LG LMSU-1060, LMU-1060 Service manual

MANUAL SERVICE

U1060-U1060/LMS-LM : MODEL

P/NO : AFN30721349	JUNE,2006

3CD CHANGER MINI Hi-Fi SYSTEM

SERVICE MANUAL

MODEL : LM-U1060/LMS-U1060

[CONTENTS]

SECTION 1. GENERAL

• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

• SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

SECTION 2. ELECTRICAL

• ELECTRICAL TROUBLESHOOTING GUIDE(AUDIO PART) . . . . . . . . . . . . . . . . . . . . . . . . 2-1

• INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

• ELECTRICAL TROUBLESHOOTIHG GUIDE & WAVEFORM(CD PART) . . . . . . . . . . . . . . 2-22

• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38

• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40

• PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54

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
• SPEAKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-9

SECTION 4. REPLACEMENT PARTS LIST

• REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

- 1-1 -

SECTION 1. GENERAL

SERVICING PRECAUTIONS

■ NOTES REGARDING HANDLING OF THE PICK-UP

1.Notes for transport and storage

1)The pick-up should always be left in its conductive bag until immediately prior to use.

2)The pick-up should never be subjected to external pressure or impact.

Storage in conductive bag

Drop impact

2.Repair notes

1)The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2)The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board.

3)Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched.

4)Laser beams may damage the eyes!

Absolutely never permit laser beams to enter the eyes!

Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

NEVER look directly at the laser beam, and don’t let contact fingers or other exposed skin.

5)Cleaning the lens surface

If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this.

Magnet	Pressure
	Pressure

How to hold the pick-up

Cotton swab

Conductive Sheet

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.

-1-2 -

■ 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 of humidity is high, where strong magnetism is present, or where there is excessive dust.

2. Notes for repair

1)Before replacing a component part, first disconnect the power supply lead wire from the unit

2)All equipment, measuring instruments and tools must be grounded.

3)The workbench should be covered with a conductive sheet and grounded.

When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is because there is the possibility of damage by static electricity.)

4)To prevent AC leakage, the metal part of the soldering iron should be grounded.

5)Workers should be grounded by an armband (1M Ω)

6)Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent static electricity changes in the clothing to escape from the armband.

7)The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Armband

Resistor

(1 Mohm)

Resistor

(1 Mohm)

Conductive

Sheet

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.

	VOLUME
UP	RESET jump wire

VOLUME KNOB

DOWN

- 1-3 -

ESD PRECAUTIONS

■ Electrostatically Sensitive Devices (ESD)

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

1.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test.

2.After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3.Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4.Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges sufficient to damage ESD devices.

5.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD devices.

6.Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials).

7.Immediately before removing the protective material from the leads of a replacement ESD device, touch the protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER SAFETY PRECAUTIONS.

8.Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

- 1-4 -

SPECIFICATIONS

[GENERAL]

Power supply Power consumption Net Weight

External dimensions (W x H x D)

[CD]

Frequency response Signal-to-noise ratio Dynamic range

[TUNER] FM

Tuning Range Intermediate Frequency Signal to Noise Ratio Frequency Response

AM [MW]

Refer to the back panel of the unit. Refer to the back panel of the unit. 6.2 kg

273 x 321x 359 mm

40 - 20000 Hz

75 dB

75 dB

87.5 - 108.0 MHz

10.7 MHz 60/55 dB

50 - 10000 Hz

Tuning Range	522 - 1620 kHz or 520 - 1720 kHz
Intermediate Frequency	450 kHz
Signal to Noise Ratio	30 dB
Frequency Response	140 - 1800 Hz
[AMP]MPLIFIER(LH-W96’s)
Output Power	100W +100W+150W [LM-U1560+LMS-U1560W(SUB WOOFER)]
	100W+100W [LM-U1060]
	50W +50W [LM-U560]
	30W + 30W [LM-U360]
T.H.D	0.5%
Frequency Response	40 - 20000 Hz
Signal-to-noise ratio	75 dB
[TAPE]
Tape Speed	4.75cm/sec
Wow Flutter	0.25% (MTT -111, JIS-WTD)
F.F/REW Time	120sec (C-60)
Frequency Response	250 - 8000Hz
Signal to Noise Ratio	43dB
Channel Separation	50dB(P/B)/45dB(R/P)
Erase Ratio	55dB (MTT-5513)
[SPEAKERS]
MODEL	LMS-U1560	LMS-U1560W	LMS-U560	LMS-U360
	LMS-U1060	(SUB WOOFER)
Type	2way 2speaker	1way 1speaker	2way 2speaker	2way 2speaker
Impedance	4Ω	3Ω	4Ω	4Ω
Frequency Response	50-20000Hz	50-15000Hz	55-20000Hz	55-20000Hz
Sound Pressure Level	85dB/W (1m)	84dB/W (1m)	86dB/W (1m)	86dB/W (1m)
Rated Input Power	100W	180W	50W	30W
Max. Input Power	200W	360W	100W	60W
Net Dimensions (W x H x D)	229X224X286mm	273x325x384mm	229X224X286mm	229X224X286mm
Net Weight	3.8kg	6kg	3.9kg	3.8kg

- 1-5 -

- 1-6 -

SECTION 2. ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE(AUDIO PART)

■ MICOM PART CHECK I

P7904 6PIN P-SENS check

NO

Refer to SMPS

Troubleshooting

YES

IC101 KIA7042?

