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故障现象 四台Amstrad卫星接收机通电后,显示屏无任何显示。按下机器的待机开关,显示屏仍无任何显示。 分析与检修 因通电后机内无任何反应,故怀疑开关电源有故障。开关电源电原理图如附图所示,系笔者根据实物测绘。 检查第一台卫星接收机时,发现该机的R602(100k,1/2W)断路。换上新电阻后该机恢复正常。检查第二台卫星接收机时发现也是R602断路,但换上新电阻后,测IC600的⑦脚无11.4V电压。检查发现IC600的⑦脚与⑤脚短路,故判定集成电路损坏。更换IC600后,该机恢复正常。第三台和第四台卫星接收机的故障均是因电源开关管F10084击穿、R604
Symptom Four Amstrad satellite receiver power, the display without any display. Press the machine’s standby switch, the display still does not show anything. Analysis and maintenance due to power after the machine without any response, it is suspected switch power failure. Switching power supply schematic diagram shown in the figure, the author based on physical mapping. Check the first satellite receiver, found the machine’s R602 (100k, 1 / 2W) open circuit. After replacing the new resistance machine back to normal. Check the second satellite receiver is also found R602 open circuit, but put on a new resistance, the test IC600 ⑦ feet without 11.4V voltage. IC600 inspection found ⑦ feet and ⑤ pin short circuit, it is determined that the integrated circuit is damaged. After replacing IC600, the aircraft returned to normal. The third and fourth satellite receiver failures are due to the power switch tube F10084 breakdown, R604