Daewoo-DCB87-cd-sm维修电路原理图.pdf

DVH-100ARadioFans.CN 收音机爱 好者资料库1SPECIFICATIONS.2ADVANTAGES OF THIS PRODUCT.3TROUBLE SHOOTING.5WAVEFORMS.23CIRCUIT DIAGRAM.26PCB CIRCUIT BOARD.36INSTRUMENT DISASSEMBLY.39ELECTRICAL PARTSLIST.45CONTENTSRadioFans.CN 收音机爱 好者资料库2SPECIFICATIONSDisc typeDVDVIDEO-CDCDAnalogue Audio output48/96KHz sampling44.1KHz sampling44.1KHz samplingDigital Audio output48KHz sampling44.1KHz sampling44.1KHz samplingOptical digital audio output48KHz sampling44.1KHz sampling44.1KHz samplingOutputPower200-240V, 50/60HzConsumed electricity22WWeight4.6kgDimension (W x H x D)435mmx93mmx255mmOperative temperature+5C40CInstallation conditionHorizontal / Relative humidity under 80%Laser output5mW (continuous wave max.)Wave length635nm (DVD), 730nm (CD)Signal typePAL COLORAntenna Input/outputU/V-mixed: 75unbalanced VIDEO input1.0Vp-p (unbalanced, RCA JACK)AUDIO input-8.8dBm, RCA JACKVIDEO output(common use of DVD and VCR)VIDEO output terminal, 1.0 Vp-p unbalanced, RCA JACK, SCART JACKVIDEO output (DVD only)RGB output (75In load R: 0.7Vp-p, G:0.7Vp-p, B:0.7Vp-p)AUDIO output(common use of DVD and VCR)Audio output terminal (2 kinds): -5.8dBm(VCR), 2Vrms(DVD), RCA JACKAUDIO output (DVD only)Analogue AUDIO output : 2.0VrmsDigital audio output (OPTICAL, COAXIAL)Playable tapeVery high dense tapes with VHS marks Playable discDVD, VIDEO-CD, CD (12cm), CD (8cm), MP3, CD-R, CD-RWTape speedSP: 23.39mm/s, LP: 11.70mm/sPlaytimeSP: 3hrs, LP: 6hrs (use of E180tape)Clock display24 hrsTime Recording8 programs a monthPersistence in power failure1minVIDEO S/N (VCR)Over 43dB(Standard recording)Resolution VCROver 240 lines (Standard recording)DVDOver 400 lines (Playback DVD)AUDIO (VCR)Over 65dBAUDIO (DVD)90dBAUDIO dynamic range90dBDVD Audio output standardsADVANTAGES OF THIS PRODUCT3 DVD, VCD, CD, CD-R(MP3), CD-RW, VHS Watching DVD for recording broadcast Integrated remote control (VCR, DVD) VISS function Multiplex sound playback/record High Sound Quality of 6 head Hi-Fi Simple record function MP3 file playback function (CD-R disc having records of MP3 files) GUI (Graphical User Interface) through OSD (On Screen Display) By using the DISPLAY button on the remote control, information on the DVD/VCD/CD player and disc, can bedisplayed on the TV screen. Screensaver function (DVD) 3D sound (3D sound effect using 2 speakers) High bit / High sampling with 27MHz / 10bit video encoder High bit / High sampling with 96MHz / 24bit Audio D/A Converter Coaxial, Optical digital Audio output (PCM, Dolby Digital, dts) You can enjoy high-level digital audio by connecting with amp embedded with Dolby Digital / dts decoder. Built-in Dolby Digital decoder (DVD) Analog audio 2-channels output for DOWNMIX (x1) Composite video output (x1) Slow Forward / Reverse playback (DVD) Fast Forward / Reverse playback Search of title, chapter, and time in DVD disc, and search of time and track time in VCD. Various TV aspect (DVD)4:3 for Pan and Scan, 4:3 for Letter Box, and 16:9 for Wide