2008 Canon MP630 / MP638 Service Manual (P/N QY8-13CB-000)

• Official Canon publication QY8-13CB-000 (2008 revision) covering MP630 and MP638 inkjet printers, including regional sub-variants.
• 47 pages of troubleshooting logic, exploded-view disassembly references, and service-mode diagnostic routines.
• Details critical procedures like EEPROM initialization, print head alignment, and ink absorber maintenance.
• Features targeted sections on ASF unit removal, wiring diagrams, platen unit replacement, paper feed motor adjustment, LF/Eject correction, button and LCD tests, and analyzing the EEPROM information print.
• Covers comprehensive diagnostics such as interpreting Operator Call errors, decoding Service Call errors, resolving B200 and 5B00 error codes, performing print head deep cleaning, executing carriage unlocking, extracting the purge drive system unit, evaluating CD/DVD print position correction, and verifying the ink system function check.

Technical Documentation Scope

The 2008 Canon MP630 / MP638 service manual delivers essential technical specifications for maintenance and diagnostic support. It covers major components including the logic board, scanner unit, paper feed mechanism, and carriage assembly. Chapters clearly break down the system error code structure—separating Operator Call from Service Call classifications—alongside detailed flowcharts for mechanical issues like carriage errors or paper jams. Before proceeding with any internal checks, always ensure the device is completely disconnected from power to prevent electrical shock.

This OEM service publication outlines specific disassembly sequences for the external housing and operational panel. High-resolution imagery maps out internal components and complex cabling layouts. As a comprehensive PDF, it provides exact factory test print patterns and LF/Eject correction values that eliminate diagnostic guesswork. This specific advantage prevents unnecessary parts swapping, significantly streamlining your daily repair operations on the workbench. Furthermore, the guide includes step-by-step instructions that typically require an expensive repair shop visit, such as resetting the internal ink absorber counter via the Service Tool and resolving specific flashing LED codes to restore functionality.

Diagnostic and Calibration Reference Values

Calibration data is thoroughly documented for multiple hardware conditions, such as logic board replacements, paper feed roller changes, and print head adjustments. You will find precise reference values for grease application using FLOIL KG-107A on the carriage rail and Easy-Scroll Wheel base. The manual defines print head alignment parameters for both standard manual and automatic methods, while also establishing ink absorber counter thresholds managed via the Service Tool. Finally, the internal inspection flow provides standard verification patterns to confirm print output quality and proper mechanical operation following any parts swap.