在国外的一个论坛上看到过，好像是绿+加+减这三个键一起按，原文是press the suction head on and plus and minus (+/-) at the same time
还有一个方法是i/o板上有2个小按键，按底下的那个，然后屏幕会出现维修菜单，原文
On the I/O board are 2 gel buttons. Press the bottom botton and a Heidelberg button appears on the service screen