Repeat playback (title, chapter, and part for DVD/ track, disc, and part for VCD/CD) Selective Play (DVD/VCD/CD)You can select and play the desired title / chapter of DVD and track of Video CD/CD in STOP mode. Parental Lock function (DVD) This function can prevent playback of software that may be unsuitable for children. Multi Audio function (DVD) The audio soundtrack can be heard in up to 8 languages. In the case of SVCD or VCD, it depends on the disc. (Thenumber of audio languages depends on the software.) 4ADVANTAGES OF THIS PRODUCT Multi Subtitle function (DVD) The subtitle can be seem in up to 32 languages. In the case of SVCD or VCD, it depends on the disc. (The number ofsubtitle languages depends on the software.) Multi Angle function (DVD) This function allows you to choose the viewing angle of scenes which were shot from a number of different angles.(The number of angles depends on the software.) Screen zoom function (DVD/VCD)5TROUBLESHOOTING1. POWER CIRCUIT CAUTIONYou must use insulated transformer during the first part test of POWER circuit.Check IC501, IC701No powerPOWER cord is ok?Is 400V200V voltageobtained at C804 +?Output voltage of 2ndparts is normal?Check rectifier diode of 2ndparts ;D821, D822, D823, D824,D825, D826, D827Switching pulse of Q801 collector isnormal?OKExchange POWER CORDCheck F801.Exchange rectifier diode of 2ndparts ; D821, D822, D823, D824,D825, D826, D827.Check Q801.NOYESYESYESYESYESNONONONO2. SYSTEM CIRCUIT6TROUBLESHOOTINGNo LED display.Is 5V obtained at IC701 pin #9, 25?Oscillation at IC701pin #1? Specific GRID/SEG doesnt function.Check R588, D857, L503, L860Exchange IC701.Check IC 701 pin #2224, 27,28, 30, 31.Check IC 701 pin #1012, 1421.NOYESYESNONOGRID output at PORT of IC701?YESSEGoutput at PORT of IC701?Exchange IC701.YESA. LED DISPLAYNO7TROUBLESHOOTINGNoise appears on theplayback screen.Is noise diminished by trackingadjustment.Noise band is trembled up anddown?Re-adjust PATH.Is the height of CTL HEAD normal? No dust?Is there problem in CTL Inputcircuit and amplifier.YESNONONOIs there CTL pulse at IC501pin#97?Check IC501.Noise appears on the screen eventhough changing tape.Re-adjust the height of AC HEAD.Remove the dust.Check C510,R545R547IC 501 pin #91, 92, 98.NORe-adjust PATH.B-1. Bad playback quality (1)YESYESYESYESNoise appears on the Fullplayback screen.Are SW pulse and HA SW normal?Recheck step B-1(Bad playback quallty (1).Check HEAD AMP connector and HEAD.YESYESNONOENVE Wave at PT01 pin #4?Check VIDEO circuit.Are there SW, HA SW pulse atIC501 pin #16, 18?Check PCB Pattern.Check IC501.B-2. Bad playback quality (2)YESNOYES8TROUBLESHOOTINGNo broadcasting signalreceivedIs the output at IC501 pin# 61(CLK),60 (DATA) normal?Is SIF,Video output at TMI(RF101)pin#16,19 normal?Check IC 501.Check IC301.Check IC501.YESYESNONONOIs Video Signal input at IC501pin#50?Is there Video output at IC501pin#52?Check TMI (RF101) Block.NOCheck Video Buffer Q670, Q671 C. No broadcasting signal