canon ipf8100 Show the multi sensor

[elamurugu]

I Replaced carrage unit but still same, Display show the Multi sensor error.

[Iowatech]

It has been some time since I've worked on Canon wide format machines, so I don't know what you should do next.
On the other hand, here's where a lot of the active Canon techs can be found:
http://www.copytechnet.com/forums/canon/
There are a lot of smart people there, they should be able to help.