If you are looking for a entry level A0 size large format multi-functions printer, you will probably ended up with 2 choice, the HP Designjet T830MFP and Canon iPF770MFP (iPF770 with add-on L36 add-on A0 scanner).
The below video will show you printing, scanning and copying function in action. However, before you make your choice, you shall evaluate other factors like below:
1. Warranty period
2. Running cost (printhead and ink cost per ml)
3. Upgradability (Can your MFP separate into 2 devices to suite your future operations needs, can you upgrade your scanner to higher end model if your copying and scanning job increase.)