LG troubleshooting free download

File name troubleshooting.pdf

TCH-300 TROUBLESHOOTING c CD Function CD PART Select NO Is power turned ON? m Check power supply circuitry. I YES I 1 .- . - NO Does initial reading occur? w Check laser circuitry. I . YES + Check focusing circuitry. w Check disc. $ - NO Can disc be played? w Check tracking servo circuitry. . YES NO Is audio output supplied? Check Audio circuitry. YES I OK - 27 - TCH-300 (1) If display LCD lighting is not normal I CD Function Select I (WITHOUT DISC) NO Check voltage in the power Do display LCD then light? * supply circuitry. I YES 1 Is u-COM IC401 reset circuit Reset circuit defective. normal? Pin @ NO Surrounding circuit defec- tive. YES I Is u-COM IC401 C.L.K terminal Pin @ (OSC) NO C405, C406 defective. input? X401 defective. about 0.25ysec w YES I