2002 Xerox Phaser 840/850/860/8200 Color Printer (P/N 071-0723-00)

This 287-page PDF is Xerox's April 2002 Phaser 840/850/860 Network Color Printer Service Manual with the Phaser 8200 Color Printer Addendum, P/N 071-0723-00. It is written for qualified service personnel, and Xerox recommends Phaser 840/850/860 service training. The material is best suited to technicians who already understand electrical isolation, powered diagnostics, hot solid-ink systems, and motor-driven print-engine mechanisms.

• Covers printhead, drum/transfix, paper/drum heater, upper feed roller, X-axis drive, Y-axis belt drive, cap/wipe/purge assembly, main board, power control board, and power supply diagnosis and repair.
• Traces BIST, POST, rear-panel LED codes, fault-history messages, customer-mode power-up sequences, and system faults from the 2,000 I/O-board group through the 31,000 motor-fault group.
• Provides Repair Analysis Procedures for power failures, shorted drivers and motors, paper-pick and transfer jams, media skew, process-drive faults, weak or missing jets, ghosting, wrinkling, banding, and repeating print defects.
• Details service test prints and factory adjustments for process and exit belts, Y-axis belt tension, X-axis scale, cap/wipe/purge belt timing, drum-position encoder gap, transfix roller pressure, NVRAM resets, and Phaser 840 printhead-to-drum spacing.
• Maps the main board, power control board, I/O boards, sensors, clutches, solenoids, motors, heaters, High-Capacity Paper Tray connections, and the print engine's I2C communication path.
• Supplies illustrated FRU identification, model-dependent part numbers, service-tool listings, electrical test specifications, adjustment data, and component inspection information.

Model and Configuration Coverage

Configuration information distinguishes Phaser 840N/DP/DX/GP/DPF, 850N/DP/DPF/DX, and 860B/N/DP/DPF/DX builds, including their main-board, memory, networking, hard-drive, duplex, paper-tray, printhead-mount, Y-axis, and cap/wipe/purge differences. The parts chapter also identifies serial-effective and discontinued FRUs where applicable.

The two-page Phaser 8200 addendum states that Phaser 860 characteristics apply unless an exception is listed. It documents the 8200's revised PowerPC platform, unique ColorStix 8200 ink shapes and formulation, reorganized Service Tools menu, changed internal pages, and 8200DX memory configuration. This is a differences-only addendum; most Phaser 8200 repair coverage therefore comes from the Phaser 860 sections in the main manual.

Diagnostics, Illustrations, and Workshop References

The Phaser 860 section explains front-panel Auto Diagnostics, Customer Accessible Diagnostic Mode, and Service Diagnostics Mode. Its menu covers current temperatures, supply voltages, paper-path status and timing, Y-axis geometry and belt slip, cap-axis geometry and drive, cap vacuum, drum-maintenance performance, process-motor tracking, and transfix loading. Comparable Phaser 840/850 checks may require the PC diagnostic software, serial cables, service adapter, or service plug identified in the tool list. Twenty-three service test-print selections support printhead, X-axis, head-to-drum gap, color-fill, drum-seal, skew, and banding evaluation.

Named visual references include The printer's I2C bus, Printhead maintenance system of the print engine, right- and left-side sensor maps, the Print engine wiring diagram, Aligning (timing) the cap/wipe/purge assembly drive belts, and the drum/transfix removal views. Additional wiring-fold drawings show harness and vacuum-hose routing. FRU exploded views cover imaging, paper path, motors and fans, circuit boards, solenoids and clutches, gears and belts, sensors and flags, and the High-Capacity Paper Tray.

Special tools are identified by part number, including the Y-axis encoder spacer 003-1489-00, Phaser 840 belt tensioner 003-1500-00, Phaser 840/850 service plug 003-1707-00, Phaser 840 head-to-drum gap clip 650-4197-00, and vacuum gauge assembly 650-4051-00.

Scope and Repair Cautions

This PDF illustrates removal and replacement of key FRUs, but the manual assigns printer theory of operation, more detailed removal/replacement procedures, configuration-page explanations, and some operation-verification material to the companion Color Printer Service & Support Resources CD-ROM.

The repair cautions are specific to this mechanism. Because NVRAM retains the last known printhead and cap/wipe/purge positions, moving those assemblies while power is off can set up a collision at the next startup. The manual also warns that disturbing drum-encoder indexing can move stripper-finger or rapid-release-guide contact marks into the printable area, while incorrect wiring or vacuum-hose dressing can leave harnesses pinched or exposed to moving parts.

AC line voltage can remain present at the heaters while the printer is switched off but still plugged in. Disconnect power as directed and follow the manual's qualified-service restrictions before internal repair work.