The machine for counterfeit spell power, models for samsung V803ST motherboard. Observe tray in and out of the in and out of box fast running speed, laser lens focusing range is too large, up and down into the disc to hear the sound from the objective impact discs. wDcservice manual download site
The above phenomenon description load motor and focus on driving voltage of the circuit is too high, also suggests that the power supply voltage is likely to be too high. Measuring the mainboard CN13 + 8 v voltage of up to 12 v socket. + 8 v voltage is fixed on the metal base of three-terminal voltage regulator block LM7808 provide, after the analysis of voltage stability voltage rise of two possible reasons: one is LM7808 input and output terminal short circuit; The second is grounding feet open circuit. Examination revealed LM7808 {2} feet (ground) has JiGen broken, because LM7808 heat metal parts and {2} feet are interlinked, and fixed on the chassis metal base (base), should be regulated properly, but measuring LM7808 metal parts and chassis, get off after LM7808, only to find that the installation of the spray paint not scrape, after the painting here scrape, back LM7808, + 8 v voltage of returned to normal, in order to avoid poor contact occur again in the future, change new voltage regulator block, and will lead soldering on the pin directly. Electricity of commissioning, troubleshooting.wDcservice manual download site