The following manual contain detail information about Nokia N91 Wiring Diagram and Electrical Schematic for Repair and Troubleshooting. The purpose of this document is to provide further technical repair information for Nokia mobile phone. It contains additional information such as e.g. "Component Finder". The "Signal Overview" page gives and fast overview about the most important signals and voltages on board. This manual is divided into sections as follows: Front Page (exploded view), System Connector, RETU, TAHVO, RAP3G, Memories, OMAP, Memory, Camera, HDD, WLAN, BT, FM-radio, Audio-DAC, UI, RF-part, Signal Overview and Component Finder.