LG LX-230A Manual Download Page 33 | Manualshive

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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.

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BU2090F (IC501)

-12 -bit, Serial IN, parallel OUT driver

Control circuit

12-bit shift register

Latch

V

SS

2

1

3

4

5

6

7

8

DATA

CLOCK

Q0

Q1

Q2

Q3

Q4

16

15

14

13

12

11

10

9

V

DD

Q11

Q10

Q9

Q8

Q7

Q6

Q5

Output buffer

(open drain)

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Summary of Contents for LX-230A

Page 1: ...OUBLESHOOTING 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 ...

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: ...z Signal to noise ratio 35 dB Frequency Response 100 1800 Hz AMP Output Power 18W T H D 0 15 Frequency Response 40 25000Hz Signal to noise ratio 80dB TAPE Tape Speed 4 75cm sec Wow Flutter 0 25 MTT 111 JIS WTD F F REW Time 120sec C 60 Frequency Response 250 8000Hz Signal to noise ratio 43dB Channel Separation 50dB P B 45dB R P Erase Ratio 55dB MTT 5511 Speaker MODEL LXS 230 Type 1 Way 1 Speaker Im...

Page 6: ... 1 6 MEMO ...

Page 7: ...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 8: ...output audio Check power supply circuit PN508 PIN8 6 2V PN508 PIN7 5V IC503 PIN2 3 3V Check the connector PN503 PN504 PN507 Check the tracking servo Check the PN508 PIN1 3 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 ...

Page 9: ...Check the change of SL SL Voltage IC502 pin 18 19 Check the Voltage change of PN 507 PIN2 OPEN CLOSE Defective connector PN507 Defective connector PN507 Defective MICOM Defective connector PN507 Defective IC501 Defective IC501 Defective IC502 Defective contact PN503 Defective PICK UP Does laser light focus coil drive wareform TRACKINGERRORwareform Is rotation normal Defective IC501 Defective PICK ...

Page 10: ... at IC 502 pin18 19 Defective MICOM Defective MICOM Defective connector Defective IC501 502 Defective slide motor and or connector Defective LMT SW and or connector Defective Q 501 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 5 of PN503 R508 1 0V R508 1 0V YES YES YES...

Page 11: ...wn Check the signal of FOCUS SEARCH IC501 Pin 21 Chekc the signal of PN502 pin 13 14 Does FE signal appear IC501 pin 13 Does DRF signal appear IC501 pin67 Defective IC501 Defective IC502 Open activator and or connector Defective IC501 Degraded laser diode Defective PICK UP ...

Page 12: ...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 502 pin18 During normal play CH1 FOCUS COIL DRIVE SIGNAL 2V Div CH2 DRF CH1 TRACKING COIL DRIVE SIGNAL 2V Div IC502 pin27 CH2 TRACKING ERROR TE IC501 pin15 1V Div CH1 TRACKING COIL DRIVE IC502 pin27 SIGNAL 2V Div CH2 TRACKING ERROR TE IC501 pin15 1V Div CH...

Page 13: ...34V 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 5V appear at ZD901 Check the pattern of IC301 pin Check the waveform of D937 Replace ZD901 Replace the D937 YES YES NO NO 26 16 ...

Page 14: ...CK THE AC VOLTAGE OF CN901 pin5 6 Check the DC VOLTAGE of D939 Replace the Q501 Replace the D925 D926 D927 D928 Replace the IC902 Check DC VOLTAGE OF D930 Check the LOW of IC501 pin8 Check the High of Q605 B Replace the Q604 Replace the IC902 Replace the Transformer Replace the D939 Replace the D930 Replace the IC501 Check the High of IC501 pin4 YES YES YES YES YES YES YES YES YES YES YES NO NO NO...

Page 15: ... Q702 B Check the High of IC701 pin5 Check the power of IC701 Check the connecting to SPEAKER YES YES YES NO NO NO MUTING CIRCUIT MUTE Dose High appear at Q701 Q751 B check the Low of Q701 Q751 C MUTE Check the High of PN601 pin12 Check the High of the IC301 pin2 Replace the Q703 Replace the TR Refer to IC 301 Troubleshooting YES YES YES NO NO NO ...

Page 16: ...n6 23 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 pin3 26 Check the signal input of CN603 pin6 8 Check the signal input of IC601 pin4 25 Refer to TUNER PACK Troubleshooting CD TUNER ...

