This comprehensive service repair manual for the Samsung CLX-9250ND and CLX-9350ND printers, along with the CLX-FIN40S and CLX-FIN40L finishers, provides detailed diagrams, pictures, and full procedures to diagnose and repair these models. It covers everything from safety precautions and product descriptions to replacement procedures, service mode (diagnostic mode) instructions, firmware updating, preventive maintenance, troubleshooting, system diagrams, system recovery, and reference information.

The manual begins by outlining safety warnings and precautions to ensure safe handling during repairs. It then delves into a detailed product description, covering system configuration, paper path, sensor locations, paper handling sections (including paper trays, pick-up unit, registration unit, and MPF unit), image formation, the fuser unit, the laser scanning unit, the printer drive system, the scanner system, the DADF system, and printer electronics configuration.

The manual then provides thorough step-by-step procedures for replacing various components, including the cover, OPE unit, scan unit, fuser unit, cartridge transfer unit, electrical components, main drive unit, pick-up drive unit, MP/Regi drive unit, Exit drive unit, DADF unit, paper handling section, laser scanning unit, and cassette heating cable.

It offers a complete guide to the service mode (diagnostic mode), detailing how to access and navigate the menus, interpret information, perform maintenance counts, run diagnostics, and utilize service functions. The manual also explains how to update firmware, both from the printer control panel and over the network.

Comprehensive preventive maintenance (PM) procedures are provided, outlining PM supplies required and detailed steps for maintaining the toner cartridge, imaging unit, cartridge transfer unit, 2nd transfer roller, fuser unit, pick-up/retard/forward roller, ozone filter, dust filters, DADF rollers, and MP pick-up/retard/forward roller. Cleaning instructions for various components are also included.

The troubleshooting section covers checking symptoms, error codes and messages, image quality problems, and other errors. It includes detailed descriptions and solutions for common issues such as vertical or horizontal white/dark bands, color spots, foggy backgrounds, blurred images, incorrect color registration, uneven pitch and jitter, skewed images, low image density, blank or black copies, uneven density, gradation reproduction failure, void areas, white spots, poor fusing performance, offset, paper back side stains, white halo, DADF skew testing, and other errors.

System diagrams are provided for the engine, main board & OPE, scan & DADF, bottle joint board & side joint board, DC control board & LSU joint board, cassette joint board & drive joint board, and heater.

The manual concludes with a detailed explanation of the system recovery process, including entry points, USB and network recovery methods, confirmation, error, and progress pages, error lists, HDD repair, and HDD failure scenarios. It also provides valuable reference information, including tools for troubleshooting and a list of abbreviations.

This comprehensive service repair manual equips technicians with the knowledge and procedures necessary to effectively diagnose, repair, and maintain Samsung CLX-9250ND, CLX-9350ND printers, and CLX-FIN40S and CLX-FIN40L finishers.