Lg dvx 9900 service manual
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Extracted text from lg dvx 9900 service manual (Ocr-read)
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SECT\bON 1SU\f\fARY CONTENTS PRODUCT SAFETY SERV\bC\bNG GU\bDEL\bNES FOR V\bDEO PRODUCTS ........................... 1-3 SERV\bC\bNG PRECAUT\bONS ....................................\A....................................\A.......................... 1-4 - General Servicing Precautions - \bnsulation Checking Prodedure - Electrostatically Sensitive Devices SPEC\bF\bCAT\bONS ....................................\A....................................\A....................................\A.......... 1-5 1-2 Downloaded Free from http://www.free-service-manuals.com
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1-3 CAUTIO\b : DO \bOT ATTE\fPT TO \fODIFY THIS PRODUCT I\b A\bY WAY, \bEVER PERFOR\f CUSTO\fIZED I\bSTALLATIO\bS WITHOUT \fA\bUFAC- TURERS APPROVAL. U\bAUTHORIZED \fODIFICATIO\bS WILL \bOT O\bLY VOID THE WARRA\bTY, BUT \fAY LEAD TO YOUR BEI\bG LIABLE FOR A\bY RESULTI\bG PROPERTY DA\fAGE OR USER I\bJURY. SERVICE WORK SHOULD BE PERFOR\fED O\bLY AFTER YOU ARE THOROUGHLY FA\fILIAR WITH ALL OF THE FOLLOWI\bG SAFETY CHECKS A\bD SERVICI\bG GUIDELI\bES. TO DO OTHERWISE, I\bCREASES THE RISK OF POTE\bTIAL HAZARDS A\bD I\bJURY TO THE USER. WHILE SERVICI\bG, USE A\b ISOLATIO\b TRA\bSFOR\fER FOR PROTEC- TIO\b FRO\f A.C. LI\bE SHOCK. SAFETY CHECKS AFTER THE ORIGI\bAL SERVICE PROBLE\f HAS BEE\b CORRCTED. A CHECK SHOULD BE \fADE OF THE FOLLOWI\bG. SUBJECT : F\bRE & SHOCK HAZARD 1. BE SURE THAT ALL CO\fPO\bE\bTS ARE POSITIO\bED I\b SUCH A WAYAS TO AVOID POSSIBILITY OF ADJACE\bT CO\fPO\bE\bT SHORTS. THIS IS ESPECIALLY I\fPORTA\bT O\b THOSE \fODULES WHICH ARE TRA\bSPORTED TO A\bD FRO\f THE REPAIR SHOP. 2. \bEVER RELEASE A REPAIR U\bLESS ALL PROTECTIVE DEVICES SUCH AS I\bSULATORS, BARRIERS, COVERS, SHIELDS, STRAI\b RELIEFS, POWER SUPPLY CORDS, A\bD OTHER HARDWARE HAVE BEE\b REI\bSTALLED PER ORIGI\bAL DESIG\b. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LI\bE PLUG HAS \bOT BEE\b DEFEATED. 3. SOLDERI\bG \fUST BE I\bSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOI\bTS, SOLDER SPLASHES OR SHARP SOLDER POI\bTS. BE CERTAI\b TO RE\fOVE ALL LOOSE FOREIG\b PARTICLES. 4. CHECK FOR PHYSICAL EVIDE\bCE OF DA\fAGE OR DETERIORATIO\b TO PARTS A\bD CO\fPO\bE\bTS. FOR FRAYED LEADS, DA\fAGED I\bSULATIO\b (I\bCLUDI\bG A.C. CORD). A\bD REPLACE IF \bECESSARY FOLLOW ORIGI\bAL LAYOUT, LEAD LE\bGTH A\bD DRESS. 5. \bO LEAD OR CO\fPO\bE\bT SHOULD TOUCH A RECIVI\bG TUBE OR A RESISTOR RATED AT 1 WATT OR \fORE. LEAD TE\bSIO\b AROU\bD PROTRU\bI\bG \fETAL SURFACES \fUST BE AVOIDED. 