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实例14:一台Canon(佳能)FAX-L770型传真机,开机后,LCD无显示,按键操作不起作用。分析与检修:该故障现象说明操作显示面板上无+5V电压。先用万用表测量主控板上连接器J17的(A1)脚的对地(A2脚)电压,测得电压为0V,即主控板上也无+5V电压,而主控板上的+5V电压由低电压电源提供。首先测量连接器PNl的①脚的对地③脚电压,测得电压为0V。接着测量PNl的②～⑥脚和⑤脚(地)之间的电压(+12V)、PNl的③脚(24V)和①脚(地)之间的电压,经测量这两路电压也为0V。由于这三康佳SP29TM529型CRT彩色电视机电路原理图(14/16)
Example 14: A Canon FAX-L770 fax machine, the boot, the LCD no display, the key operation does not work. Analysis and Overhaul: This symptom shows no + 5V on the operator display panel. First, measure the voltage of the ground (A2 pin) of the connector (A1) of the connector J17 on the main control board with a multimeter and measure the voltage as 0V, that is, there is no + 5V voltage on the main control board, and the + 5V The voltage is provided by the low voltage power supply. First of all, measure the voltage of the pin ③ of the connector PN1 to pin ③, and measure the voltage as 0V. Then measure the PN1 ② ~ ⑥ feet and ⑤ feet (ground) between the voltage (+12 V), PNl’s feet (24V) and ① feet (ground) between the voltage measured by the two voltage is 0V . As the three Konka SP29TM529 CRT color TV circuit diagram (14/16)