LG LMSU-1050, LMU-1050-A Service manual

3CD CHANGER
DVD KARAOKE SYSTEM

SERVICE MANUAL

MODEL: LM-U1050A,LMS-U1050

SERVICE MANUAL MODEL: LM-U1050A,LMS-U1050

- 1-1 -

[CONTENTS]

❍ SECTION 1. GENERAL

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

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

• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

❍ SECTION 2. ELECTRICAL SECTION

• TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

• AUDIO PART TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

• 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

- 1-2 -

❏ 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.

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 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

SECTION 1. GENERAL

- 1-3 -

• 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.

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

- 1-4 -

❏ 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 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 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 -

❏ SPECIFICATIONS

NOTE : Specification are subject to change without notice in the course of product improvement.

- 1-6 -

- 2-1 -

VKK CHECK

P-SENS PART CHECK

CN701 3PIN DC -33V check

IC301 51PIN voltage check

SMPS Assy CN904 ➝ 5PIN 5V operation check

MAIN PCB CN701 5PIN 5V

MAIN PCB CN301 4PN 5V check

Refer to SMPS Troubleshooting

Refer to SMPS Troubleshooting

CN701 contact condition check

MAIN PCB PATTERN disconnection check

❏ TROUBLESHOOTING GUIDE

YES

YES

NO

NO

FRONT PN301 4PIN 5V check

FRONT IC304 operation status checck

u-COM 26PIN 5V check

YES

YES

YES

YES

YES

YES

NO

NO

Input voltage 4V or higer, output voltage

2.1V or higer operation check

IC304 KIA7042 replacement

SECTION 2. ELECTRICAL

- 2-2 -

Muting circuit Troublrshooting (MUTE condition)

Q752(A102) Base “HIGH”

Q604, Q605(D1302) BASE “HIGH” check

c-COM operation status check

Replace each related TR

Q603(A102) operation status check

Replace when Q603(A102) is defective

c-COM 2PIN(A-MUTE) LINE check

CN942/CN701 connection status
check

MUTE

YES

YES

YES

YES

NO

NO

NO

Unfelt voice

Input check (AUX ➝ 9.36 TUNER ➝ 6/39 TAPE ➝ 7/38CD ➝ 8/37PIN)

Check input and operation status for each function

YES

NO

IC601 20/25PIN output check

Refer to IC401(NJW1190) IC specification

YES

NO

IC601 input check (22/23PIN)

c-COM check and (CLK/DATA check)

YES

NO

IC601 output check (24PIN)

NORMAL

Check IC401 24PIN cover 8V and power circuit

YES

NO

Power operation staus check

R634 180(9.1)V check

YES

YES

NO

- 2-3 -

Specific FUNCTION MODE unfelt voice

TAPE

IC202 9PIN (PB MUTE) operation check

c-COM 301 3.4PIN CLK/DATA operation check

DECK HEAD WIRE connection status check

Refer to IC201 Troubleshooting

IC201 input check (HAED input) “A” DECK 32,39 “B” DECK 34,37

YES

YES

NO

IC202 14PIN HIGH operation check

Q212(A102) BASE LOW check

Q201.202(GATE) HIGH operation check

NO

IC201 output check (5, 26PIN)

IC401 7, 38 signal input check

YES

NO

Replace IC202

YES

NO

Q212(A101) EMITTER 5V check

Q213(C103 COLLECTOP LOW) operation check

Replace Q213(C103)

YES

NO

YES

Q201,202 (DRAIN) GND check

YES

Replace defective parts

YES

Q212(A102) COLLECTOR 5V operation check

YES

Replace defective parts

YES

NO

A

A

- 2-4 -

AUX

JK601 signal input check

IC401 9,36PIN signal input check

YES

YES

MIC

IC401 1PIN input check

Refer to IC404 Toubleshooting

YES

YES

TUNER

Refer to TUNERMODULE

IC401 6,39PIN signal input check

YES

YES

CD

Check Cn601 1,3PIN signal anad Refer to CD Troubleshooting

IC601 8,3PIN signal input check

YES

YES

MAIN PCB PATTERN check

NO

B

- 2-5 -

IC301 Troubleshooting

MIC PCB

IC406 6PIN power check and 2PIN input check

YES

MIC input pattern disconnection check and
after MIC insertion

NO

IC406 7PIN output check

YES

MIC MUTE operation status check

NO

PN401 3PIN output check

YES

NORMAL

YES

IC406 7PIN output check

NO

Replace IC406

NO

Check PN401 connection status
and IC301 20PIN status check

NO

JK401 input check

Q302 collector HIGH operation
check

Q302 (Replace C102)

IC301 17,46,72,90 power impression check

SMPS power 5V check

YES

NO

PN301 20PIN 5V impression chck

PN301 4PIN 5V P-SENS terminal check

YES

NO

X301 ossillates or not?

