 6768R- VP03A DECK MECH AN ISM PART S 50-093 -4748 PIG EON SO LENOID AS
023 6768R- GP03A DECK MECH AN ISM PART S 50-093 -4810 PIG EON G EAR ASSY C
025 6768R- JP03 B DECK MECH AN ISM PART S 50-093 -31009 PIG EON PULLEY/F LY
033 6768RZ BP01 A DECK MECH AN ISM PART S 02-083 -4232 PIG EON A/R A/R BEL
034 6768RZ LP01A DECK MECH AN ISM PART S 50-093 -41187 PIG EON A/R A/R PU
035 6768RZ LP02A DECK MECH AN ISM PART S 50-223 -4933 PIG EON A/R A/R PUL
037 6768R- JP03 A DECK MECH AN ISM PART S 50-093 -4674 PIG EON PULLEY/F LYW
401 6768R- CP01B DECK MECH AN ISM PART S GSE20A2005 PIG EO N SCREW CWL4 4
402 6768R- CP01A DECK MECH AN ISM PART S GSE10A2003 PIG EO N SCREW CWL4 4
403 6768R- CP01D DECK MECH AN ISM PART S GSL10A1704 PIG EON SCREW CW L44
501 6768R- WP03 A DECK MECH AN ISM PART S GW N19S035040 PIG EON WASH ER C RM
502 6768R- WP03 B DECK MECH AN ISM PART S 03-000 -4532 PIG EON WASH ER C RM4
504 6768R- WP01 D DECK MECH AN ISM PART S GW P21X045020 PIG EO N WASHER CW L
505 6768R- WP01 E DECK MECH AN ISM PART S GW P12X030040S PIGEO N WASHER CW
506 6768R- WP01 H DECK MECH AN ISM PART S GW P23X040020 PIG EO N WASHER CW L
507 6768R- WP01 F DECK MECH AN ISM PART S GW N21X040040 PIG EON WASH ER C WL
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 51/55
3-83-7
LOCA.NO. PART NO DESCRIPTION SP ECIFICATION
A26 4405RCE008G MECHANISM ASSEMBLY CDM-H1543 3 CD CHANGER (SPRING
A30 3041RBM001A BASE ASSEMBLY PU(SPRING DAMPER) SS P/UP
A35 6717R-A002A PICK UP ASSEMBLY CMS-D77SG6 SAMSUNG FRONT LOADI
151 3390RB0002A TRAY DISC(CDM-H1503)
153 4470RB0005A GEAR TRAY (CDM-H1503)
155 4681RBA001C MOTOR ASSEMBLY HOME TRAY (CDM-H1503) MABUCHI
1 56 68 71R F92 11 A PWB( PC B) ASSE MBLY, FRO NT 1 503 T/ D SEN SO R
159 3390RB0001B TRAY DECK/MECHA CDM-H1503 MOLD LOAD
162 4400R-0012A BELT DECK/MECHA MAIN CDM-H1503V OTH
163 4470R-0190A GEAR DECK/MECHA PULLEY CDM-H1503V M
164 4470RB0003A GEAR LOADING (CDM-H1503)
165 6871RZ7036A PWB(PCB) ASSEMBLY,OTHERS CDM-H1503 UP/DW/OP/CL
166 4470RB0006A GEAR PU UP (CDM-H1503)
167 4470RB0007A GEAR PU DOWN (CDM-H1503)
168 4470RB0002A GEAR CAM (CDM-H1503)
169 4860RB0002B CLAMP HOME CDM-H1503 MOLD CLAMP ASSY
170 3550R-0685A COVER DECK/MECHA GUIDE MOTOR CDM-H15
172 3040RB0005A BASE MAIN (CDM-H1503)
173 4510RB0001A LEVER S/W CLOSE175 4681RBA002A MOTOR ASSEMBLY HOME LOADING (PULLEY 8.6)
177 4470RB0001A GEAR MAIN (CDM-H1503)
184 4900RB0002A DAMPER HOME 3CD CHANGER MOLD RUBBER
185 3040SB0003A BASE PU(CDM-H1303)
186 4970RB0001A SPRING COIL 3 CD CHANGER
187 4970RB0001B SPRING COIL 50 3CD CHANGER
416 88H-0004 CD MECHA PARTS 3X12X12FNM
417 88H-0002 CD MECHA PARTS 3X9X12FZMY
418 353-025BAAA "SCREW,DRAWING" #NAME?
419 88H-0003 CD MECHA PARTS 3X12X10FZMY
421 6756SBX001A CD MECHANISM PARTS SCREW 2.6X10X10XFZMY CDM-H813
422 353-028H SCREW #NAME?
416
151
156
418
169
173
419
170
163
422
165
159
164
417
417
416
166
167
177
172
162
153
168
155
175
• CD MECHANISM
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 52/55
- 4-1 -
SECTION 4. SPEAKER SECTION
MODEL: LMS-U2350, LMS-U4050, LMS-U5050
WIRE 80
865
851
864
869866
850
852
868
853
855
854
A80
856
870851
(LEFT)
(RIGHT)
863862
857
860
(LEFT)
867
859
858
WIRE 81
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 53/55
- 4-2 -
MODEL: LMS-U5050W, LMS-U4050W
750
WIRE71
WIRE 72
752
772
783
751
762
A70
A75
760
770
754756
755
758
757
759761
753
771
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 54/55
- 4-3 -
MODEL: LMS-U5050S
WIRE 62
WIRE 61651
650
661
660
659
658
655
663
654653
A60
662
WIRE 63
665 (RIGHT)
(LEFT)
657
656
(RIGHT)
(LEFT)
8/6/2019 LG LM-U2350 LM-4050 LM-5050A SERVICE MANUAL
http://slidepdf.com/reader/full/lg-lm-u2350-lm-4050-lm-5050a-service-manual 55/55