receivedYESYESYES9TROUBLESHOOTINGCassette tape isn t inserted.Is 5V voltage obtained at Loadingparts IC501 pin#2?Is 14V voltage obtained atCapstan Motor P501 pin#2?Check at EVER 14VCheck Q850.Connect Capstan and Loading Motor.Check connector and Capstan Motor.YESNONONOIs 13V voltage obtained at Eachparts of Loading Motor?Replace Loading Motor.Check D851 and POWER circuit.D. No CASSETTE LoadingYESYESE. AUTO STOP in Playback modeVCR stops automatically inplayback mode.Check R544,C516 and P501pin#11.Check S501, S502 REEL Sensor.Is D.PG/FG pulse at IC501pin#90 normal ?Is C. FG pulse at IC501 pin#87normal ?Is there REEL Pulse at IC501pin#79, 80?Check and replace IC501.NOYESYESYESNOCheck C.FG(R543,C517) andP501 pin#1.NO10TROUBLESHOOTINGF. DRUM Motor stopsG. CAPSTAN doesn t rotateCAPSTAN doesn t rotate.Is EVER 14V voltage obtained at P501 pin#2?YESNONONOYESYESIs Capstan PWM fit to IC501 pin#77?Is 3.2V voltage obtainedat P501 pin#5?Is 2.7V voltage obtained at P501 pin#9?Check P501 Connector andCapstan Motor.Check EVER 14V.(Q850)Check Capstan FG (IC 501 pin# 87).CheckR541,R540,R539,R538,C518Check R537,R536,C521DRUM Motor stops.Is 14V voltage obtained at P501pin#8?YESNONONOYESYESIs DRUM PWM fit to IC 501pin#76?Is 2.6V voltage obtained atP501 pin#12?Check Capstan Motor andDRUM Motor.Check EVER 14V (Q850).Check DRUM PG/FG(IC 501 pin# 90).Check R534,R535,C519,C520.NO11TROUBLESHOOTING3. VIDEO circuit A. EE screen doesn t appearEE MODE Picture NGIs Video signal input atIC301 pin#48,50,52,54?Is 5V supplied atpin#42,55,72,91of IC301?Is C.S, DATA, CLOCK signalinput pin#67,68,69 of IC301?Check IF and LINE IN JACK.Check POWER circuit.Check IC501pin #58,71,72.NOYESYESNONOYESIs signal output from pin#65 ofIC301?YESNOCheck IC301 pin#62 Q-V Sync.Is signal input into pin#50of IC501?YESNOCheck PCB Pattern.Is signal output frompin#52 of IC501?YESNOIs 5V supplied to pin#53, 98,99 of IC501?Is signal output at IC301pin#61?YESNOCheck PCB PatternQ309, Q310.Check IC 501 YESCheck POWER circuit.NOIs signal input at IC301pin#56?Check RF Output.Check PCB Pattern & LINEout.YESYESCheck IC301.NO12TROUBLESHOOTINGB. Playback picture doesn t appearYESYESIs Y SIGNAL output at IC301pin#46?Is VIDEO SIGNAL output at IC301pin#65?Check and Replace IC301.PB video signal missing.Is Envelope output from IC301pin#79?NONOSame as EE MODE check.Is 5V supplied at IC301 pin#91?Is SW Pulse input at IC301pin#70?Is 5V obtained at IC301 pin#24,42,55,72,91?Check POWER 5V.Check IC501 pin#18.Clean head or Replace head.Check POWER 5V.NONOCheck PATTERNNOYESYESYESYESYESYESNODoes X301(4.43MHz)oscillate?Is Y SIGNAL input at IC301pin#43?NOCheck PATTERNYESNOReplace X301.NOCheck and replace IC301.13TROUBLESHOOTINGIs +5V supplied at IC301 pin#91?NONOYESYESIs VIDEO SW Pulse input at IC301pin#70?Is REC signal output from IC301pin#94,95,89,90?LP MODE: 89,90 PinSP MODE: 94,95PinCheck video HEAD and Connector.Is signal input into IC301 pin# 48,50,52,54,56?Check POWER circuit.Check IC501 pin#18. Record video signal poor.Check EE