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(2)检查保险丝F402已经熔断。一般来说,F402熔断就意味着该支路有短路现象或因某个器件损坏导致负载电流过大烧坏保险丝。静态时检查Q403、C434、D414元件均无短路,更换保险丝F402后通电,发现输出端仍无5V电压,于是估计控制电路IC402损坏。更换IC402后,通电试机,LED显示正常,故障排除。实例6:一台Panasonic(松下)KX-F90B型传真机,通电开机后,LCD无显示,机器无任何动静。
(2) Check the fuse F402 has blown. In general, F402 blow means that the branch has a short circuit or because of a device damage caused by excessive load current burned fuse. Static state inspection Q403, C434, D414 components are no short circuit, replace the fuse F402 power and found that the output voltage is still 5V, so it is estimated that the control circuit IC402 damage. Replace IC402, power test machine, LED display is normal, troubleshooting. Example 6: A Panasonic (Panasonic) KX-F90B type fax machine, powered on, the LCD no display, the machine without any movement.