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日立CTP—236D型彩电采用自激调宽式开关稳压电源,较一般稳压电路复杂。一旦出现故障,检修较为困难。但只要按照合理的程序检修,便会化难为易。先检测开关管Q901集电极之前非稳压的直流电压。此段电压只会出现两种情况:1.Q901的c极电压为零:电压为零的原因是此段电路中F901、D901、R901、T901的初级线圈等元件断路所致。若F901熔断,原因多为C901、C906、C907、Q901短路所致;2.Q901的c极电压在250~300V之间,工
Hitachi CTP-236D-type TV with self-excited tone wide switching power supply, more complex than the normal voltage regulator circuit. In the event of failure, overhauling is more difficult. But as long as the maintenance in accordance with the reasonable procedures, it will be difficult for the easy. First test switch Q901 collector before the unregulated DC voltage. This section of the voltage will only appear in two cases: 1. Q901 c-pole voltage is zero: zero voltage is due to the circuit in the F901, D901, R901, T901 primary coil and other components due to circuit. If the F901 fuse, mostly due to C901, C906, C907, Q901 caused by short circuit; 2.Q901 c pole voltage between 250 ~ 300V, workers