Replace X301

YES

NO

When IC301 11PIN power insert High ➝ LOW ➝ High

Replace IC301

Reset circuit check

YES

NO

Q302(C102M) operation staus check

NORMAL

YES

YES

NO

B

- 2-6 -

IC401 (NJW1190) Troubleshooting

IC401 24PIN power impression check

Refer to SMPS power check

YES

NO

IC401 22,23 Pulse waveform check (VOL UP,DOWN check while rotating VOL UP, DOWN

IC401 20,25 PIN waveform output check

IC301 10,8PIN check

IC401 7,37PIN(TAPE) input waveform check

YES

YES

YES

YES

NO

Replace IC601

NO

IC401 6,39(TUNER) PIN input waveform check

TAPE Troubleshooting

NO

IC401 8,37(CD) PIN input waveform check

TUNER module replacement

NO

YES

NO

IC401 9, 36(AUXO input waveform check

CD Troubleshooting

Nomal

Replace IC401

NO

MICOM(10,8) - IC601(21,22) PATTERN check

YES

IC301 Troubleshooting

NO

IC302, 202 (BU2090) Troubleshooting

IC301, 201 16PIN power impression check

SMPS power check

YES

NO

IC302,202 95,2,3PIN CLK data check

CONTROL function check

IC301 95,34,4PIN data check(When switching CD, TAPE FUNCTION)

NORMAL

YES

YES

NO

Replace IC302, 202

NO

Pattern check between IC301 and IC501

YES

Refer to IC301 Troubleshooting

NO

- 2-7 -

AMP MODULE Troubleshooting

PN301, PN702 assembly status check

1. PN301(7,8), PN702(13,14) PWM DATA.CLK operation status check, PN301
PWm/CS534012PIN 5152.514214 RESET 14 check

2. PN702:13PWM_SDA, 14PWM_SCL 1.5152.5142/RESET check

YES

NO

YES

NO

PN 7PIN 3.3V check power check

12.288MHz oscillation check

11, 27, 46PIN 3.3V check

YES

YES

YES

YES

YES

SMPS power check

CS5340 2PIN MCLK/PS9813 48CLK_IN

Replace when 12.288 is defective

NO

IC702 41, 42, 43, 44 operation status check

SMPS power check

NO

IC703 power cehck

IC703 5,15PIN RESET check

NORMAL

SMPS 36V power check

NO

IC301 79,81 PN301 12,14PIn check

NO

Play check

IC201 16PIN VCC power impression

IC201 5, 26PIN Signal Output check

IC201 14PIN Muting circuit check

Refer to SMPS power cehck

Replace IC201

Replace Deck Mecha

Deck Mecha operation performance check

YES

YES

YES

NO

NO

NO

- 2-8 -

Rec check (Q252, Q202 ON :R273, R223 High)

IC401 11,34 OUT check

IC401 each input 6, 39. TAPE. 7, 38. CD 8,38 AUX

9.36PIN signal input check

IC201 7,24PIN input check

IC201 10,21PIN output check

REC input check

Input LINE check

YES

YES

YES

NO

NO

L203 2,3PIN oscillation check

After REC output check, Replace defective IC

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

IC202 14PIN operation status check

IC202 4PIN operation check

Q205 Base 0.6V impression check

YES

Q213, 212 operation status check

YES

DECK replacement

YES

NO

Refer to power check

Q204 Collector Low

IC202 Troubleshooting check

Q203 replacement

Q204 replacement

NORMAL

L203 replacement

- 2-9 -

Dubbing check (“NORMAL or REC”//“HIGH”)

