Sorry if this is a bit late but I found this fix on the AVS forum, makes sense since you are in Calgary.
Called Sanyo today around 2:00. Waited on hold for a couple of minutes, then was answered by a guy named Renae(?). Told him what was happening. He told me to get a Philips screwdriver and the projector. Had me take the case off (6 screws) and push a button inside. Then put it back together and it fired right up. He asked me what alt. I live at (~4500ft) and told me I need to adjust the fans. He then talked me through entering the service menu and adjusting the fans. The whole conversation lasted about 10 min.
I was very impressed with the customer service and was especially happy I didn't have to ship it out.
Then a few more posts down...
Exact same thing happened to me a week ago (the Saturday of the Mayweather/De la Hoya fight). I had called Sanyo and spoke to someone there earlier and he suggested I send it to them. So I was about to, but I ran across this thread last night. I decided before I send it off, I'd call and ask for the guy at Sanyo named Ranae (sp?). When I called Sanyo, Ranae was actually the person that took my call. He took me through, I'm sure, the same process and my Z4 worked fine afterwards without having to send it off.
Thanks for posting this and I hope that anyone else that has this problem will find this post as helpful as I did.
Kudos to the tech guy @ Sanyo named Ranae (sp?).
Anthem MRX-500/MPS-1, Sanyo Z5,Rocket 850's,Klipsch RC64 Center.,Mirage OM260 , SVS PB13 ULTRA