西門子840D數控系統維修故障包括：維修故障包括：按鍵損壞，電源板故障、高壓板故障，液晶故障、主板壞、上電黑屏、 花屏、暗屏、觸摸失靈，不能正常開機、觸摸問題、按鍵問題、屏幕顯示問題（屏碎、花屏、白屏、黑屏等）、通訊問題（觸摸無反應、觸摸反應慢等）、電源故障、主板問題、系統問題等 工控機無法安裝操作系統；工控機按下開關，可以看到指示燈亮，但屏幕無顯示；工控機開機屏幕出現英文或數字報錯 西門子伺服電機
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