IC401 11,34 OUT check

IC401 each input TUNER 6, 39 TAPE 7, 38 CD 8, 38 AUX
9, 36 PIN signal input check

IC201 7, 24PIN input check

IC201 10,21PIN output check

REC input check

Input LINE check

YES

YES

YES

- 2-10 -

❏ INTERNAL BLOCK DIAGRAM of ICs

• TAS5142

BLOCK DIAGRAM

System
Mircrocontroller

/OTW (Over Temperature Warning)

/SD (H-Bridge is in shutdown)

VALID_AB

/RESET_AB

PWM_A

PWM_B

2-Channel
H-BRIDGE
BTL Model

VALID_CD

PWM_C

PWM_D

M1

M2

PVDD(0-31V)

GND

GV DD(12V) & VDD(12V)

SYTEM
POWER

Hardwire
over­curentlimit

PVDD
Power supply
Decoupling

GVDD, VDD,
& VREG
power supply
Decoupling

31V

12V

Bootstrap

4 ohm

4 ohm

L-C Output
Filter for
each 1/2
Bridge

2nd Order
L-C output
Filter for
each 1/2
Bridge

OUT_A

BST_A

BST_B

OUT_B

OUT_C

OUT_D

BST_C

BST_D

Bootstrap
Caps

H-Bridge2

/SD

/OTW

Output

H-Bridge1

PVDD_A, B, C, D

GND_A, B, C, D

GVDD_A, B, C, D

VREG

AGND

OC_ADJ

Left

Channel

Output

Right

Channel

Output

TAS50XX

Hardwire
Mode

4

4

4

- 2-11 -

• HA12237F

BLOCK DIAGRAM

- 2-12 -

• CS5340

BLOCK DIAGRAM

• NJW1190

BLOCK DIAGRAM

- 2-13 -

PIN FUNCTION (QFP48-P1)

• TAS5152

SYSTEM BLOCK DIAGRAM

- 2-14 -

- 2-15 -

FUNCTIONAL BLOCK DIAGRAM

• PS9813

BLOCK DIAGRAM

• Pin Assignment

PWM_CH2_M

CVDD2

DVSS3

PWM_LOL_MMSDIN

MBCK

PLL_AVSS

PLL_AVDD

MLRCK

NRESET

MIC_BCK

SLRCK

SSDIN

SBCK

EPD_ENA

MIC_LRCK

2

1

2

2

2

3

1

9

2

0

1

6

1

7

1

8

1

4

1

5

8

9

1

0

1

1

1

2

1

3

6

7

4

5

46

30

31

32

33

34

35

36

37

28

29

3

38

39

40

41

42

43

44

45

PWM_HP_L

PWM_LOR_M

DVDD2

DVDD1

PWM_CH1_M

DVSS2

PWM_CH2_P

PWM_CH3_P

PWM_CH3_M

PWM_LOR_P

PWM_LOL_P

OVERLOAD

PLL_DVDD

TEST_MODE2

TEST_MODE1

SCL

SA

CLK_IN

DVSS1

MCLK

SDA

27

26

48

47

2

1

MIC_SDIN

2

4

PWM_CH1_P

25

PS9813

PLL_DVSS

PLL_EXT_LPF

CVDD1

VSS

PWM_HP_R

PLL_AGS

N.C.

DVDD3

VSS

- 2-16 -

- 2-17 -

Pin Descriptions

- 2-18 -

- 2-19 -

• OTi-6888 (IC805)

BLOCK DIAGRAM

• AM5810 (IC802)

BLOCK DIAGRAM

Pin configuration

- 2-20 -

- 2-21 -

Pin Description

Application

- 2-22 -

- 2-23 -

• OTi-6888

PIN CONFIGUARTION

NC

GPIOB[0]

GPIOB[2]

LQFP-48

1

2

3

4

5

6

7

8

9

10

11

12

36

35

34

33

32

31

30

29

28

27

26

25

24

37

38

39

40

41

42

43

44

45

46

47

48

23

22

21

20

19

18

17

16

15

14

13

sda

scl

NC

vdd

xtal2

xtal1

gnd

reset_b

NC

GPIOA[7]

GPIOA[6]

NC

NC

NC

gnd

vdd

LED1_out

NC

GPIOA[5]

GPIOA[4]

NC

GPIOA[0]

GPIOA[1]

NC

NC

NC

NC

gnd

vdd

NC

GPIOA[2]

GPIOA[3]

NC

GPIOB[3]

GPIOB[1]

ext_int5

gnd

vdd

NC

SID

REQ

SIC

NC

DMNS_IO

DPLS_IO

- 2-24 -

- 2-25 -

PIN DESCRIPTION

OTi-6888 has two different kinds of package, 48-pin and 64-pin. OTi-6888 with 48-pin pack­age provides fundamental USB host function, however, it can provide external ROM func­tions if you choose 64-pin package.

