The service documentation for the Furuno FM-8900S VHF Radiotelephone is typically split between an Installation Manual and an Operator's Manual, as a single comprehensive "Service Manual" is often restricted to authorized dealers.
Motorola Solutions typically provides service manuals for their products through their official website or by request through their customer support channels. Here are some possible ways to obtain a service manual for the FM8900S:
Operator's Manual: Focuses on DSC distress alerting, channel selection, and basic setup.
Operator's Manual (OME-56800): Focuses on daily use, including DSC distress operations, general message calling, and menu navigation.