Service Manual Book 1: Print Engine The Phaser 7400 Color Printer Service Manual is the primary document used for repairing, maintaining, and troubleshooting the Printer The manual is organized into two books. This volume, Book 1, focuses on the print engine with the exception of providing complete diagnostic and troubleshooting procedure for the Printer and all its options. Book 2 focuses on option repair and includes an overview of option theory, option Field Replaceable Unit (FRU) replacement procedures, parts lists, and wiring diagrams. Use Book 2 after you’ve isolated a problem internal to a specific option or when a problem arises at the engine/option interface. Book 1 - Print Engine Use Book 1 as your primary resource for understanding the operational characteristics of the print engine. Book 1 describes Printer specifications, theory and includes information important to the diagnosis and repair of problems occurring in the print engine and attached options. Book 1 also provides detailed print engine replacement procudures, parts lists, and wiring diagrams. Book 1 contains these sections: Introductory, Safety, and Regulatory Information: This section contains important safety information and regulatory requirements. Section 1 - General Information: This section contains an overview of the printer’s operation, configuration, specifications, and consumables. Section 2 - Theory of Operation: This section contains detailed functional information on print engine components. Section 3 - Error Codes and Messages: This section describes the resident diagnostics available to assist the troubleshooting process. These diagnostics include error codes and messages and Service Usage Profile data stored in the Printer This section provides complete troubleshooting information for the print engine and all it’s options. Section 4 - General Troubleshooting: Troubleshooting discussions cover the operation of Power On Self Test (POST), Service Diagnostics, In addition, this section includes troubleshooting methods for situations where no error indicator is available. Section 5 - Print-Quality Troubleshooting: This section focuses on techniques to correct image quality problems associated with Printer output. Section 6 - Adjustments and Calibrations: This section provides procedures for the adjustment of print engine components. Section 7 - Cleaning and Maintenance: This section provides periodic cleaning procedures for the Printer Section 8 - Service Parts Disassembly: This section contains removal procedures for spare parts listed in the Parts List. A replacement procedure is included when necessary. Section 9 - Parts List: This section contains exploded views of the print engine and option FRUs, as well as part numbers for orderable parts. Section 10 - Wiring Diagrams: This section contains the plug/jack locations and the wiring diagrams for the print engine. Appendix A - Reference: This section provides an illustration of the printer’s menu structure, a listing of Printer status codes, and a list of Service Diagnostics tests.