LG LACM-9600-R, LACUA-96-R Service manual

MODELS : LAC-M9600R/LAC-UA96R

MODELS : LAC-M9600R/LAC-UA96RSERVICE MANUAL

P/NO : AFN31223641 SEPTEMBER, 2006

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL.

CAR CD/MP3/WMA RECEIVER

SERVICE MANUAL

PWR

MUTE

MIC

B.T MENU

XDSS/SRS

SRC

DISP

OPEN/TILT

USB

1-1

[CONTENTS]

SECTION 1. SUMMARY

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

ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

BLUETOOTH OPERATING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11

SECTION 2. ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . .2-1

INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-33

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-53

SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-55

PRINTED CIRCUIT BOARD DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-71

SECTION 3. EXPLODED VIEWS

CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

MECHANISM (PICK-UP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 3

SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

1-2

SECTION 1. SUMMARY

SERVICING PRECAUTIONS

1. Always disconnect the power source before:

1) Removing or reinstalling any component, circuit board, module or any other instrument assembly.

2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection.

3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an

explosion hazard.

2. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped.

3. Do not apply power to this instrument and or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

4. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.

1) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing, follow the printed or indicated service precautions and service materials.

2) The Components used in the unit have a specified conflammability and dielectric strength. When replacing any components, use components which have the same ratings. Components marked in the circuit diagram are important for safety or for the characteristics of the unit. Always replace with the exact components.

3) An insulation tube or tape is sometimes used and some components are raised above the printed writing board for safety. The internal wiring is sometimes clamped to prevent contact with heating components. Install them as they were.

4) After servicing always check that the removed screws, components and wiring have been installed correctly and that the portion around the service part has not been damaged. Further check the insulation between the blades of attachment plug and accessible conductive parts.

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 POINTWITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERTTHE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

1-4

SPECIFICATIONS

• GENERAL CD SELECTION

Output Power 60W x 4CH (Max.) Power Source DC 14.4 V Speaker impedance 4 Ω Ground System Negative Dimensions (W x H x D) 180 x 51 x 171 mm (Without Front Panel) Net Weight 2.0 kg

• CD SELECTION

Frequency Response 20 Hz-20 kHz S/N Ratio 93 dB Distortion 0.05 % Channel Separation (1kHz) 60 dB

• RADIO SELECTION

FM Frequency Range 87.5-107.9 or 87.5-108 MHz S/N Ratio .60 dB Distortion 0.3 % Usable Sensitivity .2 dBµ V AM (MW) Frequency Range 520-1720 or 522-1620 kHz S/N Ratio 55 dB Distortion 0.6 % Usable Sensitivity 24 dBµ V

• LINE-OUT SELECTION

Frequency Response 20 Hz-20 kHz S/N Ratio 100 dB Distortion 0.02 % Channel Separation (1kHz) 80 dB Max Output Level (1kHz) 5 V (1.2 KΩ)

• AUX SELECTION

Frequency Response 20 Hz-20 kHz S/N Ratio 90 dB Distortion 0.02 % Channel Separation (1kHz) 80 dB Max Input Level (1kHz) 1.4 V (35 KΩ)

• BLUETOOTH SELECTION

TX POWER 4 dBm Frequency Range 2400-2483.5 MHz Version Bluetooth 2.0 certified

• USB SELECTION

Version USB 1.1

1 No Power Checked the Fuse. F901

Checked the Back up Vdd, Gnd. CN901(3, 4) Checked the Micom Back Up Vdd. IC901(15, 14) Fig 1 Checked the Micom Ground. IC401(19, 20, 59) Checked the Reset. IC404, Q403, IC401(10) Fig 1 Checked the X-tal. X401, X402 Fig 1 Checked the ACC in. Q902, Q910, IC401(40), CN901(6) Checked the detachable switch. CN401(1), IC401(73) Checked the Key line. IC201(78, 79, 80),

See a System Error Correction.

