2003–2004 Epson Stylus CX6300/CX6400/CX6500/CX6600 Printer Service Manual (P/N SEOT03004)

Epson service manual SEOT03004, Revision C (April 2004), covers the Stylus CX6300, CX6400, CX6500, and CX6600 all-in-one scanner/printer/copier models.

• Printer mechanism repair: Printhead, carriage, CR/PF motor, pump, ASF unit, and paper-path removal procedures, with disassembly flowcharts and reassembly notes.

• Scanner and panel: Scanner housing, CIS unit, home-position sensor, drive unit, and panel-unit disassembly, plus scanner initialization and image-quality diagnosis.

• Electrical troubleshooting: Power-on, USB, and memory-card fault isolation, motor resistance tables, sensor checks, connector layouts, and circuit schematics.

• Mechanical adjustments: Platen gap and PF belt tension procedures, specified tools, and a unit-by-unit matrix of adjustments required after component replacement.

• Programmed adjustments: Head ID input, head angular and bidirectional alignment, PF adjustment, PW sensor calibration, EEPROM copying, and firmware update instructions.

• Service maintenance: Waste ink pad replacement and counter reset, head cleaning, initial ink charge, lubrication diagrams, and final check-pattern printing.

These procedures are intended for experienced repair technicians; the manual specifies Epson-certified technicians for repair work.

Chassis Differences and Repair Access

CX6300/CX6400 units have a metal support behind the middle cover and a memory-card-cover damper; CX6500/CX6600 units omit both. The smaller DuraBrite logo bracket is also identified as a running change for the earlier pair.

ASF disassembly covers the clutch and paper-back cam, with illustrations of spring positions and gear phasing. Separate procedures address the pump/wiper assembly, PE sensor/lever, and power-unit removal.

The Scanner Unit Mechanism view locates the CIS module, HP sensor, and belt drive. Exploded diagrams and the ASP list connect assembly callouts to part names.

Fault Isolation and Board References

The troubleshooting charts separate paper-feed faults, missing dots, scanner initialization failures, and ink-cartridge CSIC read/write errors. Waste-ink maintenance errors have their own corrective work; a counter reset is not a general remedy for carriage, PF motor, or head-temperature faults.

The C545 Main IC Layout and Electrical Circuitry Block Diagram show the board architecture. Connection Relationships of Circuit Board Connectors identifies connections to the panel board, PE sensor, motors, and printhead.

The electrical overview names C536 PSB/PSE power-supply boards, while the appendix schematics are labeled C545PSB/C545PSE. The circuit sheets carry CX6300/6400 titles; board identification matters when consulting these drawings. AC-input tables distinguish the regional power-supply specifications.

Calibration, Software, and Maintenance Requirements

The adjustment matrix links replaced parts to required calibration. EEPROM data copying can preserve settings from a readable original C545 MAIN board, reducing repeated adjustment after board replacement; check-pattern verification remains part of the procedure.

Software requirements: Program-based work uses the separate Epson adjustment program described for Windows 98/Me/2000/XP. Several alignment procedures refer to its How to adjust screens. Adjustment software and firmware files are required separately; this product supplies the manual PDF.

Mechanical service: The PF belt procedure uses a sonic tension meter, listed as Epson tool 1231678. Excessive belt tension can overheat the PF motor coil, and the platen-gap section warns against scratching the printhead with the gauge.

Component-specific torques cover C.B.P-TITE and C.C screws. Cleaning and lubrication instructions identify G-26 and G-63 application points, including the Carriage Unit Lubrication drawing. Nozzle-check and A4 plain-paper/photo-quality check patterns support the final service checks.

Working on live electrical components or internal mechanics carries inherent risks of electric shock or permanent hardware damage; always disconnect AC power and follow standard workshop safety protocols before initiating disassembly.

A Sample of Motor and Lubrication Specifications

These examples are a small selection of the manual's electrical test and lubrication data.

The motor troubleshooting table lists scanner motor coil resistance as 40 Ω ±7% at CN2 on the HP board, pins 1 and 2.

For carriage servicing, the lubrication table specifies 0.26–0.30 g of G-63 for the carriage-unit shaft socket.

Searchable Text, Bookmarks, and Circuit Detail

Text search and drawing detail: Main text is searchable, with embedded bookmarks for chapters and subsections. Circuit labels are graphical and are not included in text searches. Small circuit labels require magnification and remain pale when enlarged.

One printable, English-language PDF contains 125 pages: 8 pages of front matter, 95 pages covering the six technical chapters, and a 22-page appendix with circuit figures, exploded diagrams, and the ASP list. The cover, preliminary pages, and appendix are included in that total.