In the condition of open with a screwdriver closes the door switch and press play button, the laser radial movement is normal, with normal laser shot, but without focusing the search action. A closer examination reveals the objective lens is a little tilt, not in a horizontal position, a preliminary judge fault reason in laser. Remove the bald, remove the dust cap, with a pointer multimeter R x 1 block measurement on printing plate on the right side of the two bald spot, around eight Ω resistance, and objective when measuring horizontal swing, explain basic normal tracking coils; To measure small printing plate on the left side of the two solder joints, resistance to infinity, and did not found during the measurement objective action (obviously not normal, normal is measured between two points is about 16 Ω resistance, and can see objective in vertical direction). Proving focusing coil has been open, direct measurement of focusing coil terminal resistance between two solder joint is about 16 Ω, coil terminal and printing plate connecting line between the open circuit point. Through the observation, found that focusing coil terminal and printed circuit board is used to connect two thin wires, fine steel wire as both wires, and as a supporting institution of the objective lens. Tested and found one of coerce fine steel wire and the solder joints on the printing plate has to take off the welding, because the wire welding, make the steel wire longer than the other three root, cause lens tilt, cannot keep in a horizontal position and cause failure. Will be fixed in a horizontal position of the objective after welding wire, back into baldheaded of commissioning, troubleshooting.rrXservice manual download site