Note: OTi-6888 with 48-pin package does not external ROM function.

Pin No. Pin Name Attribute Description

1 GPIOA[7] I/O GPIO
2 GPIOA[6] I/O GPIO
3 NC NC
4 NC NC
5 NC NC
6 NC NC
7 gnd I gnd
8 vdd I vdd
9 LED1_out O Status indication
10 NC NC
11 GPIOA[5] I/O GPIO
12 GPIOA[4] I/O GPIO
13 GPIOA[3] I/O GPIO
14 GPIOA[2] I/O GPIO
15 NC NC
16 NC NC
17 NC NC
18 gnd I gnd
19 vdd I vdd
20 NC NC
21 NC NC
22 NC NC
23 GPIOA[1] I/O GPIO
24 GPIOA[0] I/O GPIO
25 NC O NC
26 reset_b I Power on reset input , low active
27 gnd I gnd
28 xtal1 I Crystal input
29 xtal2 O Crystal output
30 vdd I vdd
31 NC NC
32 scl O The clock pin for I2C
33 sda I/O The data pin for I2C
34 GPIOB[0] I/O GPIO
35 NC NC
36 GPIOB[2] I/O GPIO
37 NC NC
38 SIC O The clock pin for bit stream
39 REQ I The request pin for bit stream
40 SID O The data pin for bit stream
41 NC O NC
42 vdd I vdd
43 DPLS_IO I/O USB D+
44 DMNS_IO I/O USB D­45 gnd I gnd
46 GPIOB[1] I/O GPIO
47 ext_int5 I External interrupt input
48 GPIOB[3] I/O GPIO

Pin No. Pin Name Attribute Description

1 ex_romdata [5 ] I ex_romdata_pad [5 ]
2 ex_romdata [4 ] I ex_romdata_pad [4 ]
3 GPIOA [7 ] I/O GPIOA_pad [7 ]
4 GPIOA [6 ] I/O GPIOA_pad [6 ]
5 gnd I gnd
6 vdd I vdd
7 LED1_out O LED1_out_pad
8 GPIOA [5 ] I/O GPIOA_pad [5 ]
9 GPIOA [4 ] I/O GPIOA_pad [4 ]
10 ex_romaddr [12 ] O ex_romaddr_pad [12 ]
11 ex_romaddr [11 ] O ex_romaddr_pad [11 ]
12 ex_romaddr [10 ] O ex_romaddr_pad [10 ]
13 ex_romaddr [9 ] O ex_romaddr_pad [9 ]
14 gnd I gnd
15 vdd I vdd
16 ex_romaddr [8 ] I ex_romaddr_pad [8 ]
17 ex_romdata [3 ] I ex_romdata_pad [3 ]
18 ex_romdata [2 ] I ex_romdata_pad [2 ]
19 GPIOB [6 ] I/O GPIOB_pad [6 ]
20 GPIOB [4 ] I/O GPIOB_pad [4 ]
21 GPIOA [3 ] I/O GPIOA_pad [3 ]
22 GPIOA [2 ] I/O GPIOA_pad [2 ]
23 gnd I gnd
24 vdd I vdd
25 GPIOA [1 ] I/O GPIOA_pad [1 ]
26 GPIOA [0 ] I/O GPIOA_pad [0 ]
27 ex_romaddr [7 ] O ex_romaddr_pad [7 ]
28 gnd I gnd
29 vdd I vdd
30 ex_romaddr [6 ] O ex_romaddr_pad [6 ]
31 ex_romaddr [5 ] O ex_romaddr_pad [5 ]
32 ex_romaddr [4 ] O ex_romaddr_pad [4 ]
33 rxdi1 I rxd1i_pad
34 ex_romaddr [3 ] O ex_romaddr_pad [3 ]
35 ex_romaddr [2 ] O ex_romaddr_pad [2 ]
36 ex_romdata [1 ] O ex_romdata_pad [1 ]
37 ex_romdata [0 ] O ex_romdata_pad [0 ]
38 mode0 I mode0_pad
39 reset_b I reset_b_pad
40 gnd I gnd
41 xtal1 I xtal1_pad
42 xtal2 O xtal2_pad
43 vdd I vdd
44 scl O scl_pad
45 sda I/O sda_pad
46 gnd I gnd
47 ex_romaddr [1 ] O ex_romaddr_pad [1 ]
48 ex_romaddr [0 ] O ex_romaddr_pad [0 ]
49 txd1 O txd1_pad
50 ex_romdata [7 ] I ex_romdata_pad [7 ]
51 ex_romdata [6 ] I ex_romdata_pad [6 ]
52 SIC O SIC_pad
53 REQ I REQ_pad
54 SID O SID_pad
55 vdd I vdd
56 DPLS_IO I/O DPLS_IO_pad
57 DMNS_IO I/O DMNS_IO_pad
58 gnd I gnd
59 GPIOB [1 ] I/O GPIOB_pad [1 ]
60 host_dev_sel I host_dev_sel_pad
61 gnd I gnd
62 ex_romaddr [15 ] O ex_romaddr_pad [15 ]
63 ex_romaddr [14 ] O ex_romaddr_pad [14 ]
64 ex_romaddr [13 ] O ex_romaddr_pad [13 ]

