Feeder Unit - Canon WS8400 Service Manual

c) Action to take after replacing the carriage unit
Clicking the figure number under the video mark allows you to view the movie showing the procedure.
d) Action to take after replacing the carriage unit or registration sensor
Since the distance between the registration sensor (in the carriage unit) and the nozzle (in the print head) varies between printers, the optical axis is factory-
adjusted to tune the image write start point. Therefore, when you have replaced the carriage unit or registration sensor, adjustment is required.
Use the service mode under the following conditions:
Service mode: SERVICE MODE > ADJUST > PRINT PATTERN > OPTICAL AXIS
Head height: Low position
Media type: Glossy photo
Media wide: paper width 36inch or more

4.3.8 Feeder unit

a) Handling the feed roller
The feed roller is a functionally important part. Therefore, be sure to note the following points when handling the roller.
- Do not hold the roller with one hand or warp its shape.
- Do not touch the roller surface (coated surface).
- Do not allow the roller to get scratched or marked.
- Hold the roller at two points; location D and one of the locations A, B, or C as shown in the figure below.
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Chapter 4
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