MODE.YESIs luminance and color signaloutput from IC301 pin#78?Replace IC301.NONOYESC. No recordingYESIs IC301 pin#80 REC(H) HIGH?Check IC501 pin#45. NO14TROUBLESHOOTINGNOIs Video signal input at IC501pin#50?Check POWER circuit.No OSD appears.Is 5V obtained at IC501 pin# 53,98, 99?Is Video signal output at IC501pin#52?NOReplace IC501.D. No OSD(On Screen Display) appearsYESYESNOCheck IC 501.Check IC 501.NOCheck PCB PatternCheck FFC CABLE & DVDModuleDVD Composite signal doesn tappearIs signal output at PD01pin# 5?Is signal at IC301 pin#56? NOE. No DVD VideoYESYESRemark previous 3-AIs signal at IC301 pin#61? Check IC301NOCheck RF output.YESYESCheck Line output15TROUBLESHOOTING4. AUDIO (Hi-Fi MODEL)No sound in RF E-E modeIs Audio signal output at IC601 pin#3, 13?A. No sound in E-E modea. RF E-ECheck IC501.Is Audio signal output at IC251pin#16,17?Are CLK and DATA obtained atIC251 pin#42,43?NOIs 5V obtained at IC251 pin#40?Replace IC251.YESYESIs 12V obtained at IC251 pin#34?NOYESCheck POWER circuit.YESReplace IC601.Is 5V obtained at IC051 pin#1?Check Power circuit.NOIs there SIF signal at IC051 pin#2in RF mode?Check RF101.NOYESIs there SIF signal out at IC051pin#30, 31?Check IC051.NOYESYESComparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?NOCheck Output JACK.YESYESNO16TROUBLESHOOTINGb. AV1 E-ENo sound in AV1 E-E mode.NOCheck Input AV1 JACKIs Audio signal at IC251 pin#6, 7?Is Audio signal output at IC601 pin#3, 13?Check IC501.Is Audio signal output at IC251pin#16,17?Are CLK and DATA obtained atIC251 pin#42,43?NOIs 5V obtained at IC251 pin#40?Replace IC251.YESYESIs 12V obtained at IC251 pin#34?NOYESCheck POWER circuit.YESReplace IC601.YESComparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?NOCheck Output JACK.YESYESNO17TROUBLESHOOTINGc. AV2 E-ENo sound in AV2 E-E mode.NOCheck Input AV2 JACKIs Audio signal at IC251 pin#8, 9?Is Audio signal output at IC601 pin#3, 13?Check IC501.Is Audio signal output at IC251pin#19, 20?Are CLK and DATA obtained atIC251 pin#42,43?NOIs 5V obtained at IC251 pin#40?Replace IC251.YESYESIs 12V obtained at IC251 pin#34?NOYESCheck POWER circuit.YESReplace IC601.YESComparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?NOCheck Output JACK.YESYESNO18TROUBLESHOOTINGd. DVD E-ENo sound in DVD E-E mode.Is there DVD Audio at ICD01pin#7,8?Is 12V obtained at ICD03 pin#8?Is Audio(DVD) signal at IC601pin#2,15?YESYESCheck ICD03.NOCheck ICD01, DVD boardNOCheck POWER circuit.NOIs DVD Audio signaloutput atICD03 pin#1,7?Check ICD03.NOYESIs Audio signal output at IC601 pin#3, 13?Check IC501.YESReplace IC601.Comparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?NOCheck Output JACK.YESYESNO19TROUBLESHOOTINGIs Audio signal at IC601 pin#1,12?Check Input Front JACK.NOIs Audio signal output at IC601 pin#3, 13?Check IC501.YESReplace IC601.Comparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?NOCheck Output JACK.YESYESNOe. FRONT E-ENo sound in Front E-E mode.20B. No Hi-Fi Playback audio(PLAY MODE)NOCheck A.SW at