【故障现象】无论放入CD或VCD碟片,光头有聚焦动作,但不读碟,荧光屏显示“--”,主轴电机不转。【检修过程】该机曾在两年前加装了VCD解码板。但近期出现了读碟时间长,有时甚至出现检索不到碟片的故障。机主说,曾打开机器,自行调整过光头和CD板上的电位器,偶尔也能读碟,但放VCD碟时,马赛克现象严重。 【Symptom】 No matter put into CD or VCD disc, the bald has focusing action, but does not read the disc, the phosphor screen shows “-”, the spindle motor does not turn. 【Maintenance process】 The machine was installed two years ago VCD decoder board. However, recently there has been a long time to read a disc, and sometimes a disc failure can not be retrieved. The owner said that he had to turn on the machine and adjust the potentiometer on the optical head and the CD board himself, occasionally reading the disc.