Don't really understand your quesion, perhaps you could expand it a little.
Not sure whether you want schematics for BT Routers or the BT Voyager 100 modem. The Modems are not worth repairing (nor probably can they be) because nearly everyone with BT Broadband has a spare in the cupbaord because they are using a router. (Do you want to buy a 105 that I have spare?) The routers are OEM'd from manufacturers and so it would help to know which router you mean.
Terry
September 2006