Question about power driven Mamiya RB67 film backs

I'm new to this forum and I'm hoping someone out there can help me. I bought a Mamiya RB67 ProS today. It came with the 150mm C soft focus lens and a battery driven back that can use both 120 and 220 film. It didn't come with any of the manuals. I found and downloaded the appropriate camera manual but I can find nothing on using the battery powered back. Any assistance would be greatly appreciated. Thanks.

Hi,

YOu can find out about your camera at:
Dead Link Removed

This is the Mamiya Users Group operated by Mamiya. MAmiya tech guys hang out there as do lots of other users. Great source of information. The Mamiya site also has manuals in PDF format.

Onward,
Paul