测整机高压供电电路C4对地电压为+305V。正常;测低压供电电路EC1对地+18V电压,正常。测U1稳压器(LM7805)输出端对地+5V电压。正常。测同步电压比较电路取样电阻R36、R37对地均为负压。用R×1130挡测。发现电感L1脱焊,重焊L1后整机恢复正常。 |
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