2 Not available Remocon Checked the Remocon Sens Vdd. RMC201, R275

Checked the Remocon Sens line. IC201(18) 3 Not available to Volume control Checked the Encoder Volume. VOL201, IC201(30, 34) 4 Not available to Key Control Checked Tact switch. SW901 ~ SW919

Checked Key line. IC201(78, 79, 80) 5 No sound Checked the E-VR Vdd. IC601(29), IC901(10), Q911, Q912,

IC401(38) Checked the E-VR Ground. IC601(10) Checked the E-VR control. IC601(12, 13, 15), IC401(24, 25, 27) Fig 21 Checked the E-VR Signal in/out. IC601(3, 4, 5, 7, 40, 41, 42, 43, 44) Checked the E-VR Mute Control IC601(15), IC401(27) Checked the Power IC Vdd. IC801(7, 21) Checked the Power IC Ground. IC803(1, 2, 8, 13, 18, 24) Checked the Power IC Control. IC801(23, 26, 27), IC401(23, 39, 42) Fig 23 Checked the Power IC Signal in/out. IC801

(12, 13, 15, 16, 4, 6, 8, 10, 18, 20, 22) Checked the main connector. CN901(11, 12, 13, 14, 15, 16, 17, 18)

6 Not avaliable to SRS control Checked the SRS Chip VDD. IC651(24)

Checked the SRS Chip Ground . IC651(21) SRS Chip Mode Control. IC651(27, 28, 29), IC401(33, 34, 35) Checked the SRS Chip Signal in/out. IC651(42, 43, 31, 32, 33)

7 No Line out signal Checked the Line Out AMP Vdd. IC853, IC851(16), IC852(1)

Checked the Line Out AMP Ground. IC853, IC851(1,11), IC852(11,14) Checked the Line Out AMP Mute control. IC401(30,49), Q863, Q851, Q852, Q853,

Q854, Q151, Q859, Q860, Q861, Q862 Checked the Line Out AMP Signal in/out. IC851(5,7,12,20,3,9,13,19),

IC852(2,7,12,13), CN151, CN851

8 Hearing the Pop Noise Checked the Mute Control. IC801(23, 26, 27),

IC401(23, 24, 25, 27, 39, 42, 49, 55),

IC801(23, 26, 27), Q806, Q151, Q863" Checked the AF mute. TU101(14), IC401(57)

9 Not avaliable to Telephone Mute Checked the telephone mute control. CN901(7), Q903,Q904, IC401(43)

Checked the Mute Control. IC601(12, 13,15), IC801(23, 26, 27),

Q806, Q863, Q151

10 Not avaliable to ANT Control Checked the ANT control. CN901(10), IC901(12, 13), IC401(37) 11 Not avaliable to Remote control Checked the Remote control. CN901(9), Q907,Q906, IC401(44) 12 No output Beep sound. Checked the Beep Control. IC401(79), IC803(12, 16)

SYSTEM CONTROL

2-1

SECTION 2 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

• CHECK POINT

Check Point Curcuit Location No.

Remark

SymptomNo

2-2

1 No Display or Checked the Front Micom Vdd. IC901(7, 9),

Some Display is broken IC201(8, 23, 37, 56, 62, 67, 72, 81, 98,

112, 124, 134) Checked the Front Micom Ground. IC201(8, 23, 37, 56, 62, 67, 72, 81, 98,

112, 124, 134) Checked the Front Micom Reset. IC206, IC210(66) Checked the Front Micom OSC. X201 Checked the Main to Front data interface. IC410(74,75,76,77,78),

IC201(19,53,54,55,,66) Fig 2, 3 Checked the OLED Module Vdd. CN202(1, 2, 3, 4, 5), IC902, Q908, Q909 Checked the OLED Module control. CN202 Fig 26

(6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18) Checked the OLED Module Data . CN202(21 ~ 36) Checked the SRAM Vdd. IC205(11, 33) Checked the SRAM Control. IC205(6, 17, 38, 39, 40, 41) Checked the SRAM Data. IC205 Checked the FLASH Memory Vdd. IC204(9, 15, 36, 41) Checked the FLASH Memory Control. IC204(1, 2, 48, 50, 55, 56) Checked the FLASH Memory Data. IC204

2 No Key Lighting Checked the LCD Lighting VDD. IC901(4, 9), IC401(31), CN401(20)

Checked the LED. LD201 ~ LD215

3 Don't moved Level bar Checked the Level Meter control. IC601(3, 4), IC401(15) Fig 22 4 Not avaliable to Dimmer control Chekced the Dimmer control. CN901(8), D905, IC901(4, 9), IC401(41)

DISPLAY & LIGHTING

Check Point Curcuit Location No.

