service manual

MedWrench is available to help people with specific questions and troubleshooting problems. Could you please be more specific with the issue that you are having with your instrument, and the MedWrench team will do their best to assist you in solving the issue. This will also help other community members who face similar challenges.

For the TI500 itself, there's not much in the way of PMs. Replacing the air filter every 6 months, replacing the batteries every 2 years, replacing the fan motor every 3 years. Unfortunately, however, the actual manual is restricted to those that subscribe to the Drager database. The rationaile is that when you log in to access it, it's the latest, greatest, most up-to-date edition of the manual. :-)

For the other items such as the ventilator, that's a lot more detailed (as all ventilators are).  If you search for the brand name, you'll probably find it.