西门子NCU维修故障： 西门子NCU573.4 6FC5357-0BB34-0AE1没有显示
1.西门子840d数控系统西门子NCU开不了机，开机NCU不能启动。
2.西门子840d数控系统的NCU盒7段数码管没有显示，屏幕报警提示NC/PLC未连接，（NCU和PCU都有问题）。
3.送电瞬间所有灯都亮，但是数码管无显示，然后所有灯瞬间变暗，POK灯熄灭，数码管不亮
板子h1，h2灯全亮的故障
5.840d系统，现报2120号警（NCK风扇报警），更换了一块NCU盒后仍然出现2120报警--NCU坏了
6.840d系统NCU不能启动。西门子840D/DE数控伺服系统NCU主板维修型号：

NCU 571.2数控主板 6FC5357-0BB11-0AE0

NCU 571.3 数控主板6FC5357-0BB11-0AE1

NCU 571.3数控主板6FC5357-0BB13-0AA0

NCU 571.3数控主板 6FC5357-0BB13-0AA1

NCU 571.4 数控主板 6FC5357-0BB14-0AA0

NCU 571.4 数控主板 6FC5357-0BB12-0AE0

NCU 571.5 数控主板 6FC5357-0BB15-0AA0

NCU 572.2 数控主板 6FC5357-0BB21-0AE0

NCU 572.2 数控主板 6FC5357-0BB21-0AE1

NCU 572.2 数控主板 6FC5357-0BB52-0AE0

NCU 572.3 数控主板 6FC5357-0BB22-0AE0

NCU 572.3数控主板 6FC5357-0BB23-0AA0

NCU 572.3 数控主板 6FC5357-0BB23-0AA1

NCU 572.4 数控主板6FC5357-0BB23-0AE0

NCU 572.4 数控主板 6FC5357-0BB24-0AA0

NCU 572.5 数控主板 6FC5357-0BB25-0AA0

NCU 573.2数控主板 6FC5357-0BB31-0AE0

NCU 573.2 数控主板6FC5357-0BB33-0AE0

NCU 573.2 数控主板6FC5357-0BB33-0AE1

NCU 573.2数控主板6FC5357-0BB53-0AE1

NCU 573.3数控主板6FC5357-0BB33-0AE2

NCU 573.3数控主板 6FC5357-0BB33-0AE3

NCU 573.3数控主板6FC5357-0BB33-0AA0

NCU 573.3 数控主板 6FC5357-0BB33-0AA1

NCU 573.4数控主板 6FC5357-0BB34-0AA0

NCU 573.4 数控主板 6FC5357-0BB34-0AE0

NCU 573.4 数控主板 6FC5357-0BB34-0AE1

NCU 573.5 数控主板 6FC5357-0BB35-0AA0

NCU 573.5数控主板 6FC5357-0BB35-0AE0

NCU 561.4数控主板6FC5356-0BB12-0AE0

NCU 573.5数控主板 6FC5357-0BB35-0AE0

NCU box for accommodating the NCU561.5/571.5/572.5/573.5

NCU 561.5 数控主板6FC5356-0BB15-0AA0

NCU 571.5 数控主板 6FC5357-0BB15-0AA0

NCU 572.5数控主板 6FC5357-0BB25-0AA0

NCU 573.5 数控主板 6FC5357-0BB35-0AA