Onkyo T-900 User Manual - Anyone?

Sure would like to get my hands on a T-9090 user manual, I have the service manual.
I have an excellent condition T-9090 but the display button doesn't seem to work and I have no idea what it's supposed to do. I'd like to know before I tear into it. Any help would be appreciated.
Mental, here's a manual,


Looks like that display button only works when using the timer program button.
@ Tls49...thanx, interesting that the display button only functions with the timer program. I'll have to give that a look see...lol...all this time thinking bad button > ouch