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LG LX-E330A Manual Download Page 22

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LC78646E (IC801)

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.

Summary of Contents for LX-E330A

Page 1: ...LESHOOTING 2 2 WAVEFORMS OF MAJOR CHECK POINT 2 6 BLOCK DIAGRAM 2 15 SCHEMATIC DIAGRAMS 2 17 WIREING DIAGRAM 2 23 PRINTED CIRCUIT BOARD DIAGRAMS 2 25 INTERNAL BLOCK DIAGRAM OF ICs 2 35 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 ...

Page 2: ... 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 theref...

Page 3: ... 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 1MΩ 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 escap...

Page 4: ...es 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 co...

Page 5: ...made to modificate any circuit If any parts are replaced or if anyone tampers with the adjustment realignment may be necessary IMPORTANT 1 Check Power source voltage 2 Set the function switch to band being aligned 3 Turn volume control to minimum unless otherwise noted 4 Connect low side of signal source and output indicator to chassis ground unless otherwise specified 5 Keep the signal input as l...

Page 6: ...uit PN808 PIN1 12V PN808 PIN2 6 2V PN808 PIN3 5V IC803 PIN2 3 3V ChecktheconnectorPN801 PN802 PN803 PN807 PN808 Check the tracking servo Check the PN808 PIN8 9 OK NO YES YES YES NO NO NO NO NO NO Check the DISK circuit Check the Laser Check the focus circuit Check the TRAKING servo NO NO TROUBLESHOOTING CD PART ...

Page 7: ...n23 Check the change of SL SL Voltage IC802 pin 13 14 Defective connector PN802 DovoltageN807PIN11 MM PIN 12 MM PIN13 SOL change DefectiveconnectionPN807 ChecktheMICOM Defectiveconnector PN807 DefectiveMICOM Defective connector PN807 Defective IC801 Defective IC801 Defective IC802 Defective contact PN803 Defective PICK UP Does laser light focus coil drive wareform TRACKING ERROR wareform Is rotati...

Page 8: ... at IC 802 pin13 14 Defective MICOM Defective MICOM Defective connector Defective IC801 802 Defective slide motor and or connector Defective LMT SW and or connector Defective Q 801 and or laser Defective laser and or connector Did pickup return to innermost circular Does it stop at inner pick circular after shift Is defect output from LM SW applied to pin 2 of PN803 R808 1 0V R808 1 0V YES YES YES...

Page 9: ...wn Check the signal of FOCUS SEARCH IC801 Pin 21 Chekc the signal of PN801 pin 13 16 Does FE signal appear IC801 pin 13 Does DRF signal appear IC801 pin67 Defective IC801 Defective IC802 Open activator and or connector Defective IC801 Degraded laser diode Defective PICK UP ...

Page 10: ...raverse 1 When time division is 20mS Div 1V Div 3 When time division is 0 5nS div During backward Track Traverse 5 Feed motor drive waveform IC 802 pin14 During normal play CH1 FOCUS COIL DRIVE SIGNAL 2V Div CH2 DRF CH1 TRACKING COIL DRIVE SIGNAL 2V Div IC802 pin27 CH2 TRACKING ERROR TE IC801 pin15 1V Div CH1 TRACKING COIL DRIVE IC802 pin17 SIGNAL 2V Div CH2 TRACKING ERROR TE IC802 pin15 1V Div CH...

Page 11: ...4V of C928 Check the DC 27V of ZD 902 Check the DC 27V of Q901 E Check the PATTERN Replace the D936 Replace the ZD902 Replace the Q901 YES YES YES YES NO NO NO NO P SENS PART Does 4 2V appear at ZD901 Check the pattern of IC301 pin Check the waveform of D937 Replace ZD901 Replace the D937 YES YES NO NO 26 10 ...

Page 12: ...E AC VOLTAGE OF CN901 pin5 6 Check the DC VOLTAGE of D939 Replace the IC301 Replace the D925 D926 D927 D928 Replace the IC902 Check DC VOLTAGE OF D930 Check the High of PN601 pin18 Check the LOW of Q605 B Replace the Q604 Replace the IC902 Replace the Transformer Replace the D939 Replace the D930 Check the H of IC301 PIN3 Check the Low of IC301 pin24 YES YES YES YES YES YES YES YES YES YES YES NO ...

Page 13: ... the High of Q705 B Check the High of IC701 pin10 Check the power of IC701 Check the connecting to SPEAKER YES YES YES NO NO NO MUTING CIRCUIT MUTE Base High appear at Q701 Q751 B check the Low of Q701 Q751 C MUTE Check the High of PN601 pin19 Check the High of the IC301 pin2 Replace the TR Refer to IC 301 Troubleshooting YES YES YES NO ...

