Hi daisizhou, if are the Datex Ohmeda Aespire 7100 or 7900 I have the service manuals in pdf format, I have the service manual of the ventilator and the anesthesia machine here you can find the modes for diagnostic or service.
therefore for access to the service mode you must:
1. hold push the control fan Knob.
2. Turn on the switch of datex ohmeda anesthesia system.
Now, you can navigate in the service mode where you can choose an variaty of technical options, but, you must have care.
I hope these information be useful, and greetings from Mexico City.
Catch you later.