Remark

SymptomNo

1 Not available to Tuner Checked the Tuner Vdd. TU101(8, 22), Q911, Q912, IC901(10 ,11),

IC401(36, 38), Q401, Q402 Checked the Tuner Ground. TU101(2, 4, 12, 16) Checked the PLL data. TU101(20, 21), IC401(21, 22) Checked the RF signal in. TU101(1) Checked the mute control. TU101(14), Q102, 103, 104, IC401(29, 57) Checked the SD & SSTOP level. TU101(7, 11), IC401(56, 62)

2 Tuner no sound Checked the Tuner Signal out. TU101(17,18), IC601(42,43) 3 Not available to RDS Checked the RDS data. TU101(23, 24), IC401(1, 58)

TUNER FUNCTION

Check Point Curcuit Location No.

Remark

SymptomNo

2-3

1 No Loading/Unloading Checked the CD Vdd. IC371(4, 5, 1, 7), PN502 (8), IC510(19,

20, 59), PN502(1, 2), IC513 (5, 9, 10, 24,

25, 29), PN502 (6), IC512, IC506(19, 20,

27, 47, 58, 76, 77, 93) Checked the CD MICOM, DSP Reset. IC510(57), IC506(72) Checked the CD DSP X-tal. X503 Checked the Disc in/out switch. PN505(1,2), IC510(80) Fig 4, 6 Checked the Loading Motor Control. IC501(1, 2, 9. 10), IC401(35,36) Fig 5, 7 Checked the 8/12Cm sens switch. PN505(3,4), IC510(4)

12Cm "L"

Checked the chucking switch. SW1, IC510(6)

Chuck "L"

2 No Reading & Checked the Limit switch. PN507(3,4), IC510(68)

Limit "L"

"FILE CHECK" DISPLAY Checked the Motor DRV mute control. IC510(56), IC513(13)

Mute "L" Checked the LD Control. IC506(42), Q501 Checked the CD DSP Control. IC506(67,68,69,70,71)

Fig 14~ 17 Checked the focus control. IC506(25), IC513(17,18) Fig 8 Checked the focus error level out.(FE Mon)

IC506(29), R517 Fig 8 Checked the RF signal out check. IC506(41,16) Fig 9 Checked the spindle motor control. IC506(21), IC513(8,5) Fig 10 Checked the sled motor control. Q1,Q2, IC513(1,2,32,33)

Fig 11, 12

Checked the tracking control. IC506(24), IC513(19,20) Fig 13

3 No ejected the CD Checked the Eject key. SW201, IC201(55,78), IC401(77)

Checked the Loading Motor Control. IC510(2,3), IC513(12,14,15) Fig 4~7

4 CD no sound Checked the CD DSP signal out. IC506(73,74,75) Fig 20

Checked the DAC Vcc, Vcom. IC508(6, 10) Checked the DAC signal In/out IC508(1,2,3,7,8) Fig 20 Checked the DAC Mute. IC508(11), IC510(7) Checked the OP AMP VDD. IC301(8) Checked the OP AMP Signal in/out. IC301(1,2,3,5,6,7)

CD FUNCTION

Check Point Curcuit Location No.