Page 17: ...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 pin12 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 18: ...OWER TROUBLESHOOTING Check the 9V of OPN602 pin2 Check the DC C670 Check the pattern Refer to Power circuit Troubleshooting Check the GND of PN602 pin4 10 END YES YES YES NO 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 YE...

Page 19: ...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 IC501 pin9 Refer to Power Circuit Troubleshooting Check the 0 6V of Q205 B Replace the L201 YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO ...

Page 20: ... 2 14 MEMO ...

Page 21: ...2 15 2 16 BLOCK DIAGRAM ...

Page 22: ...8 NOTE 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 23: ... 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 24: ... CDP SCHEMATIC DIAGRAM 2 21 2 22 ...

Page 25: ...2 23 2 24 WIRING DIAGRAM ...

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

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

Page 28: ...ONENT SIDE FRONT POWER P C BOARD SOLDER SIDE NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 29: ... 2 31 CD MAIN P C BOARD SOLDER SIDE ...

Page 30: ... 2 32 CD MAIN P C BOARD COMPONENT SIDE ...

Page 31: ... 2 33 INTERNAL BLOCK DIAGRAM OF ICs KIA6225P S IC201 BIPOLAR LINEAR INTEGRATED CIRCUIT ...

Page 32: ... 2 34 Internal circuit configuration BA3126N IC202 2 channel head switch for radio cassette recoreders BA3308 IC203 Dual preamplifier with ALC ...

Page 33: ...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 BU2090F IC501 12 bit Serial IN parallel OUT driver Control circuit 12 bit shift register Latch VSS 2 1 3 4 5 6 7 8 DATA CLOCK Q0 Q1 Q2 Q3 Q4 16...

Page 34: ...tor Output 19 DO3 CH3 Drive Output 6 REO Regulator Feedback Input 20 IN3 CH3 Drive Input 7 RESX Regulator Reset 21 VCC1 Supply Voltage1 CH2 CH3 CH5 8 GND1 Signal Ground 22 PS Power Save 9 CTL CH5 Motor Speed Control 23 VREF Bias Voltage 10 FWD CH5 Forward Input 24 VCC Supply Voltage CH1 CH4 11 REV CH5 Reverse Input 25 IN4 CH4 Drive Input 12 IN2 CH2 Drive Input 26 DO4 CH4 Drive Output 13 DO2 CH2 Dr...

Page 35: ...MPLIFIER 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 PIN CONNECTION Top view ...

Page 36: ... 2 38 MEMO ...

Page 37: ...ND MAIN FRAME SECTION 351 459 301 A47 310 TUNER A46 A41 274 272 A26 257 255 250 261 260 271 278 279 286 277 A00 284 285 275 302 303 305 A43 273 459 NOTE Refer to SECTION 5 REPLACEMENT PARTS LIST in order to look for the part number of each part ...

Page 38: ...3300R 0547B PLATE CLAMP CDM 300 002 524 012AAAA COVER CLAMP MAGNET 030X018X5T 003 4860R 0016A CLAMP DISC CDM 300 004 4930R 0171A HOLDER CLAMP 011 3040R 0073A BASE P U CDM 300 012 5040R 0073A RUBBER DAMPER CDM 300 BK 013 4400R 0006A BELT LOADING 014 4470R 0055A GEAR PULLEY 015 6871RC2016A PWB PCB ASSEMBLY CD LOADING CDM 300 017 4470R 0056A GEAR LOADING 018 4974R 0023A GUIDE UP DOWN 020 3040R 0072A ...

Page 39: ...NT FRONT LX 230 RESIN L GRAY SP 852 6400SCSG03A SPEAKER FULLRANGE CW 125B30L SAMMI 6 0 OHM 30 W 853 4766RM0012A FELT FE 196E BLACK WOOFER 854 4766RM0029A FELT 1 0T BLACK LXS 230 FOR DUCT 855 3091RMW048A CABINET ASSEMBLY LXS 230 CABINET ASSY 856 6852SCK004A CORD A V FE M100E 0 16 18 2C CORD 857 3610RM0009A FOOT LXS 330 EVA BLACK PHI15X1T 858 353M050C SCREW BH 3 5X16 FBK LXS 230 RUN DATE 26 MARCH 20...

Page 40: ... 4 2 MEMO ...

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