This Canon i9900 / i9950 Service Manual has been issued by Canon Inc., to provide the service technicians of this product with the information necessary for qualified persons to learn technical theory, installation, maintenance, and repair of products. The manual covers information applicable in all regions where the product is sold. For this reason, it may contain information that is not applicable to your region. This manual could include technical inaccuracies or typographical errors due to improvements or changes made to the product. When changes are made to the contents of the manual, Canon will release technical information when necessary. When substantial changes are made to the contents of the manual, Canon will issue a revised edition. This manual outlines the main service information for the i9900 / i9950 models.
Do not loosen the red screws on both sides of the main chassis securing the carriage shaft position. Media sensor correction This operation adjusts the correction value of the media sensor, installed in the sheet feeder unit, to the EEPROM of the logic board ass’y. The adjustment is required when the sheet feeder unit or the logic board ass’y is replaced, and values are automatically determined via use of calibration media kit (QY9-0064). Calibration media kit The service tool for media sensor correction, consisting of 10 sheets of the reference plain paper, and 1 sheet of the reference white PET paper Red screws of paper feed motor The red screws securing the paper feed motor may be loosened only at replacement of the paper feed motor unit. For details, see Section 3.4 Adjustment / Settings. Cautions after repair for trouble concerning printing or the print head re-installation After repair for trouble concerning printing or the print head re-installation, after emptying the ink in the print head, (if users sent the printer with ink tanks, re-set it with ink tanks) and return the printer to users. (See Section 3.3 Special Notes on Repair Servicing (2) Notes on after repair for trouble concerning printing or re-installation of the print head.).
Before replacement of the logic board ass’y, check the waste ink amount (by service test print or EEPROM information print). If the waste ink amount is 7% or more, also replace the bottom case/output tray unit (bottom case unit) or the complete set of the ink absorbers when replacing the logic board ass’y. See Section 3.4. Adjustment / Settings, (6) Service mode, for details. Only for the 9950i model supporting CD-R printing. Reset the waste ink counter when replacing the bottom case/output tray unit (bottom case unit). See Section 3.4. Adjustment / Settings, (6) Service mode, for details.
Before replacement of the logic board ass’y, check the waste ink amount (by service test print or EEPROM information print). If the waste ink amount is 7% or more, also replace the bottom case/out put tray unit (bottom case unit) or the complete set of ink absorber when replacing the logic board ass’y. See Section 3.4 Adjustment / Settings, (6) Service mode, for details. Replace the print head only after the print head deep cleaning is performed 2 times, and when the problem persists. Before returning the printer to users, empty ink in the print head once. (See Section 3.3 Special Notes on Repair Servicing (2) Notes on after repair for trouble concerning printing or re-installation of the print head.).
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