NO

Check if IC101 KIA7042

YES

input is over 5V

NO

NO

YES

IC101 KIA7042

relevant parts check

IC100 78KO/KF2 1 PIN

Check if IC101 KIA7042

Power Check

input is over 4.3V

relevant parts

YES

YES

replacement

normal

normal

- 2-1 -

■ MICOM PART CHECK II

P7904 5PIN 5.6V check

NO

YES

D101 1SR35 both terminal power check

NO

YES

Q101 EMITTER 5V check and COLLECTO

YES

IC 103 8PIN IC 100 19,20,59 PIN 5V check

YES

X101:32.768KHz X100:9.8304MHz operation status check

YES

normal

Refer to SMPS

Troubleshooting

Output 5V operation check

D101 1SR35

YES

relevant parts check

YES

normal

Q102 BASE PIN

0.6V HIGH check

NO

YES

Q102 COLLECTOR

0.6V LOW check

YES

relevant parts check

YES

normal

NO	relevant parts
	replacement

Check if IC101 KIA7042 output power is over 4.3V

YES

NO

relevant parts check

YES

normal

relevant parts replacement

relevant parts replacement

- 2-2 -

■ IC103 KS4CD21CS CHECK

IC100 78KOKF2 22,24

PIN Check

YES

22 PIN DATA

NO

MICOM power 5V check

NO

Refer to MICOM

Troubleshooting

YES

YES

relevant parts check

NO

YES

relevant parts

replacement

normal

normal

■ FLD DISPLAY CHECK

P7904 1,2,3 power check

				NO
	YES						Refer to SMPS
							Troubleshooting

F1+, F2 both terminal: 5V and above VKK: power is over 26V

YES

P7302 connection status			NO
check and power check
F+,F2both termainal: 5V or
above VKK:26V or above
power check
YES
IC301 PT6324 Power check
50 PIN VKK:-26V 9, 51
PIN +5V
YES

P7302 assembly check

YES

Each PIN power check
		NO
YES				relevant parts
				replacement
normal

- 2-3 -

NO

YES

IC100 IC301 DATA Communication check PIN PIN (ST8)75 PIN 3PIN(STB) (DO) 76 PIN 2PIN(DO) (DI) 77 PIN 4PIN(DI)

(CLK)78 PIN 1PIN(CLK)

NO

YES

FLT light on

YES

normal

If 5V defective D321 SR35 input and output power check

YES

relevant parts check

NO

YES

normal

IC100

(STB)75 PIN (STB) (DO) 77 PIN 4PIN(DO) (CLK) 78 PIN 1PIN(CLK) Data output check

YES

76 PIN DATA input check

YES

relevant parts check

NO

YES

normal

relevant parts replacement

relevant parts replacement

- 2-4 -

■ PWM ALTERATION PART CHECK

P7905 9PIN 3.3V check

YES

IC604 PS9829 VDD PIN Power check (3.10.22.29.39.47.56.65.72. 87. 94)

YES

X601 12.288MHz operation check

YES

IC604 PS9829

86 PIN CLK input check

YES

IC100 78KOKF2 21 PWM_CLK 22 PWM_DATA 23 PWM_REST output check

YES

IC604 PS9829 DATA input check

78 PIN DATA

79 PIN CLK

96 PIN REST

YES

NO

NO

NO

NO

NO

Refer to SMPS

Troubleshooting

relevant parts check X604 12.288MHz

NO

YES

normal

R668(470Ω) output check

NO

YES

normal

LINE resistance check

DATA:R671 CLK:R670

RST:R665

NO

YES

normal

CD ASS`Y PS9829 communication status check(P7403)

YES NO

PWM MODULATOR output				IC604 PS9829 DATA input check
check
				YES				NO
FL:75(+)74(-)FR:71(+)70(-)
SW:68(+)67(-)
				normal
			NO
YES
				IC604 PS9829 parts check
normal

relevant parts replacement

relevant parts replacement

relevant parts replacement

Refer to CD Troubleshooting

Check each line resistance check

- 2-5 -

■ POWER AMP PART CHECK

P7905 3 PIN+12 13.14.15

PIN [ LM-U1560 : 32V/LM-U1060 : 32V/LM-U560 : 22V/LM-U360 : 16V ]

		NO
YES					Refer to SMPS
					Troubleshooting

Each IC700,701 34, 29, 26, 21 PIN input power check

YES

Each IC700, 701 1, 36.17, 18, 19 PIN +12V input power check

						Each LINE resistance output
			NO			power check
YES						IC700:R702, 701, 726, 727,
						724
						IC701:R730, 729, 750 ,753,
						752(Only LM-U1560)
PWM MODULATOR input
power check Each IC
4.6.14.16 PIN
YES
POWER IC 700.701.702.703
34.29.27.20 PIN output
check