Remark

SymptomNo

2-4

1 Only "NO USB" or Checked the USB Vdd. IC512(2), L507, L508, L509, R566

"USB CHECK" Display Checked the USB interface IC reset. IC511(57), IC510(37)

Checked the USB interface IC X-tal. X505 Checked the Flash memory CE. IC511(65) Checked the D+/D- Port. IC511(62, 63) Fig 18 Checked the USB indication Port. IC510(35), IC511(27) Checked the USB interface IC control. IC510(34),IC511(38)

2 FILE CHECK DISPLAY Checked the CD Vdd. PN502 (6), IC512,

IC506(19, 20, 27, 47, 58, 76, 77, 93) Checked the CD DSP Reset. IC506(72), IC510(57) Checked the CD DSP X-tal. X503 Checked the CD DSP Control. IC506 (67,68,69,70,71,72,73) Checked the USB data. IC511(22, 23), IC510(50, 51)

3 No USB sound Checked the USB Host Data out IC511(52,53,54), IC506(62,63,64)

Checked the CD DSP signal out. IC506(73,74,75) Fig 19 Checked the DAC Vcc, Vcom. IC508(6, 10) Checked the DAC signal In/out IC508(1,2,3,7,8) Fig 20 Checked the DAC Mute. IC508(11), IC510(7) Checked the OP AMP VDD. IC301(8) Checked the OP AMP Signal in/out. IC301(1,2,3,5,6,7)

USB FUNCTION

Check Point Curcuit Location No.

Remark

SymptomNo

1 No pairing Checked the BT module Vdd. IC202(41)

Checked the BT module RESET. IC202(40) Checked the BT module data interface. IC202(13,14), IC401(50, 51)

Fig 24, 25

2 No Sound Checked the CODEC Vdd. IC203(1,14)

Checked the CODEC Audio Data. IC203(3,4,5,6,7), IC202(15,16,18,19) Checked the MIC. CN205, IC203(17) Checked the OP AMP VDD. IC331(8) Checked the OP AMP Signal in/out. IC331(1,2,3,5,6,7)

BT FUNCTION

Check Point Curcuit Location No.

Remark

SymptomNo

2-5

• WAVEFORMS

• Fig 1(Initial connecting the Main Connector and supply of electric power)

CH1 X401 CH2 X402

CH3 IC401(10) CH4 Back-Up 5V L403

• Fig 2(Power ON and started the Front Micom Control data)

CH1 CN401(2) CH2 CN401(4) CH3 CN401(5)

CH4 CN401(6)

• Fig 3(Front Micom Control data)

CH1 CN401(2) CH2 CN401(4)

CH3 CN401(5)

CH4 CN401(6)

2-6

• Fig 4(Switch condiotion about Loading)

CH1 SW1, R5046 CH2 PN502(2)

CH3 PN507(3) CH4 PN505(4)

• Fig 5(Loading Motor Control)

CH1 IC501(3)

CH2 IC501( 2) CH3 PN506(1)

CH4 PN506(2)

• Fig 6(Switch condiotion about Unloading)

CH1 SW1, R5046

CH2 PN502(2) CH3 PN507(3)

CH4 PN505(4)

2-7

• Fig 7(Unloading Motor Control)

CH1 IC501(3)

CH2 IC501( 2) CH3 PN506(1)

CH4 PN506(2)

• Fig 8(Focus Control)

CH1 IC502(22) CH2 IC502(16)

CH3 IC502(15)

• Fig 9(RF Signal)

CH1 IC506(46)

CH2 IC506(49)

2-8

• Fig 10(Spindle Control)

CH1 PN507(2)

CH2 PN50791)

CH3 IC506(54) CH4 IC506(21)

• Fig 11(Sled Control)

CH1 IC510(63), Q1

CH2 IC510(64), Q2

• Fig 12(Sled Control)

CH1 PN501(4), A

CH2 PN501(3), B

CH3 PN501(1), NA CH4 PN501(2), NB

2-9

• Fig 13(Tracking Control)

CH1 PN504(2)

CH2 PN504(3) CH3 IC506(24)

CH4 R517, T106

• Fig 14(CD DSP Control data - Initial Play)

CH1 IC510(57)

CH2 IC510(71)

CH3 IC510(48)

• Fig 15(CD DSP Control data - Initial Play)

CH1 IC510(58)

CH3 IC510(70)

CH2 IC510(72)

2-10

• Fig 16(CD DSP Normal Play)

