LG-DP270B-dvd-sm 维修电路原理图.pdf
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1、PORTABLE DVDSERVICE MANUALMODEL : DP270BCAUTIONBEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”IN THIS MANUAL.MODEL : DP270BSERVICE MANUALP/NO : AFN33673353 APRIL, 2007http:/Av. Sor Juana lns de la Cruz No 555Col. San LorenzoTlalnepantla, Estado de Mxico CP 54033Tel. 321 19 00 Fax. 5 657549L
2、ada sin costo 01 800 50 481 00RadioFans.CN 收音机爱 好者资料库CONTENTSSECTION 1.SUMMARYSECTION 2.EXPLODED VIEWSSECTION 3.ELECTRICALSECTION 4.REPLACEMENT PARTS LISTRadioFans.CN 收音机爱 好者资料库1-2SECTION 1SUMMARYCONTENTSPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.1-3SERVICING PRECAUTIONS.1-4 GENERAL SERV
3、ICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE (ES) DEVICESSPECIFICATIONS.1-51-3PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTSIMPORTANT SAFETYNOTICEThis manual was prepared for use only by properly trained audio-video servicetechnicians.When servicing this produc
4、t, under no circumstances should the original design bemodified or altered without permission from LG Corporation. All components shouldbe replaced only with types identical to those in the original circuit and their physicallocation, wiring and lead dress must conform to original layout upon comple
5、tion ofrepairs.Special components are also used to prevent x-radiation, shock and fire hazard.These components are indicated by the letter “x” included in their componentdesignators and are required to maintain safe performance. No deviations areallowed without prior approval by LG Corporation.Circu
6、it diagrams may occasionally differ from the actual circuit used. This way,implementation of the latest safety and performance improvement changes into theset is not delayed until the new service literature is printed.CAUTION: Do not attempt to modify this product in any way. Never performcustomized
7、 installations without manufacturers approval. Unauthorizedmodifications will not only void the warranty, but may lead to property damage or userinjury.Service work should be performed only after you are thoroughly familiar with thesesafety checks and servicing guidelines.GRAPHIC SYMBOLSThe exclamat
8、ion point within an equilateral triangle is intended to alertthe service personnel to important safety information in the serviceliterature.The lightning flash with arrowhead symbol within an equilateraltriangle is intended to alert the service personnel to the presence ofnoninsulated “dangerous vol
9、tage” that may be of sufficient magnitudeto constitute a risk of electric shock.The pictorial representation of a fuse and its rating within an equilateraltriangle is intended to convey to the service personnel the followingfuse replacement caution notice:CAUTION : FOR CONTINUED PROTECTION AGAINST R
10、ISK OFFIRE, REPLACE ALL FUSES WITH THE SAME TYPE ANDRATING AS MARKED NEAR EACH FUSE.SERVICE INFORMATIONWhile servicing, use an isolation transformer for protection from AC line shock. Afterthe original service problem has been corrected, make a check of the following:FIRE AND SHOCK HAZARD1. Be sure
11、that all components are positioned to avoid a possibility of adjacentcomponent shorts. This is especially important on items trans-ported to and fromthe repair shop.2. Verify that all protective devices such as insulators, barriers, covers, shields, strainreliefs, power supply cords, and other hardw
12、are have been reinstalled per theoriginal design. Be sure that the safety purpose of the polarized line plug has notbeen defeated.3. Soldering must be inspected to discover possible cold solder joints, soldersplashes, or sharp solder points. Be certain to remove all loose foreign particles.4. Check
13、for physical evidence of damage or deterioration to parts and components,for frayed leads or damaged insulation (including the AC cord), and replace ifnecessary.5. No lead or component should touch a high current device or a resistor rated at 1watt or more. Lead tension around protruding metal surfa
14、ces must be avoided.6. After reassembly of the set, always perform an AC leakage test on all exposedmetallic parts of the cabinet (the channel selector knobs, antenna terminals,handle and screws) to be sure that set is safe to operate without danger ofelectrical shock. DO NOT USE ALINE ISOLATION TRA
15、NSFORMER DURINGTHIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivityin the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15mfd 150V AC type capacitor between a known good earth ground water pipe,conduit, etc.) and the exposed metallic parts, one at a
16、 time. Measure the ACvoltage across the combination of 1500 ohm resistor and .15 mfd capacitor.Reverse the AC plug by using a non-polarized adaptor and repeat AC voltagemeasurements for each exposed metallic part. Voltage measured must notexceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. A
17、ny valueexceeding this limit constitutes a potential shock hazard and must be correctedimmediately.TIPS ON PROPER INSTALLATION1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelfspace over, or close to, a heat duct, or in the path of heated air flow. 2. Avoid cond
18、itions of high humidity such as: outdoor patio installations where dewis a factor, near steam radiators where steam leakage is a factor, etc. 3. Avoid placement where draperies may obstruct venting. The customer should alsoavoid the use of decorative scarves or other coverings that might obstructven
19、tilation.4. Wall- and shelf-mounted installations using a commercial mounting kit must followthe factory-approved mounting instructions. A product mounted to a shelf orplatform must retain its original feet (or the equivalent thickness in spacers) toprovide adequate air flow across the bottom. Bolts
20、 or screws used for fastenersmust not touch any parts or wiring. Perform leakage tests on customizedinstallations.5. Caution customers against mounting a product on a sloping shelf or in a tiltedposition, unless the receiver is properly secured.6. Aproduct on a roll-about cart should be stable in it
21、s mounting to the cart.Caution the customer on the hazards of trying to roll a cart with small castersacross thresholds or deep pile carpets.7. Caution customers against using extension cords. Explain that a forest ofextensions, sprouting from a single outlet, can lead to disastrous consequences toh
22、ome and family.1-4SERVICING PRECAUTIONSCAUTION: Before servicing the PORTABLE DVD coveredby this service data and its supplements and addends, readand follow the SAFETYPRECAUTIONS. NOTE: ifunforeseen circumstances create conflict between thefollowing servicing precautions and any of the safetyprecau
23、tions in this publications, always follow the safetyprecautions.Remember Safety First :General Servicing Precautions1.Always unplug the PORTABLE DVD AC power cord fromthe AC power source before:(1) Removing or reinstalling any component, circuit board,module, or any other assembly.(2) Disconnecting
24、or reconnecting any internal electricalplug or other electrical connection.(3) Connecting a test substitute in parallel with anelectrolytic capacitor.Caution : A wrong part substitution or incorrect polarityinstallation of electrolytic capacitors may result in anexplosion hazard.2.Do not spray chemi
25、cals on or near this PORTABLE DVDor any of its assemblies.3.Unless specified otherwise in this service data, cleanelectrical contacts by applying an appropriate contactcleaning solution to the contacts with a pipe cleaner,cotton-tipped swab, or comparable soft applicator. Unless specified otherwise
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