YES

		NO
Output LINE COIL check					relevant parts
					replacement

YES

normal

- 2-6 -

■ AUX FUNCTION

Check whether JK800 contacts or not

YES

IC200

(BU4052)4,11PI

N input waveform check

NO

YES

IC200 (BU4052)3,13PIN output waveform check

YES

IC801 (MC4580) 3, 5 PIN input waveform check

NO

YES

IC801(MC4580) Pins 1, 7 output check

YES

IC603(CS5340) Pins10, 12 input check

YES NO

normal

IC200 (BU4052)16PINVDD, 8PIN VSS power check

YES		NO

relevant parts replacement

IC801 (MC4580)4PIN VSS,8PIN VDD power check

YES		NO

relevant parts replacement

IC603 Pin4 SDout check

YES NO

Relevant Part repplacement

µ-COM (IC100) 3, 6PIN Communication check

Refer to SMPS

Troubleshooting

IC603 Pins2, 7, 8 check

- 2-7 -

■ TUNER FUNCTION CHECK

Tuner module (TUN800) operation check

YES			NO	TUNER MODUEL power
				check (2PIN 9Vcheck)

IC200(BU4052)1,

12PIN input waveform check

YES

IC200 (BU4052)3,13PIN output waveform check IC601(BU4052)2,15PIN input waveform check

			NO	IC200 (BU4052)16PIN-	YES
YES
				VDD,8PIN VSS power check		relevant parts replacement

IC801 (MC4580)2,6PIN input waveform check.

YES			NO	IC801(MC4580)4PIN	YES
				VSS,8PIN VDD power check		relevant parts replacement

IC801(MC4580) Pins 1, 7 input check

YES

IC603(CS95340) Pins10, 12 input check

■ TAPE FUNCTION CHECK

TAPE PCB ASS`Y

YES

IC200(BU4052)2,1

5PIN input waveform check

			NO	IC200 (BU4052)16PIN-	YES
YES
				VDD,8PIN VSS power check		relevant parts replacement

IC200 (BU4052)3,13PIN output check IC601(BU4052) 2,15PIN input waveform check

YES

IC801 (MC4580)2,6PIN input check

			NO	IC200 (BU4052)16PIN-	YES
YES
				VDD,8PIN VSS power check		relevant parts replacement

IC801(MC4580) Pins 1, 7 input check

YES

IC603(CS95340) Pins10, 12 input check

- 2-8 -

■ TAPE PLAY PART CHECK

P2707:4 PIN 12V

			NO
YES				Refer to SMPS
				Troubleshooting
IC201 (HA12237)16 PIN 12V
input waveform check

YES

IC201:5.26 PIN

Signal Output check

		NO
			DECK HEAD input check			NO
							HEAD WIRE or
			YES
YES							Mecha replacement
			DECK HEAD input IC201

32.39PIN check

YES

IC20114 PIN MUTE				relevant parts check			NO
operation check				YES				relevant parts
								replacement
				normal
			NO
YES				IC202 10 PIN HIGH operation
				check
				YES
				relevant parts check
							NO
				YES				relevant parts
								replacement
normal				normal

- 2-9 -

■ TAPE REC PART CHECK

IC604 PS9829 #49,#52 PWM NO output check

YES

NO

P7207 #2.#4 output check

YES

NO

P2707 #5.#7 input check

YES

IC203 MC4580 #1,#7 check

NO

YES

IC201 7.24 PIN REC input check

YES

IC201 10.21 PIN output check

YES

L203 2.3 PIN oscillation check

YES

P2203 5.3 PIN input check

8 PIN ERASE input check

NO

YES

Refer to PWM modulation part

Q601 Collector waveform check

Board to Board cantact check

IC203 8 PIN +12V check

NO

YES

relevant parts check

NO

YES

normal

Q205(D1304)

BASE HIGH check

NO

YES

normal

normal

Refer to SMPS

Troubleshooting

relevant parts replacement

IC202 4 PIN HIGH operation check

YES

relevant parts replacement

- 2-10 -

■ SMPS POWER CIRCUIT

*MAIN PART

Check the fuse F901

YES

Check the DC V of C905. If DC V is over 400V

YES

Chcek the DC V Of C909, C903,C921 If DC V is in 14~19V and it is steady.

YES

Check the DC V Of C981,C945. If DC V is 6.1V

YES

Chcek the DC VOf C950,C951 If DC V is in 35V,-35V

YES

OK

NO

Replace the fuse

NO	Check BD901, LF901,902

NO			Check IC901 ,902		NO			Replace IC 901,902

YES

Check short of P9701,P9702 line

NO

Check short of P9702 line

NO

Check short of P9701 line

- 2-11 -

*P-SENS PART (OPTIONAL PART)

Check the PIN6 OF P9702		NO			Check power circuit Trouble
If DC V is over 5.6V					shooting

YES

OK

*VKK PART

Check the PIN3 OF P9702		NO			Check power circuit
If DC V is over -28V ±2					Trouble shooting

YES

OK

- 2-12 -

INTERNAL BLOCK DIAGRAM of ICs

• UTC MC4580

PIN CONFIGURATION

TEST CIRCUIT

- 2-13 -