Note : OTi-6888 with 64-pin package with External ROM functions.

- 2-26 -

❏ BLOCK DIAGRAM

2-27 2-28

2-29 2-30

❏ SCHEMATIC DIAGRAMS

• MAIN SCHEMATIC DIAGRAM

2-31 2-32

• FRONT SCHEMATIC DIAGRAM

2-33 2-34

• DECK SCHEMATIC DIAGRAM

2-35 2-36

• POWER SCHEMATIC DIAGRAM

2-37 2-38

• CDP SCHEMATIC DIAGRAM

2-39 2-40

• AMP SCHEMATIC DIAGRAM

2-41 2-42

• MIC SCHEMATIC DIAGRAM

2-43 2-44

❏ WIRING DIAGRAM

2-45 2-46

❏ PRINTED CIRCUIT DIAGRAMS

• MAIN P.C. BOARD (SOLDER SIDE)

2-47 2-48

• MAIN P.C. BOARD (COMPONENT SIDE)

2-49 2-50

• FRONT P.C. BOARD(COMPONENT SIDE)

2-51 2-52

• FRONT P.C. BOARD(SOLDER SIDE)

2-53 2-54

• CDP P.C. BOARD (COMPONENT SIDE)

2-55 2-56

• CDP P.C. BOARD (SOLDER SIDE)

2-57 2-58

• AMP P.C. BOARD (SOLDER SIDE)

2-59 2-60

• AMP P.C. BOARD (COMPONENT SIDE)

2-61 2-62

• SMPS P.C. BOARD (SOLDER SIDE) • SMPS P.C. BOARD (COMPONENT SIDE)

3-1 3-2

A43

A26

279

267

268

270

271

264

A50

A49

454

A00

272

257

258

259

261

260

262

263

251

250

265

281

A51

269

266

256

Caution point
A43: Front + MIC + USB + Headphone
array assembly pcb

301

450

303

A48

A46

305

A47

253

252

355

A41

*OPTION

MD ASSY

302

SECTION 3. EXPLODED VIEWS

❏ CABINET AND MAIN FRAME SECTION

3-3 3-4

025

504

023

015

022

019

037

021

020

505

018

017

016

506

006

A01

402

008

007

401

001

002

003

502

507

501

502

402

401

009

401

009

011

013

A02

026

403

406

• TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK)

LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION

A00 6720AG0008A DECK,AUDIO CWN42FR04 TOKYO PIGEON L-DOUBL

A01 6768R-UP04A DECK MECHANISM PARTS 50-093-41285 PIGEON UNIT

A02 6768R-EP05A DECK MECHANISM PARTS 50-093-41234 PIGEON HEAD ASSY

001 6768R-BP03D DECK MECHANISM PARTS 02-083-4254 PIGEON BELT/FELT C

002 6768R-BP03E DECK MECHANISM PARTS 02-083-4256 PIGEON BELT/FELT C

003 6768R-PP03A DECK MECHANISM PARTS 33-160-4309 PIGEON PRESS CASSE

006 6768R-QP04A DECK MECHANISM PARTS 50-093-41299 PIGEON MOTOR(ASSY

007 6768R-GP03B DECK MECHANISM PARTS 50-222-4578 PIGEON GEAR IDLER

008 6768R-SP01F DECK MECHANISM PARTS 01-082-4598 PIGEON SPRING CWL4

009 6768R-MP01C DECK MECHANISM PARTS 50-219-4014 PIGEON MOLD CWL44

011 6768R-SP01A DECK MECHANISM PARTS 01-081-4601 PIGEON SPRING CWL4

013 6768R-SP03A DECK MECHANISM PARTS 01-082-4686 PIGEON SPRING CRM4

015 6768R-AP01A DECK MECHANISM PARTS 50-268-3016 PIGEON ARM CWL44

016 6768R-GP01H DECK MECHANISM PARTS 50-093-4503 PIGEON GEAR CRL442

017 6768R-AP01C DECK MECHANISM PARTS 50-239-4072 PIGEON ARM CWL44

018 6768R-GP01J DECK MECHANISM PARTS 50-222-4428 PIGEON GEAR CRL442

019 6768R-SP01P DECK MECHANISM PARTS 01-081-4678 PIGEON SPRING CRL4

020 6768R-BP01C DECK MECHANISM PARTS 02-083-4188 PIGEON BELT/FELT C

021 6768R-LP01C DECK MECHANISM PARTS 50-223-4429 PIGEON PULLEY/FLYW

022 6768R-VP03A DECK MECHANISM PARTS 50-093-4748 PIGEON SOLENOID AS

023 6768R-GP03A DECK MECHANISM PARTS 50-093-4810 PIGEON GEAR ASSY C

025 6768R-JP03B DECK MECHANISM PARTS 50-093-31009 PIGEON PULLEY/FLY

037 6768R-JP03A DECK MECHANISM PARTS 50-093-4674 PIGEON PULLEY/FLYW

401 6768R-CP01B DECK MECHANISM PARTS GSE20A2005 PIGEON SCREW CWL44

402 6768R-CP01A DECK MECHANISM PARTS GSE10A2003 PIGEON SCREW CWL44

403 6768R-CP01D DECK MECHANISM PARTS GSL10A1704 PIGEON SCREW CWL44

407 6768R-CP01H DECK MECHANISM PARTS GSL20A2005 PIGEON SCREW CWL44

408 6768R-CP01J DECK MECHANISM PARTS 03-300-4127 PIGEON SCREW CWL44

501 6768R-WP03A DECK MECHANISM PARTS GWN19S035040 PIGEON WASHER CRM

502 6768R-WP03B DECK MECHANISM PARTS 03-000-4532 PIGEON WASHER CRM4

504 6768R-WP01D DECK MECHANISM PARTS GWP21X045020 PIGEON WASHER CWL

505 6768R-WP01E DECK MECHANISM PARTS GWP12X030040S PIGEON WASHER CW

506 6768R-WP01H DECK MECHANISM PARTS GWP23X040020 PIGEON WASHER CWL

507 6768R-WP01F DECK MECHANISM PARTS GWN21X040040 PIGEON WASHER CWL

3-5 3-6

• TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK)