6. ALL CRITICAL CO\fPO\bE\bTS SUCH AS FUSES, FLA\fEPROOF RESISTORS, CAPACITORS, ETC. \fUST BE REPLACED WITH EXACT FACTORY TYPES, DO \bOT USE REPLACE\fE\bT CO\fPO\bE\bTS OTHER THA\b THOSE SPECIFIED OR \fAKE U\bRECO\f\fE\bDED CIR- CUIT \fODIFICATIO\bS. 7. AFTER RE-ASSE\fBLY OF THE SET ALWAYS PERFOR\f A\b A.C. LEAKAGE TEST O\b ALL EXPOSED \fETALLIC PARTS OF THE CABI- \bET, (THE CHA\b\bEL SELECTOR K\bOB, A\bTE\b\bA TER\fI\bALS. HA\b- DLE A\bD SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DA\bGER OF ELECTRICAL SHOCK. DO \bOT USE A LI\bE ISOLATIO\b TRA\bSFOR\fER DURI\bG THIS TEST USE A\b A.C. VOLT- \fETER, HAVI\bG 5000 OH\fS PER VOLT OR \fORE SE\bSITIVITY, I\b THE FOLLOWI\bG \fA\b\bER; CO\b\bECT A 1500 OH\f 10 WATT RESIS- TOR, PARALLELED BY A .15 \fFD. 150.V A.C TYPE CAPACITOR BETWEE\b A K\bOW\b GOOD EARTH GROU\bD (WATER PIPE, CO\b- DUIT, ETC.) A\bD THE EXPOSED \fETALLIC PARTS, O\bE AT A TI\fE. \fEASURE THE A.C. VOLTAGE ACROSS THE CO\fBI\bATIO\b OF 1500 OH\f RESISTOR A\bD .15 \fFD CAPACITOR. REVERSE THE A.C. PLUG A\bD REPEAT A.C. VOLTAGE \fEASURE\fE\bTS FOR EACH EXPOSED \fETALLIC PART. VOLTAGE \fEASURED \fUST \bOT EXCEED 75 VOLTS R.\f.S. THIS CORRESPO\bDS TO 0.5 \fILLIA\fP A.C A\bY VALUE EXCEEDI\bG THIS LI\fIT CO\bSTITUTES A POTE\bTIAL SHOCK HAZARD A\bD \fUST BE CORRECTED I\f\fEDIATELY. SUBJECT: GRAPH\bC SY\fBOLS THE LIGHT\bI\bG FLASH WITH APROWHEAD SY\fBOL. WITHI\b A\b EQUILATERAL TRIA\bGLE, IS I\bTE\bDED TO ALERT THE SERVICE PERSO\b\bEL TO THE PRESE\bCE OF U\bI\bSULATED DA\bGEROUS VOLTAGE THAT \fAY BE OF SUFFICIE\bT \fAG- \bITUDE TO CO\bSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLA\fATIO\b POI\bT WITHI\b A\b EQUILATERAL TRIA\b- GLE IS I\bTE\bDED TO ALERT THE SERVICE PERSO\b\bEL TO THE PRESE\bCE OF I\fPORTA\bT SAFETY I\bFOR\fATIO\b I\b SERVICE LITERATURE. SUBJECT : X-RADIATIO\b 1. BE SURE PROCEDURES A\bD I\bSTRUCTIO\bS TO ALL SERVICE PER- SO\b\bEL COVER THE SUBJECT OF X-RADIATIO\b. THE O\bLY POTE\b- TIAL SOURCE OF X-RAYS I\b CURRE\bT T.V. RECEIVERS IS THE PIC- TURE TUBE. HOWEVER, THIS TUBE DOES \bOT E\fIT X-RAYS WHE\b THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVE\b I\b THE APPLICABLE SCHE\fATIC. OPERA- TIO\b AT HIGHER VOLTAGES \fAY CAUSE A FAILURE OF THE PIC- TURE TUBE OR HIGH VOLTAGE SUPPLY A\bD, U\bDER CERTAI\b CIR- CU\fSTA\bCES, \fAY PRODUCE RADIATIO\b I\b EXCESS OF DESIR- ABLE LEVELS. 2. O\bLY FACTORY SPECIFIED C.R.T. A\bODE CO\b\bECTORS \fUST BE USED. DEGAUSSI\bG SHIELDS ALSO SERVE AS X-RAY SHIELD I\b COLOR SETS, ALWAYS RE-I\bSTALL THE\f. 3. IT IS ESS\bTIAL THAT SERVICE PERSO\b\bEL HAVE AVAILABLE A\b ACCURATE A\bD RELIABLE HIGH VOLTAGE \fETER. THE CALIBRA TIO\b OF THE \fETER SHOULD BE CHECKED PERIODICALLY AGAI\bST A REFERE\bCE STA\bDARD, SUCH AS THE O\bE AVAILABLE AT YOUR DISTRIBUTOR. 4. WHE\b THE HIGH VOLTAGE CIRCUITRY IS OPERATI\bG PROPERLY THERE IS \bO POSSIBILITY OF A\b X-RADIATIO\b PROBLE\f. EVERY TI\fE A COLOR CHASSIS IS SERVICED. THE BRIGHT\bESS SHOULD BE RU\b UP A\bD DOW\b WHILE \fO\bITORI\bG THE HIGH VOLTAGE WITH A \fETER TO BE CERTAI\b THAT THE HIGH VOLTAGE DOES \bOT EXCEED THE SPECIFIED VALUE A\bD THAT IT IS REGULATI\bG CORRECTLY, WE SUGGEST THAT YOU A\bD YOUR SERVICE ORGA- \bIZATIO\b REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU- LATIO\b IS ALWAYS CHECKED AS A STA\bDARD SERVICI\bG PROCE- DURE. A\bD THAT THE HIGH VOLTAGE READI\bG BE RECORDER O\b EACH CUSTO\fERS I\bVOICE. 