| 经测量，整机高压供电电路c2对地电压为+305V，正常；低压供电电路调整三极管Q5发射极对地电压为+18V，正常；电解电容器Ec2对地电压为+5v，正常。用R×100挡检查主电路板排风扇驱动电路，发现贴片电阻R49脱焊受损，重焊R49后，整机恢复正常。 |
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