Special Notes On Servicing - Canon PIXMA MX340 Simplified Service Manual

3-4. Special Notes on Servicing

(1) Carriage rail and main chassis adjustment
< Carriage rail >
Perform the following adjustments when attaching the carriage rail:
1) Before loosening the screws, mark their positions on the rail.
2) In attaching the carriage rail, make sure that the screws fit to the marks made in step 1)
respectively, then fasten the screws.
3) Be sure to perform the confirmation test detailed below; confirm that the print quality is
proper and the print head is not contacting the paper.
< Main chassis >
After the main chassis is attached, be sure to perform the confirmation test detailed below;
confirm that the print quality is proper and the print head is not contacting the paper.
< Confirmation test >
Using Photo Paper Pro Platinum, print an image and confirm that the print quality is proper, and
the print head is free from contacting the paper.
If the print quality is not proper, or the print head contacts the paper, adjust the head-to-paper
distance in the following procedures:
< How to adjust the head-to-paper distance >
1) Mark the current position of the screws at the both ends of the chassis. (See the step 1 of
the carriage rail adjustment above.)
2) Loosen the screws, and adjust the head-to-paper distance.
- To prevent the print head from contacting the paper, raise the carriage rail from the
current position.
- To improve the print quality, lower the carriage rail from the current position.
(2) Document pressure sheet replacement
At replacement of the document pressure sheet, perform the following:
1) With the long-side down, position the upper-left corner of the document pressure sheet at the
scanning reference point on the platen glass (back left). Peel off the cover sheet from the
double-sided adhesive tape on the back of the document pressure sheet.
2) Slowly close the document cover. The document pressure sheet will be attached to the
document cover in the appropriate position.
(3) Ink absorber replacement
The following two replacement methods are available for these models.
Perform Partial Replacement for users in your usual service activity since estimated print yield
for the MX340 is approx. 9,000 and approx.12,000 for the MX350.
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