论文部分内容阅读
[例1]百胜P-3500型卫星数字电视接收机,前面板无显示。故障分析:百胜P-3500型卫星数字电视接收机开关电源的前面板无显示,若保险丝不熔断,则应先查电阻RP8;若熔断,则应改用1W的金属膜电阻,在电阻正常时,再查ICP2。检查维修:查电阻RP8正常,测CP20端有300V直流电压,说明整流电路工作正常,再测ICP2(TDA4605)各引脚电压值,如表1所示。查ICP2各引脚外围元件,发现RPl7电阻开路。用240kΩ/2W电阻更换后,机器恢复正常。注意:在测ICP2各引脚电压前,应先检查PR8是
[Example 1] Yum P-3500 satellite digital TV receiver, the front panel without display. Failure Analysis: Yum P-3500 satellite digital television receiver switching power supply front panel no display, if the fuse is not blown, you should first check the resistance RP8; if blown, you should use 1W metal film resistors, the resistance is normal , Then check ICP2. Inspection and maintenance: check the resistance RP8 normal measured CP20 side has a 300V DC voltage, indicating rectification circuit is working properly, and then test ICP2 (TDA4605) pin voltage value, as shown in Table 1. ICP2 pin external components, found RPl7 resistance open. With 240kΩ / 2W resistance replacement, the machine returned to normal. Note: Before measuring ICP2 pin voltage, you should check PR8 first