LG-2300N-cd-sch 电路图 维修手册.pdf

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1、NOTES) Warning NOTES) Parts that are shaded are critical NOTES) With respect to risk of fire or NOTES) electricial shock. 3-183-19 CIRCUIT DIAGRAM 1. POWER(SMPS) CIRCUIT DIAGRAM IMPORTANT SAFETY NOTICE WHEN SERVICING THIS CHASSIS, UNDER NO CIR- CUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR AL

2、TETED WITHOUT PERMISSION FROM THE ZENITH ELECTRONICS CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGI- NAL CIRCUIT SPECIAL COMPONTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION. THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF- FER FROM THE ACTUAL CIRCUIT

3、 USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTILTHE NEW SERVICE LITERATURE IS PRINTED. NOTE : 1. Shaded( ) parts are critical for safety. Replace only with specified part number. 2. Voltages are DC-measured with a digital volt

4、meter during Play mode. IC903 PIN3 (AC110V, PLAY)IC901 PIN3 (AC110V, STAND-BY) IC902 is defective. 8V Power Line dead. Q908, R928, D913 and Q909 are defective. 5V Power Line dead. Q901 and Q902 are defective. FLD(+), FLD(-) are dead. Q903, Q904 are defective. Power control is abnormal. IC901 is defe

5、ctive. Power dead. C927, R918, R922 and IC905 are defective. Power dead. RadioFans.CN 收音机爱 好者资料库 3-203-21 RF/TE/FE Signal generation DRAM Digital Servo DSP/ CD Decoder AD Ref. Voltage Gen TZC Mirr. Generator 3.3V Regulator Spindle Low Pass Filter T.E F.E R.F TRACKING LOOP FOCUS LOOPSPINDLE LOOP SLED

6、 LOOP Q202 is defective. DVD LD will not be on. Q203 is defective CD LD will not be on IC403 is defective No Spindle Full Speed IC219 is defective Servo will not operate IC204 is defective being slipped during search. IC209 is defective AD Converter Error 2. RF No Power on Video output level is unst

7、able OPEN, Close Error Servo will not operate D00:15 ; FLD Error A00:21 ;FLD Error 3-323-33 7. FRONT(TIMER) & KEY CIRCUIT DIAGRAM FRONT CONTROL OPEN/CLOSE POWER Remocon Receiver RESET ENTER 4 Direction S/W SFUTTLE SW509 is defective Direction Key is defect JS500 is defective SCAN +/- wll not operate

8、 IC501 is defective Reset Error RE500 is defective R/C receiver Error DIG501 is defective FLD is distorted Q500 is defective LED will not operate 3-343-35 8. JACK CIRCUIT DIAGRAM S VIDEO (C) AUDIO (L) AUDIO (R) OPTICAL COMP.VIDEO S VIDEO (Y) EXT/DVD cant be changed16:9 cant be changedScart Mode cant

9、 be changed IC903 Pin 3 PLAY(AC110V) 3-263-27 WAVEFORM IC901 Pin 3 STAND-BY(AC110V) (POWER)(VIDEO ENCODER) (RF/SERVO) IC201 Pin 21, Focus Error IC201 Pin 19, SBADD IC201 Pin 20 Tracking Error Tek Stop : 1 00kS/s3290 Acqs M 500sCH1 280/mV Record Length Fit to Screen OFF Time Base Main Trigger Positio

10、n 50% Horiz Scale (/div) Horiz Pos FastFrame Setup more 1 of 3 3 Ch31.00V T T Record Length 2500 T 2500 points in 50divs 1000 points in 20divs 500 points in 10divs IC800 Pin 28 35 , MPEG Data IC801 Pin 13 16 , 19 22 , MPEG Data IC800 Pin 10, Composite IC801 Pin 57, Composite IC800 Pin 12, Chrominanc

11、e IC801 Pin 58, Chrominance Tek Stop : 2.50MS/s4 Acqs M20.0s 2 Apr 1999 14:47:27 GlitchCh1 Ch3500mV T T 3 IC800 Pin 13, Luminance IC801 Pin 59, Luminance IC800 Pin 40, 41 SDA/SCL IC801 Pin 75, 76 SDA/SCL Tek Stop : 1 00kS/s3290 Acqs M 500sCH1 280/mV Edge Slope Type Source Ch1 Coupling DC Level 280mV

12、 Mode & Holdoff 3 Ch31.00V T T Slope T IC800 Pin 43, MPEG Clock(27MHz) IC801 Pin 71, MPEG Clock(27MHz) Tek Stop : 10.0kS/s13 Acqs M 5 .00msCH1 280/mV Edge Slope Type Source Ch1 Coupling DC Level 280mV Mode & Holdoff 3 Ch31.00V T Slope T IC800 Pin 49, Vertical SYNC IC801 Pin 24, Vertical SYNC Tek Sto

13、p : 2.50MS/s7 Acqs M 20.0sCH1 280/mV Edge Slope Type Source Ch1 Coupling DC Level 280mV Mode & Holdoff 3 Ch31.00V T Slope T IC800 Pin 50 Horizontal SYNC IC801 Pin 59 Horizontal SYNC IC801 Pin 42 Component Pb IC801 Pin 43 Component PrIC801 Pin 44 Component Y IC201 Pin 20 VBR TRACKING Error IC201 Pin 28, RF IC206 Pin 88, SLED Drive(FMO) IC202 Pin 18, SLED FG IC201 Pin 21, Focus Error(in Focus Search) IC206 Pin 83, Focus Drive(FDO)