论文部分内容阅读
1.夏普XV—100型投影机故障现象:开机后灯光不亮,整机不工作。检修:(1)查电源电路,测C7002端电压为零,查IC7001(MA1050)内部损坏、F7001断路。更换IC7001、F7001后故障排除。 (2)开机检查电源电路,发现启动电阻R1开路。更换R1后故障排除。 (3)开机检查电源电路,发现C7002滤波电容击穿。更换C7002后故障排除。故障现象:开机不久即自动停机,故障反复出现。检修:开机检查测温电路,测IC3002控制电压为0.7 V(正常应为1.3 V),查测温电路失调。将R3018改为 10 kΩ,R3039改用22 kΩ,并重调IC3002控制电压为1.3V后,故障排除。故障现象:开机后指示红灯亮,但整机不工作。检修:(1)开机检查微处理器控制电路,发现
Sharp XV-100 Projector Symptom: After the light is off, the machine does not work. Overhaul: (1) Check the power circuit, measuring C7002 terminal voltage is zero, check IC7001 (MA1050) internal damage, F7001 open circuit. Replace IC7001, F7001 after troubleshooting. (2) Check the power circuit boot, found that the start-up resistor R1 open. Replacing R1 troubleshooting. (3) Check the power circuit boot and found breakdown breakdown C7002 filter capacitor. After replacing C7002 troubleshooting. Symptom: Automatically shut down shortly after power on, the fault appears repeatedly. Maintenance: boot check temperature measurement circuit, IC3002 test control voltage of 0.7 V (normal should be 1.3 V), check the temperature circuit disorders. Change R3018 to 10 kΩ, R3039 to 22 kΩ, and reset IC3002 control voltage to 1.3V after troubleshooting. Symptom: After the boot instructions red light, but the machine does not work. Overhaul: (1) Check the microprocessor control circuit boot, found