A copy of the FR5000 manual, written for the Eurpoean dPMR FR5000 market can be found here.

http://www.icom.co.jp/world/support/download/manual/pdf/IC-FR5000_FR6000(dPMR)_0a.pdf

Although this is not a IDAS repeater manual, most of the information also pertains to the US IDAS/NXDN market FR5000.