Page 14: ...n3 26 Refer to IC201 Troubleshooting AUX Chekc the signal input of IC601 pin5 24 Check the signal input of JK601 Check the signal input of IC601 pin6 23 Check the signal input of CN603 pin6 8 Check the signal input of IC601 pin4 25 Refer to TUNER PACK Troubleshooting CD TUNER ...

Page 15: ...cuit Refer to Power Circuit Troubleshooting Check the Data of IC301 pin9 10 CD TAPE FUNCTION Replace the IC601 Check the pattern Check the P SENS High of IC301 pin26 Check the oscillation of X301 When power supplying to IC301 pin11 Low High Replace the IC301 Check the power supplying to IC601 pin1 Check the CLK Data of IC601 pin14 15 Check the IC601 FUNCTION SELECTOR END YES YES YES YES YES YES YE...

Page 16: ... u com DO Data Output to u com CLK Tuner mode clock Replace the TUNER PACK YES NO PLAY Check the VCC supplying to IC201 pin4 Refer to Power Circuit Troubleshooting Check the Deck Mecha Replace the Deck Mecha Replace the IC201 Check the signal output of IC201 pin3 6 Check the LOW of Q201 Q251 B YES YES YES NO NO NO ...

Page 17: ...plying to C227 Check the oscillation of Q204 E Check the signal of R212 R262 Check the Pattern Check the Vcc power of IC203 Pin6 Check the oscillation of L201 pin 1 3 Replace the DECK Check the Low of Q202 Q252 B Replace the Q202 Q252 Check the Low of IC301 pin77 Refer to Power Circuit Troubleshooting Check the 10V of R228 B Replace the L201 YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO ...

Page 18: ... 2 33 CD P C BOARD SOLDER SIDE ...

Page 19: ... 2 34 CD P C BOARD COMPONENT SIDE ...

Page 20: ... 2 35 INTERNAL BLOCK DIAGRAM OF ICs KIA6225P S IC201 BIPOLAR LINEAR INTEGRATED CIRCUIT STK403 030 IC701 Equivalent Block Diagram ...

Page 21: ... 2 36 Internal circuit configuration BA3126N IC202 2 channel head switch for radio cassette recoreders BA3308 IC203 Dual preamplifier with ALC ...

Page 22: ...ng 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 23: ... 4 1 MODEL LXS E330 871 873 868 872 870 869 867 865 863 862 861 850 864 866 SECTION 4 SPEAKER SECTION ...

Page 24: ...2 15 2 16 BLOCK DIAGRAM ...

Page 25: ...SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAMS 2 17 2 18 ...

Page 26: ... 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmefer during Play mode NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 27: ... CDP SCHEMATIC DIAGRAM 2 21 2 22 ...

Page 28: ...2 23 2 24 WIRING DIAGRAM ...

Page 29: ...PRINTED CIRCUIT BOARD DIAGRAMS MAIN P C BOARD SOLDER SIDE 2 25 2 26 ...

Page 30: ...2 27 2 28 MAIN P C BOARD COMPONENT SIDE ...

Page 31: ... FRONT POWER P C BOARD SOLDER SIDE 2 29 2 30 ...

Page 32: ... FRONT POWER P C BOARD COMPONENT SIDE 2 31 2 32 ...

Page 33: ...SECTION 351 301 306 305 TUNER 310 311 303 302 A00 284 250 263 286 279 261 260 264 262 280 273 278 272 A43 271 275 274 276 277 285 315 A26 257 A41 NOTE Refer to SECTION 5 REPLACEMENT PARTS LIST in order to look for the part number of each part 3 1 3 2 ...

Page 34: ...ERSE DECK 400 011 503 401 401 009 010 501 502 507 508 013 406 409 410 036 032 038 034 035 039 029 040 031 028 027 026 014 015 403 504 024 025 023 405 A01 402 022 016 017 018 019 020 021 505 007 008 003 004 005 002 404 400 400 506 037 006 ...

Page 35: ...SM AUTO STOP DECK OPTIONAL 400 011 503 401 401 009 010 501 502 013 406 409 408 407 032 031 030 029 028 401 027 026 014 015 403 504 024 025 023 405 A01 402 022 016 017 018 019 020 021 505 007 008 003 004 005 002 404 400 400 006 ...

Page 36: ...3 7 3 8 163 155 156 154 162 165 161 159 158 157 153 152 151 CD MECHANISM ...

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