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LG LX-230A Manual
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LG LX-230A Manual

LG LX-230A Manual

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❍ SECTION 1. GENERAL
• SERVICING PRECAUTIONS ..................................................................................................... 1-2
• ESD PRECAUTIONS ................................................................................................................. 1-4
• SPECIFICATION ........................................................................................................................ 1-5
❍ SECTION 2. TROUBLESHOOTING
• ADJUSTMENTS ......................................................................................................................... 2-1
• TROUBLESHOOTING ............................................................................................................... 2-2
• WAVEFORMS OF MAJOR CHECK POINT ............................................................................... 2-6
• BLOCK DIAGRAM .................................................................................................................... 2-15
• SCHEMATIC DIAGRAMS ........................................................................................................ 2-17
• WIREING DIAGRAM ................................................................................................................ 2-23
• PRINTED CIRCUIT DIAGRAMS .............................................................................................. 2-25
• INTERNAL BLOCK DIAGRAM OF ICs .................................................................................... 2-33
❍ SECTION 3. EXPLODED VIEWS
• CABINET AND MAIN FRAME SECTION ................................................................................... 3-1
❍ SECTION 4. SPEAKER PART
• SPEAKER PART ........................................................................................................................ 4-1
❍ SECTION 5. REPLACEMENT PARTS LIST
• REPLACEMENT PARTS LIST .................................................................................................... 5-1
[CONTENTS]
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  • Page 1 [CONTENTS] ❍ SECTION 1. GENERAL • SERVICING PRECAUTIONS ..................... 1-2 • ESD PRECAUTIONS ......................... 1-4 • SPECIFICATION ........................1-5 ❍ SECTION 2. TROUBLESHOOTING • ADJUSTMENTS ......................... 2-1 • TROUBLESHOOTING ....................... 2-2 • WAVEFORMS OF MAJOR CHECK POINT ................2-6 • BLOCK DIAGRAM ........................2-15 •...

  • Page 2: Section 1. General

    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.

  • Page 3: Notes Regarding Compact Disc Player Repairs

    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.

  • Page 4: Esd Precautions

    ❐ 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.

  • Page 5: Specifications

    ❏ SPECIFICATIONS SECTION MODEL LX-230A General Power supply Refer to the back panel of the unit Power consumption Mass 4.35kg Extemal dimensions(W 268mm Frequency Response 40 -18000Hz Signal-to-noise ratio 70dB Dynamic range 70dB Tuning Range 87.5 -108.0MHz Intermediate Frequency 10.7 MHz...
  • Page 6 MEMO - 1-6 -...

  • Page 7: Section 2. Electrical Section

    SECTION 2. ELECTRICAL SECTION ❏ ADJUSTMENTS This set has been aligned at the factory and normally will not require further adjustment. As a result, it is not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers with the adjustment, realignment may be necessary.

  • Page 8: Troubleshooting

    ❏ TROUBLESHOOTING • CD PART Turn power on. Check power supply circuit. PN508 PIN8, 6.2V Is power on? PN508 PIN7, 5V IC503 PIN2, 3.3V Does initial Check the connector Check the DISK circuit read work? PN503, PN504, PN507 Check the Laser Check the focus circuit Check the TRAKING servo.
  • Page 9 FAILS TO INITIAL READ Check the Voltage change of Defective connector Disc motor turns PN 507 PIN2(OPEN, CLOSE) PN507 Does RF waveform Check the Data transferred from PN507 Defective connector appear? IC501 Pin3 pin8 to CD DSP PN507, Defective MICOM Check the Data transferred from Defective PN507 pin6 to MICOM...

  • Page 10: Open Close

    Laser does not light. Is “3.5V” applied to pin80 of IC801? Did pickup return to Is data transferred from Defective MICOM. innermost circular? MICOM IC ? Does voltage appear at IC 502 pin18, 19? Defective IC501, 502 Defective slide motor and/or connector.
  • Page 11 Laser lights Does lens move up/down? Defective IC501 Check the signal of FOCUS SEARCH (IC501 Pin 21) Chekc the signal of PN502 Defective IC502 pin 13, 14 Open activator and/or connector Does FE signal appear? (IC501 pin 13) Defective IC501 Degraded laser diode Does DRF signal appear? Defective PICK-UP...