016

401

018

007

008

015

023

019

021

020

505

017

403

504

025

026

030

029

028

401

027

502

009

401

003

501

401

011

013

009

022

LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION

A00 6720AG0008A DECK,AUDIO CWM42FR47 TOKYO PIGEON L-DOUBL

003 6768R-PP03A DECK MECHANISM PARTS 33-160-4309 PIGEON PRESS CASSE

007 6768R-GP03B DECK MECHANISM PARTS 50-222-4578 PIGEON GEAR IDLER

008 6768R-SP01F DECK MECHANISM PARTS 01-082-4598 PIGEON SPRING CWL4

009 6768R-MP01C DECK MECHANISM PARTS 50-219-4014 PIGEON MOLD CWL44

011 6768R-SP01A DECK MECHANISM PARTS 01-081-4601 PIGEON SPRING CWL4

013 6768R-SP03A DECK MECHANISM PARTS 01-082-4686 PIGEON SPRING CRM4

015 6768R-AP01A DECK MECHANISM PARTS 50-268-3016 PIGEON ARM CWL44

016 6768R-GP01H DECK MECHANISM PARTS 50-093-4503 PIGEON GEAR CRL442

017 6768R-AP01C DECK MECHANISM PARTS 50-239-4072 PIGEON ARM CWL44

018 6768R-GP01J DECK MECHANISM PARTS 50-222-4428 PIGEON GEAR CRL442

019 6768R-SP01P DECK MECHANISM PARTS 01-081-4678 PIGEON SPRING CRL4

020 6768R-BP01C DECK MECHANISM PARTS 02-083-4188 PIGEON BELT/FELT C

021 6768R-LP01C DECK MECHANISM PARTS 50-223-4429 PIGEON PULLEY/FLYW

022 6768R-VP03A DECK MECHANISM PARTS 50-093-4748 PIGEON SOLENOID AS

023 6768R-GP03A DECK MECHANISM PARTS 50-093-4810 PIGEON GEAR ASSY C

025 6768R-JP03B DECK MECHANISM PARTS 50-093-31009 PIGEON PULLEY/FLY

026 6768R-SP01D DECK MECHANISM PARTS 01-080-4609 PIGEON SPRING CWL4

027 6768R-DP01A DECK MECHANISM PARTS 50-259-3342 PIGEON LEVER CWL44

028 6768R-RP01A DECK MECHANISM PARTS 22-027-41054 PIGEON ROLLER CWL

029 6768R-MP01A DECK MECHANISM PARTS 50-219-4033 PIGEON MOLD CWL44

030 6768R-EP03C DECK MECHANISM PARTS T21V0P PIGEON HEAD CWM42FF30

401 6768R-CP01B DECK MECHANISM PARTS GSE20A2005 PIGEON SCREW CWL44

403 6768R-CP01D DECK MECHANISM PARTS GSL10A1704 PIGEON SCREW CWL44

501 6768R-WP03A DECK MECHANISM PARTS GWN19S035040 PIGEON WASHER CRM

502 6768R-WP03B DECK MECHANISM PARTS 03-000-4532 PIGEON WASHER CRM4

504 6768R-WP01D DECK MECHANISM PARTS GWP21X045020 PIGEON WASHER CWL

505 6768R-WP01E DECK MECHANISM PARTS GWP12X030040S PIGEON WASHER CW

3-7 3-8

• CD MECHANISM

416

151

156

418

169

173

171

170

419

163

422

165

159

164

417

417

416

166

167

177

175

172

162

153

168

155

LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION

A26 4405R-E008B MECHANISM ASSEMBLY LM-U1050/U1350 MP3 CD PWB + H1

A30 3041RB0002C BASE ASSEMBLY PU(SPRING DAMPER)

A35 6717RCA001B PICK UP ASSEMBLY KSM-213VLCM SONY FRONT LOADING

151 3390RB0002A TRAY DISC(CDM-H1503)

153 4470RB0005A GEAR TRAY (CDM-H1503)

155 4681RBA001B MOTOR ASSEMBLY HOME TRAY (CDM-H1503) MABUCHI

156 6871RF9211A PWB(PCB) ASSEMBLY,FRONT 1503 T/D SENSOR

159 3390RB0001A TRAY LOADING(CDM-H1503)

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)

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

172 3040RB0005A BASE MAIN (CDM-H1503)

173 4510RB0001A LEVER S/W CLOSE

175 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

420 353S353F SCREW,DRAWING #NAME?

421 6756SBX001A CD MECHANISM PARTS SCREW 2.6X10X10XFZMY CDM-H813

422 353-028H SCREW #NAME?

- 4-1 -

❏ MODEL: LMS-U1050

859

860

865

858

861

856

855

862

857

850

LEFT

RIGHT

LEFT

RIGHT

851

854

853

863

852

SECTION 4. SPEAKER SECTION

- 4-2 -