mjbearit would like you to know that opening up a System One is not without risk, and it helps if you have electronics knowledge before trying to fix a machine like this using the Service Manual. Basically, we assume no liability if you choose to open up your machine-- you're on your own. I would recommend that you don't open up your machine, unless it's out of warranty and you have no other choice.
The link to the PDF manual is available in our Private Files & Links Forum, (CLICK HERE).
[you will need to log into your forum account to access the private files; register here for a free account if you need to]
Once you get into the Private Files & Links Forum, simply click on the thread title that says "LINKS to Members-Only FILES", then click on the link to the Members-Only Files Page in that first post. When you get to the page, scroll down to where the Service Manuals are listed.
Thanks again to mjbearit for finding this!
Apnea Board Administrator