2005 Xerox Service Manual for CC C123/128, WC M123/128, Pro123/128, CC 133, WC 133, Pro133 Copier/Printer (P/N 705P 00902)

Xerox publication 705P 00902 (EDOC) is the 1st Version, September 2005 factory service and repair manual for the Xerox CopyCentre and WorkCentre 123/128/133 platform. This 1,177-page PDF covers NASG (XC) and ESG (XE) machines across eight service sections. Xerox states that the documentation is intended only for certified, product-trained service personnel; its service-mode, PWS, high-voltage, laser, and ESD procedures assume that level of training.

• Exact model coverage: CopyCentre C123 and C128 plus CopyCentre 133; WorkCentre M123 and M128 plus WorkCentre 133; and WorkCentre Pro 123, 128, and 133. Product data distinguishes platen and DADF builds, 2TM and tandem-tray configurations, and regional hardware variants.
• Fault isolation: Uses service-call flow plus fault-code and non-code RAPs spanning paper feed and DADF jams, fuser and finisher faults, ROS/IIT imaging, fax and network services, UI/ESS electronics, memory and software, and xerographic process faults.
• Factory repair procedures: Covers removal and replacement of the main drive and paper path; ROS, xero/developer, fuser, and MPT assemblies; MCU/ESS electronics and IIT optics; plus DADF, 2TM/TTM, and finisher transport, stapling, and stacker mechanisms.
• Adjustments and firmware: Includes toner-density and bypass-guide adjustments; IOT/IIT registration, edge erase, reduce/enlarge, UI alignment, scan-carriage position, and DADF registration, height, and position. Firmware loading covers ESS, FCB, IIT/IPS, and DADF ROM through USB, network, or parallel connections.
• Image-quality diagnosis: Supplies IOT and IIT entry RAPs, copy-quality specifications, and defect samples for low density, background, ghosting, deletion, skew/misregistration, unfused or offset toner, repeating bands and streaks, CVT scan streaks, and moire.
• Electrical documentation: Provides plug/jack location drawings, AC/DC wirenets, and block schematics such as DC Power Distribution, PWB Communications, Document Feed and Transportation, Charging and Exposure, Fusing Heat Control, and Finisher DC Power and Interlock Switching.
• Parts, tools, and options: Pairs illustrated parts lists and a part-number index with Xerox product tools and image-quality test patterns. The accessories chapter contains installation procedures for the Fax Kit and Foreign Interface.

Service-Call Logic and Diagnostics

The call flow begins with operator questioning, power-cord and network checks, billing-meter readings, and review of the HFSI, jam, fault, and shutdown histories. It then routes the technician by copy, print, fax, accessory, network, or image-quality symptom. Xerox calls for HFSI actions first, basic-printer faults before accessory faults, and image-quality work after other problems have been corrected.

UI Diagnostics goes well beyond reading a code. It provides IOT, IIT, controller, and fax NVM lists; HFSI counter reading and initialization; serial-number and billing-data functions; component control; hard-disk diagnostics; test-pattern printing; special boot modes; and fax diagnostics. Jam, failure, and shutdown reports help separate recurring events from isolated faults before parts are replaced.

Configuration Detail and Repair Scope

Parts and wiring data distinguish 23/28-cpm hardware from 33-cpm hardware in the main drive, feeders, duplex unit, MCU/ESS boards, tray modules, harnesses, and connector locations. Firmware guidance also separates standard CopyCentre/WorkCentre software from WorkCentre Pro files for machines equipped with PostScript.

Section 4 supplies dedicated REP procedures where safety, cleaning or lubrication, a follow-up adjustment, a special tool, or a non-obvious removal order makes the exploded view insufficient. Section 5 carries the corresponding assembly drawings and part numbers, including the DADF, duplex, 2TM, tandem tray, fax, and finisher assemblies.

Electrical Reference, Tools, and Service Risks

The electrical reference explains meter-lead placement and DC-common use, differentiates 100/120V and 220V input units, and gives logic-state limits for the 5V and 24V circuits; the wiring section also maps 3.3V, 5V, and 24V distribution networks. The tool list identifies the HVPS test probe 600T 01653, probe adapter 600T 01996, firmware-upload USB cable 600T02231, network crossover cable 600T 02252, and Xerox test patterns by part number.

The PWB repair cautions flag two costly mistakes: replacing both the MCU and ESS boards with their EPROMs at the same time can disable the machine and cause loss of serialization and billing data, while careless EPROM handling can break its pins. Because servicing exposes Class 3B laser radiation, electrical shock hazards, ESD-sensitive boards, and a hot fuser, follow the manual's isolation, interlock, ESD, and cool-down warnings before beginning physical repair work.