Canon W6400 Large-Format Printer Service Manual (2005)

Canon’s W6400 Series Service Manual, dated April 5, 2005, covers the W6400 large-format bubble jet printer for roll media and cut sheets. It explains the printer’s operating theory, mechanical repair, electrical fault diagnosis, adjustments, and service modes.

Searchable PDF with Chapter Bookmarks

Text search and diagram detail: Searchable text and embedded PDF bookmarks provide access to chapters and individual service topics. Small connector numbers and labels in the dense printer block diagram require zooming.

Supplied as one printable English PDF with 196 pages total, including the original cover, two closing pages, and 21 blank pages.

Ink-Path Service, Print Alignment, and Fault Diagnosis

The following selected topics illustrate the manual’s coverage. Other subjects include roll-media barcode detection and printhead overheating protection.

• Ink-path service: Automatic and manual ink drainage, ink-tube removal and assembly, ink-tank unit removal, and ink-supply valve operation.

• Carriage and purge assemblies: Carriage and head-holder removal, carriage-belt installation, purge-unit replacement, and component handling precautions.

• Print alignment: Head-holder tilt adjustment, feed-roller eccentricity compensation, registration-sensor optical-axis adjustment, and head-management sensor positioning.

• Fault diagnosis: Symptom-based checks and warning, error, and service-call troubleshooting for printing, media feeding, ink supply, motors, fans, and controllers.

• Electrical reference: Printer interconnection diagrams, controller and relay-board layouts, power-supply documentation, and connector pin assignments with signal descriptions.

• Service functions: Nozzle-check patterns, component operation tests, usage counters, controller replacement mode, and firmware-update guidance.

Canon issued this manual for qualified service personnel; its internal electrical work and service-mode adjustments call for printer-service knowledge and suitable test equipment.

Ink Drainage and Mechanical Repair

Step-by-step instructions cover ink-tube and carriage removal, head-holder access, and purge-unit replacement. The disassembly flow diagram identifies the covers, connectors, fasteners, and intermediate assemblies involved in reaching major components.

The manual distinguishes automatic drainage through the Move Printer function from manual drainage when an electrical, firmware, or power-supply fault prevents normal operation. Specified equipment includes syringe CK-0541-000 and connecting tube QA2-6161-000.

Replacement work is linked to follow-up adjustments. Carriage or registration-sensor replacement requires optical-axis compensation, while work affecting the feed roller, its home-position sensor, or its encoder requires eccentricity adjustment. The documented calibration conditions specify photo glossy paper and the LOW head position.

Moving the carriage while the printhead remains capped can drag the cap rubber against the nozzles and damage the printhead.

Troubleshooting and Electrical Reference

The diagnostic sections distinguish host or interface problems from faults that also affect the printer’s own test output. They also separate printing problems with a full ink supply from failures involving unfilled ink passages, helping technicians choose the relevant checks before selecting replacement assemblies.

Reference illustrations include the Printer Block Diagram, Print Signal Sequence, Power Supply Block Diagram, and feed-sequence flowcharts for roll media and cut sheets. Connector tables identify signal names, direction, and function for the system controller, engine controller, carriage relay PCB, head relay PCB, power supply, and printhead.

Warning and error histories provide context for intermittent faults. I/O DISPLAY is marked for support in a later firmware version, so live sensor-status display should not be assumed available on the installed firmware.

Controller Replacement, Firmware, and Handling

Controller Replace Mode transfers stored settings and counter data between the old and replacement boards. The system and engine controllers must not be replaced simultaneously; the manual also identifies network settings that are not restored automatically after system-controller replacement.

Firmware coverage explains use of the GARO Firmware Update Tool for the system controller. Transport instructions distinguish a short move on the same floor from relocation requiring ink drainage, packing, and refilling.

Conductive ink on energized electrical assemblies can damage the boards. Follow the manual’s electrical-isolation, static-control, and moving-carriage precautions during service.

Waste-Ink Detection: Specification Preview

The maintenance-cartridge reference places the “MTCart Full Soon” warning at approximately 800 ml of accumulated waste ink; printing can continue at that stage.

At approximately 1000 ml, the cartridge is treated as full and printing stops until it is replaced. Waste-ink quantity is tracked by counting ink discharge rather than by directly measuring the liquid level.