5. WHE\b TROUBLESHOOTI\bG A\bD \fAKI\bG TEST \fEASURE\fE\bTS I\b A PRODUCT WITH A PROBLE\f OF EXCESSIVE HIGH VOLTAGE, AVOID BEI\bG U\b\bECESSARILY CLOSE TO THE PICTURE TUBE A\bD THE HIGH VOLTAGE SUPPLY. DO \bOT OPERATE THE PRODUCT LO\bGER THA\b IS \bECESSARY TO LOCATE THE CAUSE OF EXCES SIVE VOLTAGE. 6. REFER TO HV. B+ A\bD SHUTDOW\b ADJUST\fE\bT PROCEDURES DESCRIBED I\b THE APPROPRIATE SCHE\fATIC A\bD DIAGRA\fS (WHERE USED). SUBJECT: I\fPLOSIO\b 1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH A\b I\bTE GRAL I\fPLOSIO\b PROTECTIO\b SYSTE\f, BUT CARE SHOULD BE TAKE\b TO AVOID DA\fAGE DURI\bG I\bSTALLATIO\b, AVOID SCRATCHI\bG THE TUBE. IF SCRATCHED REPLACE IT. 2. USE O\bLY RECO\f\fE\bDED FACTORY REPLACE\fE\bT TUBES. SUBJECT : TIPS O\b PROPER I\bSTALLATIO\b 1. \bEVER I\bSTALL A\bY PRODUCT I\b A CLOSED-I\b RECESS, CUBBY- HOLE OR CLOSELY FITTI\bG SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR I\b THE PATH OF HEATED AIR FLOW. 2. AVOID CO\bDITIO\bS OF HIGH HU\fIDITY SUCH AS: OUTDOOR PATIO I\bSTALLATIO\bS WHERE DEW IS A FACTOR, \bEAR STEA\f RADIA- TORS WHERE STEA\f LEAKAGE IS A FACTOR, ETC. 3. AVOID PALCE\fE\bT WHERE DRAPERIES \fAY OBSTRUCT REAR VE\bTI\bG. THE CUSTO\fER SHOULD ALSO AVOID THE USE OF DEC- ORATIVE SCARVES OR OTHER COVERI\bGS WHICH \fIGHT OBSTRUCT VE\bTILATIO\b. 4. WALL A\bD SHELF \fOU\bTED I\bSTALLATIO\bS USI\bG A CO\f\fER- CIAL \fOU\bTI\bG KIT. \fUST FOLLOW THE FACTORY APPROVED \fOU\bTI\bG I\bSTRUCTIO\bS A PRODUCT \fOU\bTED TO A SHELF OR PLATFOR\f \fUST RETAI\b ITS ORIGI\bAL FEET (OR THE EQUIVALE\bT THICK\bESS I\b SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTO\f, BOLTS OR SCREWS USED FOR FASTE\bERS \fUST \bOT TOUCH A\bY PARTS OR WIRI\bG. PERFOR\f LEAKAGE TEST O\b CUSTO\fIZED I\bSTALLATIO\bS. 5. CAUTIO\b CUSTO\fERS AGAI\bST THE \fOU\bTI\bG OF A PRODUCT O\b SLOPI\bG SHELF OR A TILTED POSITIO\b, U\bLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT O\b A ROLL-ABOUT CART SHOULD BE STABLE O\b ITS \fOU\bTI\bG TO THE CART. CAUTIO\b THE CUSTO\fER O\b THE HAZ- ARDS OF TRYI\bG TO ROLL A CART WITH S\fALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTIO\b CUSTO\fERS AGAI\bST THE USE OF A CART OR STA\bD WHICH HAS \bOT BEE\b LISTED BY U\bDERWRITERS LABORATORIES, I\bC. FOR USE WITH THEIR SPECIFIC \fODEL OF TELEVISIO\b RECEIVER OR GE\bERICALLY APPROVED FOR USE WITH T.V.S OF THE SA\fE OR LARGER SCREE\b SIZE. 8. CAUTIO\b CUSTO\fERS AGAI\bST THE USE OF EXTE\bSIO\b CORDS, EXPLAI\b THAT A FOREST OF EXTE\bSIO\bS SPROUTI\bG FRO\f A SI\b- GLE OUTLET CA\b LEAD TO DISASTROUS CO\bSEQUE\bCES TO HO\fE A\bD FA\fILY. PRODUCT SAFETY SERV\bC\bNG GU\bDEL\bNES FOR V\bDEO PRODUCTS A.C. VOLT\fETER GOOD EARTH GROU\bD SUCH AS THE WATER PIPE. CO\bDUIT. ETC PLACE THIS PROBE O\b EACH EXPOSED \fETAL PART Downloaded Free from http://www.free-service-manuals.com