Epson Stylus Pro 7700/7710/7700M/7710M/7900/7910/9700/9710/ 9900/9910/WT7900/WT7910/9890/9908/7890/7908 Service Manual (P/N SEIJ08005)

• A 518-page PDF of Epson service manual SEIJ08005, Revision H, dated October 8, 2010, covering 16 model variants, including M-series Copy Mode and White Ink configurations.
• Printhead and ink-path repair covers the Ink System Unit, wiper cleaner, pressurizing unit, cartridge holders, ink selector, and supply tubes, with ink-discharge and air-leak test procedures.
• Carriage (CR) and paper-feed (PF) sections detail motor and encoder replacement, APG mechanism service, rewind-unit removal, and cutter-unit replacement.
• Error-message diagnostics distinguish maintenance requests from service-call faults and provide symptom-based troubleshooting for missing dots, ink smears, and horizontal or vertical banding.
• Factory adjustments cover printhead slant, Auto Uni-D/Bi-D alignment, CR/PF timing-belt tension, platen gap, and paper-feed correction, with separate head-to-wiper clearance checks.
• SpectroProofer and Auto Take-up Reel service extends to accessory disassembly, drive motors, sensors, circuit boards, and functional inspections, including color-measurement and USB connection checks.

Model Coverage, White Ink, and Copy Mode

24-inch models: Epson Stylus Pro 7700/7710, 7700M/7710M, 7900/7910, WT7900/WT7910, and 7890/7908.

44-inch models: Epson Stylus Pro 9700/9710, 9900/9910, and 9890/9908.

The five-ink 7700/7710, 7700M/7710M, and 9700/9710 configurations have dedicated Photo Black and Matte Black nozzle rows rather than an ink selector. Model-comparison tables distinguish pump/cap assemblies, cartridge holders, control panels, and main boards that may look similar but are not interchangeable.

White Ink coverage addresses cleaning-liquid substitution, White Ink Refresh, sedimentation, and ClearProof Film print defects. Film-specific troubleshooting separates surface-print and reverse-print problems and specifies a narrower temperature/humidity operating window than the printer's general environmental limits.

The M-series chapter covers enlarged copying with a directly connected GT-2500 scanner, copy settings, and related errors. Internal scanner repair requires the separate GT-2500 service manual; this publication covers the printer and its Copy Mode integration.

Internal Mechanics and Adjustment Parameters

Disassembly flowcharts, including the Carriage Mechanism flowchart, identify access paths to the serviceable assemblies. Reassembly notes flag cable routing, ink-tube joint seals, and adjustments required after removal or replacement. Factory restrictions on dismantling precision-aligned frame components are identified.

The parts-identification section records a December 2009 pump/cap production change. AID-board service distinguishes earlier and revised mounting arrangements, including installation of the newer board in an older chassis. Dedicated AID diagnostics address communication faults, electrical leakage at the flushing box, and automatic nozzle-detection failures.

A diagonally seated head flat-flex cable (FFC) can damage the printhead drive circuit or blow the main-board fuse. The service-call diagnostics cover this repair pitfall under error 1A39.

Calibration and Technical Specifications

The Adjustment Items and the Order by Repaired Part matrix distinguishes work required after removal from work required after replacement. Main-board repair has separate requirements depending on whether the original NVRAM data can be backed up. Procedures cover backup/restoration, Head Rank ID entry, firmware installation, and CR/PF motor-characteristic input. The board-replacement cautions explain when missing motor-characteristic labels require replacement of the associated motors.

Paper Thickness Sensor positioning, Ink Mark Sensor sensitivity, Rear Sensor AD adjustment, and T&B&S margin adjustment receive their own procedures. Life-counter resets and final adjustment-result printouts are also documented.

The Color ID calibration procedure is specifically limited to the 7900/7910/9900/9910. Its Adjustment Workflow chart separates on-site calibration from off-site chart measurement, with GretagMacbeth eye-one (i1) calibrator requirements and validation-chart checks.

Software-based work uses Epson's separate Service Program. The tool list identifies the Sonic Tension Meter U-507 (P/N 1294120), Cleaning PG Adjustment Jig (P/N 1507278), and Ink Leak Check Cartridge (P/N 1493143).

Reference data covers electrical specifications, sensor detection criteria, adjustment tolerances, and operating/storage temperature and humidity limits. Lubrication instructions identify approved products and application points. Maintenance sections address ink-path cleaning, storage, and transportation.

Wiring Diagrams and Parts Reference

The Main Body Block Wiring Diagram and connector-assignment tables support electrical fault tracing. Separate Auto Take-up Reel and SpectroProofer block wiring diagrams cover the accessories. An ASP-name conversion table connects the service terminology to the parts lists.

The main-body wiring, appendix parts lists, and exploded drawings use the 7900/7910/9900/9910 as their baseline; other configurations require the documented model differences and applicable Service Parts Information.

Service precautions address electrical isolation, residual charge in the power supply, and pressure in the ink system. Powered testing is limited to the procedures that specifically call for it.