This service repair manual covers the HP Compaq nw8440, nc8430, and nx8420 mobile workstation laptops manufactured by Hewlett-Packard. These devices are designed as powerful mobile workstations, featuring Intel Core Duo processors, options for integrated or discrete graphics like the ATI Mobility FireGL V5200, TFT Active Matrix displays, SATA storage, and DVD+/-RW SuperMulti DL drives. Connectivity is robust, including Gigabit Ethernet, wireless LAN, Bluetooth, and a comprehensive array of ports such as USB 2.0, VGA, S-Video, audio jacks, docking connector, RJ-45, RJ-11, and FireWire. They also offer expansion via an ExpressCard/54 slot and utilize DDR2 SDRAM across two SODIMM slots.

This manual provides essential information for the service and repair of these HP laptop models. It details disassembly and reinstallation procedures, troubleshooting charts for diagnosing and resolving common issues, and lists of replaceable components with their corresponding part numbers. Furthermore, it includes guidance on performing firmware updates for the BIOS and other system components. This comprehensive English-language resource is intended to assist owners, technicians, and service professionals in maintaining the optimal performance and longevity of their Compaq mobile workstations.