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故障现象:开机“三无”。分析检修:该机采用A3电源,设有110V/220V倍压整流自动切换电路IC701(STR83145),CPU/IC1001(IX2759CE/M37221M4),中放、行场扫描、解码电路IC801(M52340)单片机心。根据该机故障现象,首先检测了行输出管Q601、电源开关管Q703和110V/220V切换电路IC701等,
Symptom: boot “three no.” Analysis and maintenance: The aircraft uses A3 power supply, with 110V / 220V voltage doubler rectifier automatic switching circuit IC701 (STR83145), CPU / IC1001 (IX2759CE / M37221M4), put in, field scanning, decoding circuit IC801 (M52340) According to the machine fault phenomenon, first detected the line output tube Q601, the power switch Q703 and 110V / 220V switching circuit IC701, etc.,