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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 ............................................................................. 2-11
• BLOCK DIAGRAM .................................................................................................................... 2-21
• SCHEMATIC DIAGRAMS ........................................................................................................ 2-23
• WIREING DIAGRAM ................................................................................................................ 2-31
• PRINTED CIRCUIT DIAGRAMS .............................................................................................. 2-33
• INTERNAL BLOCK DIAGRAM OF ICs .................................................................................... 2-42
❍ SECTION 3. EXPLODED VIEWS
• CABINET AND MAIN FRAME SECTION ................................................................................... 3-1
• TAPE DECK MECHANISM: AUTOREVERSE DECK ................................................................. 3-3
• TAPE DECK MECHANISM: AUTOSTOP DECK(OPTIONAL) .................................................... 3-5
• CD MECHANISM ......................................................................................................................... 3-7
❍ SECTION 4. SPEAKER PART
• SPEAKER PART ........................................................................................................................ 4-1
❍ SECTION 5. REPLACEMENT PARTS LIST
• REPLACEMENT PARTS LIST .................................................................................................... 5-1
[CONTENTS]
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Summary of Contents for LG LX-M240 D
- 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 ................2-11 • BLOCK DIAGRAM ........................2-21 •...
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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 - 1-5 -... - Page 6 MEMO - 1-6 -...
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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 ON CD OPEN CLOSE CHECK CONNECTOR CHECK ( PN508,PN507 ) CHECK POWER SUPPLY CIRCUIT( PN508 ) CHECK MICOM INTERFACE CIRCUIT( PN507 ) “ READING ” DISPLAY CHECK CONNECTOR CHECK ( PN508,PN507,PN503,PN501 ) CHECK MICOM INTERFACE CIRCUIT( PN507 ) READING OK CHECK CONNECTOR CHECK(PN501,PN503) CHECK PICKUP MOVEMENT... - Page 9 • OPEN CLOSE NG CONNECTOR LOCKING CHECK ( PN508,PN507 ) CHECK POWER SUPPLY CIRCUIT( PN508 DEFECTIVE MAIN ,PN507) PN 508 PIN 8 = 6.2V, PIN 7 = 5V POEWR SUPPLY PN507 PIN 1 = 5V DEFECTIVE MICOM CHECK VOLTAGE CHANGE OF OPEN CLOSE, AND BTLMUTE VOLTAGE(= 5V) (PN507 PIN 12:OPEN, 13:CLOSE, 14:BTLMUTE) CHECK VOLTAGE CHANGE LO+, LO- OF IC503...
- Page 10 • “ READING ” DISPLAY CHECK (= ONLY “CD “DISPLAY) CONNECTOR LOCKING CHECK (PN508,PN507,PN503,PN501 ) CHECK POWER SUPPLY DEFECTIVE CONNECTOR OR PORT( PN508 ,PN507) MAIN POWER SUPPLAY PN508 PIN 8 = 6.2V, PIN 7 = 5V PN507 PIN 1 = 5V CHECK VOLTAGE THE PIN 2 OF DEFECTIVE IC505 IC505 PIN2 : 3.3V...
- Page 11 • READING OK CHECK (= “NO DISC” DISPLAY) CONNECTOR LOCKING CHECK(PN501,PN503) DOES SLED MOVE ? A A A A CHECK PN503 PIN 3,4( SL+,SL-) DEFECTIVE PICKUP OR IC503 OR IC501 OR IC502 DOES LENSE MOVE ? (= UP & DOWN) B B B B CHECK PN501 PIN 13,16 DEFECTIVE PICKUP OR...
- Page 12 • READING OK CHECK #A (= “NO DISC” DISPLAY) A A A A DOES SL+ WAVEFORM APPEAR AT ( IC503 PIN14 AND PN503 PIN3) WAVEFORM #2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT ( IC503 PIN 5) DEFECTIVE IC501 WAVEFORM #2 SLED DRIVE WAVE DEFECTIVE IC503...
- Page 13 • READING OK CHECK #B (= “NO DISC” DISPLAY) B B B B DOES FA+ WAVEFORM APPEAR AT ( IC503 PIN15 AND PN501 PIN16) WAVEFORM #3 FOCUS COIL DRIVE WAVE DOES FAIN- WAVEFORM APPEAR AT ( IC503 PIN 26) DEFECTIVE IC501 WAVEFORM #3 FOCUS DRIVE WAVE DEFECTIVE IC503...
- Page 14 • READING OK CHECK #C (= “NO DISC” DISPLAY) C C C C IS ?V APPLIED TO PIN10 OF PN501 LASER SUPPLY VOLTAGE CHECK IS 3.3 V APPLIED TO PIN3 OF IC502 RF IC SUPPLY VOLTAGE DEFECTIVE IC505 CHECK IS 2.0 V PIN2 OF IC502 DEFECTIVE IC502 LASER CONTROL VOLTAGE CHECK...
- Page 15 • READING OK CHECK #D (= “NO DISC” DISPLAY) D D D D DOES SP+ WAVEFORM APPEAR AT ( IC503 PIN12 AND PN503 PIN6) WAVEFORM #4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT DEFECTIVE IC501 ( IC503 PIN 6) WAVEFORM #4 SPINDLE DRIVE WAVE DEFECTIVE IC503...
- Page 16 • READING OK CHECK #E (= “NO DISC” DISPLAY) E E E E DOES TA+ WAVEFORM APPEAR AT ( IC503 PIN17 AND PN503 PIN15) WAVEFORM #5 TRACKING COIL DRIVE WAVE DOES TAIN- WAVEFORM APPEAR AT DEFECTIVE IC501 ( IC503 PIN 23) WAVEFORM #5 TRACKING DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN503...