  • Page 12: Waveforms Of Major Check Point

    ❏ WAVEFORMS OF MAJOR CHECK POINT 1. HF signal (RF signal ) waveform 2. EFM signal (IC501 pin 3)waveform (IC501 pin4) during normal play during Normal Play 0.5V/Div. 0.5V/Div. 500nS/Div. 5µS/Div. 3. Focus coil drive waveform(IC502 pin13) • Focus coil drive waveform(FDO: IC501 pin21) and •...

  • Page 13: Audio Part

    ❏ AUDIO PART P-SENS PART Does +5V appear at ZD901? Check the waveform of D937 (+). Replace the D937 Check the pattern of IC301 pin Replace ZD901. VKK PART Does DC - 27V appear at PN601 pin Check the DC -34V of C928(-) Replace the D936 Check the DC -27V of ZD 902(-)

  • Page 14: Power Circuit

    POWER CIRCUIT Check the Fuse Replace the Fuse CHECK THE AC VOLTAGE Check the DC output Replace the Transformer OF CN901 pin5, 6 of C923(+) Replace the D925, D926, D927, D928 Check the DC 12V Output of IC901 Check the DC VOLTAGE of D939(+) Replace the D939 Replace the IC902...

  • Page 15: Muting Circuit (Mute)

    MUTING CIRCUIT (MUTE) Dose “High” appear at Q701, Q751“B” Check the “High” of PN601 pin12 Check the “High” of the IC301 pin2 Refer to IC 301 Troubleshooting check the “Low” of Q701, Q751, “C” Replace the Q703 MUTE Replace the TR AUDIO ABNORMAL Check the signal output of IC701 pin2, 4...

  • Page 16: Function Mode Audio Abnormal

    FUNCTION MODE AUDIO ABNORMAL TAPE Check the signal input of IC601 pin6, 23 Refer to “IC201 Troubleshooting” Chekc the signal input of IC601, pin5, 24 Check the signal input of JK601 Check the signal input of IC601 pin3, 26 Check the signal input of CN603 pin6, 8 TUNER Check the signal input of IC601 pin4, 25 Refer to “TUNER PACK Troubleshooting”...
  • Page 17 IC301 TROUBLESHOOTING Check the power supplying IC301 pin17, 46, 72, 90? Refer to “Power Circuit Troubleshooting” Check the P-SENS “High” of IC301 pin26 Check the P-SENS Check the oscillation of X301 Replace the X301 When power supplying to IC301 pin12. (Low ©...
  • Page 18 TUNER PACK TROUBLESHOOTING Check the PLL- of CE, DI, DO, CLK CE: Chip Enable DI: Data Input(from u-com) DO: Data Output(to u-com) CLK: Tuner mode clock Is the normal ? Replace the TUNER PACK TUNER PACK POWER TROUBLESHOOTING Check the +9V of OPN602 pin2 Check the +DC C670 Refer to “Power circuit Check the GND of PN602 pin4, 10...
  • Page 19 REC (Q252, Q202 ON / R273, R223 HIGH) Check signal supplied to IC203 pin2, 8 ? Check the “Low” of Q202, Q252 “B” Check the “Low” of IC501 pin9 Replace the Q202, Q252 Check the output of IC203 pin3, 7 Check the Vcc power of IC203 Pin6 Check the “voltage”...
  • Page 20 MEMO - 2-14 -...

  • Page 21: Block Diagram

    BLOCK DIAGRAM 2-15 2-16...

  • Page 22: Schematic Diagrams

    SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM NOTE: NOTE: Warning Shaded(I) parts are critical for safety.Replace only Parts that are shaded are critical With respect with specified part number. to risk of fire or electrical shock. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
  • Page 23 FRONT/POWER SCHEMATIC DIAGRAM NOTE: NOTE: Warning 1. Shaded(I) parts are critical for safety.Replace only Parts that are shaded are critical With respect with specified part number. to risk of fire or electrical shock. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
  • Page 24 • CDP SCHEMATIC DIAGRAM 2-21 2-22...

