BBK DK1020S, Service Manual

Page: 8 / 177

1.1.4Aboutplacementposition
1.2.1Visualizedmethod
1.2.2Electricresistancemethod
1.2.3Voltage method
1.2.4Currentmethod
1.2.5Cuttingmethod
1.NeverplaceDVDplayerinpositionswithhightemperatureandhumidity.
2.Avoidplacingnearhighmagneticfields,suchasloudspeakerormagnet.
3.Positionsforplacementshouldbe stable andsecure.
Directlyviewwhether abnormalities ofcollision, lack of element,jointwelding, shedding welding,
rosin joint, copper foil turning up, lead wiredisconnection and elements burning u p among pins of
elementsappear.Checkpowersupplyofthemachineandthenusehandstotouchthecasingofpartof
elementsandcheckwhetherthey arehottojudgethetroublespot.Youshouldpaymoreattention when
usingthismethodtocheckinhighvoltageparts.
Set themultimeterinresistancepositionandtest whetherthenumericalvalueofresistanceof each
pointin the circuithasdifference from thenormal value to judgethetroublespot. But in the circuitthe
testednumerical value of resistanceisnotaccurate, andthetestednumerical value ofintegrated IC's
pinscanonlybeusedforreference,sotheelementsshouldbebrokendownfortest.
Voltagemethod is relativelyconvenient,quickandaccurate. Setthemultimeterinvoltageposition
and test power supply voltage of the player and voltage o f a certain point to judge the trouble spot
accordingtothetestedvoltagevariation.
Set themultimeterincurrent position a n d t e s t c u r r e n t of the player o f a c e r t a i n point t o j u d g e t h e
trouble spot. But when testing in current method, the multimeter should be series connected in the
circuit,whichmakesthismethodtootrivialandtroublesome, soitislessfrequentlyusedinreality.
Cuttingmethod should becombinedwith electric resistance method a n d voltagemethod to use.
This method is mainly used in phenomena of short circuit and current leakage of the circuit.
1.2 Maintenance m ethod
When
cuttingtheinputterminalvoltageofacertainlevel,if voltage ofthe playerrisesagain,itmeansthatthe
troubleliesinthislevel.
- 2 -