- Page 17 ❏ WAVEFORMS OF MAKOR CHECK POINT #1 . MICOM INTERFACE WAVEFORM #2. SLED DRIVE AND MOTOR WAVEFORM (PN507 pin6, 8, 9, 1 0) during normal play (IC503 pin5, 1 4) when focus search #3. FOCUS DRIVE AND MOTOR WAVEFORM (TP56 1 , IC503 pin 1 5) - When focus search failed or there is no - There is disc on tray and focus search disc on tray...
- Page 18 #4. SPINDLE DRIVE AND MOTOR WAVEFORM #5. TRACK DRIVE AND MOTOR WAVEFORM (IC503 pin6, 1 2) when TOC reading (TP560, IC503 pin23) during normal play #6. RF, TRACKING AND FOCUS ERROR WAVEFORM (IC502 pin8, 2 1 , 23) during normal play - 2-12 -...
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Page 19: 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 20: Power Circuit
POWER CIRCUIT Check the Fuse Replace the Fuse CHECK THE AC VOLTAGE Check the DC output Replace the Transformer of C923(+) OF CN901 pin5, 6 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 21: Audio Abnormal
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 Output of IC401 Check the +12V of IC701 pin13... - Page 22 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 23 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 24 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 25 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 26 OAO(ORIENTATION ACOUSTIC OPTIMIZER) OPERATION Check the input signal of IC 401 pin 1, 3. Refer to power supply. Check the +12V of IC401 pin13. Check the +12V of IC401 pin13. Check the control of IC401 pin9. - 2-20 -...
- Page 27 • CD MAIN P.C. BOARD (SOLDER SIDE) - 2-41 -...
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Page 28: Internal Block Diagram Of Ics
❏ INTERNAL BLOCK DIAGRAM OF ICs I KIA6225P/S (IC201) BIPOLAR LINEAR INTEGRATED CIRCUIT - 2-42 -... - Page 29 I BA3126N (IC202) 2-channel head switch for radio cassette recoreders • Internal circuit configuration I BA3308 (IC203) Dual preamplifier with ALC - 2-43 -...
- Page 30 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 31 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 32 MEMO - 2-46 -...
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Page 33: Section 4. Speaker Section
SECTION 4. SPEAKER SECTION MODEL: LXS-M240 857A 860A 851A RUN DATA : 17-DEC.-03 LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS 3701RM0085A NET ASSEMBLY SPK LXS-M340 JERSEY NET ASSY 851A 3720RMF075A PANEL,FRONT SPK LXS-340 MOLD (LEFT) 851B 3720RMF076A PANEL,FRONT SPK LXS-340 MOLD (RIGHT) 6400DSMZ01A SPEAKER,TWEETER DT-13ND-1L SAMMI TWEETER(DOME) - Page 34 MEMO - 4-2 -...
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Page 35: Block Diagram
❏ BLOCK DIAGRAM 2-21 2-22... -
Page 36: Main Schematic Diagram
❏ SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM NOTE: Warning NOTE: Parts that are shaded are critical With respect Shaded(I) parts are critical for safety.Replace only to risk of fire or electrical shock. with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode. - Page 37 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 38 • CDP SCHEMATIC DIAGRAM 2-27 2-28...
- Page 39 • EALA(OAO) SCHEMATIC DIAGRAM 2-29 2-30...
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Page 40: Wiring Diagram
❏ WIRING DIAGRAM 2-31 2-32... -
Page 41: Printed Circuit Diagrams
❏ PRINTED CIRCUIT DIAGRAMS • MAIN/TUNER P.C. BOARD (SOLDER SIDE) 2-33 2-34... - Page 42 • MAIN/TUNER P.C. BOARD (COMPONENT SIDE) 2-35 2-36...
- Page 43 • EALA(OAO) P.C. BOARD (SOLDER SIDE) • EALA(OAO) P.C. BOARD (COMPONENT SIDE) 2-37 2-38...
- Page 44 • FRONT/POWER P.C. BOARD (SOLDER SIDE) • FRONT/POWER P.C. BOARD (COMPONENT 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. 2-39 2-40...
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Page 45: 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 46 • TAPE DECK MECHANISM: SINGLE AUTO REVERSE DECK LOCA.NO PART NO. SPECIFICATION 6720AF0002B CRM4205 PIGEON L-SINGLE A/RVS 6768R-UP03A 50-093-4941 PIGEON PWB ASSY CRM4205 6768R-BP03A 02-083-4252 PIGEON BELT/FELT CRM4205 6768R-PP03A 33-160-4309 PIGEON PRESS CASSETTE CRM4205 6768R-QP03A 50-093-4891 PIGEON MOTOR(ASSY) CRM4205 6768R-GP03B 50-222-4578 PIGEON GEAR CRM4205 6768R-SP01F 01-082-4598 PIGEON SPRING CWL44...
- Page 47 • TAPE DECK MECHANISM: SINGLE AUTO STOP DECK (OPTIONAL) LOCA.NO PART NO. SPECIFICATION 6720AF0001B CFM4206PIGEON L-SINGLE A/S 6768R-UP03B 50-093-4942 PIGEON PWB ASSY CFM4206 6768R-BP03B 02-083-4253 PIGEON BELT/FELT CFM4206 6768R-PP03A 33-160-4309 PIGEON PRESS CASSETTE CRM4205 6768R-QP03A 50-093-4891 PIGEON MOTOR(ASSY) CRM4205 6768R-GP03B 50-222-4578 PIGEON GEAR CRM4205 6768R-SP01F 01-082-4598 PIGEON SPRING CWL44...
- Page 48 • 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)