BBK DK1020S - About Placement Position; Maintenance Method; Visualized Method; Electric Resistance Method

1.1.4Aboutplacementposition
1.2.1Visualizedmethod
1.2.2Electricresistancemethod
1.2.3Voltagemethod
1.2.4Currentmethod
1.2.5Cuttingmethod
1.NeverplaceDVDplayerinpositionswithhightemperatureandhumidity.
2.Avoidplacingnearhighmagneticfields,suchasloudspeakerormagnet.
3.Positionsforplacementshouldbestableandsecure.
Directlyviewwhetherabnormalitiesofcollision,lackofelement,jointwelding,sheddingwelding,
rosinjoint,copperfoilturningup,leadwiredisconnectionandelementsburningupamongpinsof
elementsappear.Checkpowersupplyofthemachineandthenusehandstotouchthecasingofpartof
elementsandcheckwhethertheyarehottojudgethetroublespot.Youshouldpaymoreattentionwhen
usingthismethodtocheckinhighvoltageparts.
Setthemultimeterinresistancepositionandtestwhetherthenumericalvalueofresistanceofeach
pointinthecircuithasdifferencefromthenormalvaluetojudgethetroublespot.Butinthecircuitthe
testednumericalvalueofresistanceisnotaccurate,andthetestednumericalvalueofintegratedIC's
pinscanonlybeusedforreference,sotheelementsshouldbebrokendownfortest.
Voltagemethodisrelativelyconvenient,quickandaccurate.Setthemultimeterinvoltageposition
andtestpowersupplyvoltageoftheplayerandvoltageofacertainpointtojudgethetroublespot
accordingtothetestedvoltagevariation.
Setthemultimeterincurrentpositionandtestcurrentoftheplayerofacertainpointtojudgethe
troublespot.Butwhentestingincurrentmethod,themultimetershouldbeseriesconnectedinthe
circuit,whichmakesthismethodtootrivialandtroublesome,soitislessfrequentlyusedinreality.
Cuttingmethodshouldbecombinedwithelectricresistancemethodandvoltagemethodtouse.
Thismethodismainlyusedinphenomenaofshortcircuitandcurrentleakageofthecircuit.
1.2Maintenancemethod
When
cuttingtheinputterminalvoltageofacertainlevel,ifvoltageoftheplayerrisesagain,itmeansthatthe
troubleliesinthislevel.
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