CH1 IC510(40) CH2 IC510(78)

CH3 IC510(77) CH4 IC510(76)

• Fig 17(CD DSP Normal Play)

CH1 IC510(40)

CH2 IC510(78) CH3 IC510(77)

CH4 IC510(76)

• Fig 18(Connecting the USB Device)

CH1 PN503(2)

CH2 PN503(3) CH3 CN401(16)

2-11

• Fig 19(The USB Device audio data interface)

CH1 IC506(62)

CH2 IC506(63) CH3 IC506(64)

• Fig 20(The DAC audio data interface)

CH1 IC508(1) CH2 IC508(3)

CH3 IC508(2)

• Fig 21(The E-VR control data)

CH1 IC601(12)

CH2 IC601(13)

2-12

• Fig 22(The E-VR Level Meter signal data, 1kHz)

CH1 IC601(14) SAIN

CH2 IC601(16) SAOUT

• Fig 23(The Power AMP control data)

CH1 IC801(23)

CH2 IC801(26)

• Fig 24(The BT not pairing Standby data)

CH1 IC401(50)

CH2 IC401(51) CH3 CN401(19)

CH4 CN401(17)

2-13

• Fig 25(The BT pairing data)

CH1 IC401(50)

CH2 IC401(51) CH3 CN401(19)

CH4 CN401(17)

• Fig 26(The OLED control data)

CH1 CN202(12)

CH2 CN202(16)

CH3 CN202(13)

CH4 CN202(15)

2-14

• ELECTRICAL TROUBLESHOOTING GUIDE

1. System Control Error correction Flow Chart.

Something wrong with the system control?

No power?

YES

Checked the Fuse?

Checked the Back up Vdd and Gnd?

Checked the Main Micom Back up Vdd?

Checked the Main Micom Back up Gnd?

Checked the Main Micom Reset?

Checked the Main Micom X-tal?

Checked the ACC in?

Checked the detachable switch?

Checked the Front Panel Data Interface?

Checked the Front Micom Back up Gnd?

Checked the Front Micom Reset?

Checked the Key Line?

Inside of CN902 F901

CN901(4, 3)

IC901(15, 14)

IC401(19, 20, 59)

IC404, Q403 IC401(10)

X401, X402

Q902, Q910, IC401(40), CN901(6)

CN401(1), IC401(73)

IC401(74, 75, 76, 77, 78)

IC402, 403

CN401(2, 3, 4, 5, 6)

IC201(8, 23, 37, 56, 62, 67, 72, 81, 98, 112, 124, 134)

IC201(66), IC206, CN201(3)

IC201(78, 79, 80)

2-15

Something wrong with the system control?

Not available to Remocon?

YES

Checked the Remocon Sens Vdd?

Checked the Remocon Sens line?

RMC201, R275

IC201(18)

Something wrong with the system control?

Not available to Volume control?

YES

Checked the Encoder Volume?

Checked the Volume IC?

VOL201, IC201(30, 34)

IC601(12, 13)

2-16

Something wrong with the system control?

Not available to Key Control?

YES

Checked the Tact switch?

Checked the Key line?

Checked the Front Panel Data Interface?

YES

Checked the Front Panel Data Interface?

YES

Checked the Front Panel Data Interface?

YES

SW901 ~ SW919

IC201(78, 79, 80)

CN401(2, 3, 4, 5, 6)

IC402, 403

IC401(74, 75, 76, 77, 78)

Something wrong with the system control?

Not available to Telephone Mute?

YES

Checked the mute control?

Checked the Mute Control?

CN901(7), Q903,Q904, IC401(43)

IC601(12, 13,15), IC801(23, 26, 27), Q806, Q863, Q151

2-17

Something wrong with the system control?

Not available to ANT(Motor Type) Control?

YES

Checked the ANT control?

CN901(10), IC901(12, 13), IC401(37)

Something wrong with the system control?

Not available to Remote(Power AMP)?

YES

Checked the Remote control?

CN901(9), Q907, Q906, IC401(44)

+ 51 hidden pages