IC501pin#19.Is Audio signal at IC251 pin#41?Is Audio signal output at IC601 pin#3, 13?Check IC501.Is Audio signal output at IC251pin#16,17?Are CLK and DATA obtained atIC251 pin#42,43?NOIs 5V obtained at IC251 pin#40?Replace IC251.YESYESIs 12V obtained at IC251 pin#34?NOYESCheck POWER circuit.YESReplace IC601.Comparing with switching table, are SWA, B CTL SIGNAL right at IC601 pin #9,10?NOCheck Output JACK.YESYESNO21C. No Hi-Fi playback in record/playback mode (REC MODE)Are there Audio signalat IC251 pin#49?Is FM OSC signal at IC251pin#36?Check input LINE1 JACK.Check input LINE2 JACK.Check ICD03(DVD).Replace DRUM.YESNONONOIs FM OSC signal at P401 pin#2?Replace IC251YESHEAD CLEANING.YESD. No NORMAL AUDIO playback (PLAY MODE)Is Playback Audio signal atIC301 pin#11?Replace IC251.YESNONOIs there Playback Normal Audiosignal at IC251 pin #17,18?Check A/C HEAD and IC301YESCheck Output JACK.YESIs there normal Audio signal atIC251 pin#17, 18?NOCheck power circuit.NOVoltage at IC251 pin#34 is 12V?Voltage at IC251 pin#40 and atIC301 pin#18 is 5V? 22TROUBLESHOOTINGE. No NORMAL AUDIO playback in record/playback mode(Check in REC mode)No Normal Audio playback inrecord/playback modeAre there Audio signal at IC251pin#49?Is there recording signal atIC251 pin#21?Check Input LINE1 JACK.Check Input LINE2 JACK.Check ICD03(DVD).Check signal flow circuit.YESNONONOSignal at IC251 pin#21 is transferred toIC301 pin#13,15,17?Collect signal at C222 is about70Vp-p at 70KHz? Check IC251.YESYESCheck Q203.NOCheck P201 pin#2, 4, 8 and A/CHEAD.YESREC (H) BASE voltage at Q206is 5V? Check IC501 pin#45.NOYES23WAVEFORMS1. VIDEO!(IC301-70) 5Vp-p1V/2msec/cmREC!(IC301-70)5Vp-p1V/2msec/cmPLAY(IC301-46) 520mVp-p200mV/5usec/cmREC(IC301-46) 520mVp-p200mV/5usec/cmPLAY#(IC301-43) 520mVp-p100mV/5usec REC#(IC301-43) 520mVp-p100mV/5usecPLAY$(IC301-21) 600mVp-p200mV/2msec/cmPLAY(SP) VIDEO SW TRIG$(IC301-21) 350mVp-p200mV/2msec/cmPLAY(EP) VIDEO SW TRIG% (IC301-67) 4.6Vp-p2V/10usec/cmREC/PLAY%(IC301-67) 4.6Vp-p2V/10usec/cmPICTURE SEARCH(IC301-65) 2.2Vp-p500mV/5usec/cmREC(IC301-65) 2.2Vp-p500mV/5usec/cmPLAY&(IC301-28) 450mVp-p200mV/0.1usec/cm24WAVEFORMS2. AUDIO2-1 AUDIO(Normal)2-2 AUDIO(Hi-Fi)*(IC301-15) 100mVp-p20mV/0.5msec/cmREC(IC301-11) 1.5Vp-p0.5V/0.5msec/cmREC)(IC301-100) 2.3Vp-p0.5V/0.5msec/cmREC1(IC301-8) 120mVp-p50mV/0.5msec/cmPLAY2(P202-2) 75Vp-p10V/20sec/cmREC3(IC251-2) 80mVp-p20mV/0.5msecEE/REC/PLAY4(IC251-24) 200mVp-p50mV/0.5msecEE/REC5(IC251-34) 1.4Vp-p0.5V/1msecREC6(IC251-32) 200mVp-p50mV/0.5msecEE/REC7(IC251-16) 1.4Vp-p0.5V/0.5msecEE/REC25WAVEFORMS3. SERVO/SYSCON8(IC501-18) 5Vp-p2V/5msec/cmREC/PLAY9 (IC501-77) 5Vp-p2V/5sec/cmREC/PLAY0 (IC501-76) 5Vp-p2V/5sec/cmREC/PLAY“(IC501-94) 3Vp-p1V/5msec/cmREC(IC501-97) 4.4Vp-p1V/5msec/cmPLAY+(IC501-90)25Vp-p&5Vp-p1V/5msec/cmREC/PLAY=(IC501-87) 2.5Vp-p1V/0.2msec/cmREC/PLAYQ(IC501-38) 2.6Vp-p0.5V/0.1sec/cmREC/PLAY26CIRCUIT DIAGRAM1. POWER SUPPLY CIRCUIT DIAGRAM27CIRCUIT DIAGRAM2. SERVO & SYSCON CIRCUIT DIAGRAM28CIRCUIT DIAGRAM3. VID