  • Page 25: Wiring Diagram

    WIRING DIAGRAM 2-23 2-24...

  • Page 26: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS • MAIN/TUNER P.C. BOARD(SOLDER SIDE) 2-25 2-26...
  • Page 27 • MAIN/TUNER P.C. BOARD(COMPONENT SIDE) 2-27 2-28...
  • Page 28 • FRONT/POWER P.C. BOARD (COMPONENT SIDE) • FRONT/POWER P.C. BOARD (SOLDER SIDE) NOTE: Warning NOTE: Warning Parts that are shaded are critical With respect Parts that are shaded are critical With respect to risk of fire or electrical shock. to risk of fire or electrical shock. 2-29 2-30...
  • Page 29 • CD MAIN P.C. BOARD (SOLDER SIDE) - 2-31 -...
  • Page 30 • CD MAIN P.C. BOARD (COMPONENT SIDE) - 2-32 -...

  • Page 31: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM OF ICs I KIA6225P/S (IC201) BIPOLAR LINEAR INTEGRATED CIRCUIT - 2-33 -...
  • Page 32 I BA3126N (IC202) 2-channel head switch for radio cassette recoreders • Internal circuit configuration I BA3308 (IC203) Dual preamplifier with ALC - 2-34 -...
  • Page 33 I LC78645E (IC501) Digital Servo Block Diagrams • Overview The focus servo circuit performs analog/digital conversion on FE(the focus error signal), while the tracking and sled servo circuits do so on TE(the tracking error signal), then they each pass that result through an equalizer, perform digital/analog conversion, and output it, At the spindle servo, based on the EFM signal during CLV control or the FG signal during CAV control, the calculated value passes through an equalizer, undergoes digital/analog conversion, and is output.
  • Page 34 I FAN8039BD3 (IC502) 5-CH Motor Driver • PIN Definitions Symbol Description Symbol Description DO1- CH1 Drive Output (-) GND2 Power Ground1 (CH 2,3,5) DO1+ CH1 Drive Output (+) DO5+ CH5 Drive Output (+) CH1 Drive Input DO5- CH5 Drive Output(-) REGVCC Regulator Supply Voltage DO3-...
  • Page 35 I TDA7265 (LX-230 IC701) 25 +25W STEREO AMPLIFIER WITH MUTE & ST-BY • DESCRIPTION The TDA7265 is class AB dual Audio power am-plifier assembled in the Multiwatt package, spe-cially designed for high quality sound application as Hi-Fi music centers and stereo TV sets. •...
  • Page 36 MEMO - 2-38 -...

  • Page 37: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS • CABINET AND MAIN FRAME SECTION NOTE) Refer to “SECTION 5 REPLACEMENT PARTS LIST” in order to look for the part number of each part. TUNER...
  • Page 38 • CD MECHANISM LOCA.NO. PART NO DESCRIPTION SPECIFICATION 6721RJ0323A DECK ASSEMBLY,AUDIO CDP(CDM-300) CKD-HZ 4861RH0004A CLAMP ASSEMBLY DISC (CDM-300) 4405RHD009A MECHANISM ASSEMBLY MAIN LOADING CDP (CDM-300) 6717RCA001A PICK UP ASSY KSM-213VSCM SONY FRONT LOADING 3300R-0547B PLATE CLAMP (CDM-300) 524-012AAAA COVER CLAMP MAGNET (030X018X5T) 4860R-0016A CLAMP DISC (CDM-300)

  • Page 39: Section 4. Speaker Section

    SECTION 4. SPEAKER SECTION MODEL: LXS-230 LXS-230 RUN DATE : 26.MARCH.2003 LOCA.NO. PART NO. DESCRIPTON SPECIFICATION REMARKS 3701RM0039A NET ASSEMBLY LXS-230, NET ASSY 3720RMF043A PANEL,FRONT FRONT LX-230, RESIN:L.GRAY, SP 6400SCSG03A SPEAKER,FULLRANGE CW-125B30L SAMMI 6-0 OHM 30 W 4766RM0012A FELT FE-196E BLACK WOOFER 4766RM0029A FELT 1.0T BLACK LXS-230, FOR DUCT...
  • Page 40 MEMO - 4-2 -...

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