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例1 机型:xian sheng(先声)520型VCD机故障现象:按下“POWER”电源开关键,显示屏亮,电源接通红色指示灯不亮,面板、遥控操作全部失控。分析与检修:该机是TAK—888型伺服主板拼装机。面板、遥控操作过程基本相同:由面板内IC1(AP6321—0001—S)编码、控制→发射→接收→主板CW115②脚→CW117①脚→华邦W9925解压板CN2→CW117②脚→VI(DTVS888)(24)脚(REM)。详见图1所示。检修时,测量CW115③脚有5 V电压,正
Example 1 Model: xian sheng (first sound) 520 VCD VCD Symptom: Press the “POWER” power button, the display is bright, the power is on red light does not shine, the panel, remote control all out of control. Analysis and maintenance: This machine is TAK-888 servo motherboard assembly machine. Panel, remote control operation process is basically the same: the code from the panel IC1 (AP6321-0001-S), control → launch → receive → motherboard CW115 ② feet → CW117 ① feet → Winbond W9925 decompression board CN2 → CW117 ② feet → VI (DTVS888) (24 Foot (REM). See Figure 1 for details. Overhaul, measure CW115 ③ foot 5 V voltage, positive