Laser Scanner System; Outline; Optical Unit Failure Detection; Service Tasks - Canon mf6600 Series Service Manual

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Technical Overview > Laser Scanner System > Service Tasks > Service Notes

Laser Scanner System

Outline

The Laser Scanner System forms a latent image on the photosensitive drum according to the
VIDEO signals sent from the Main Controller.
The main components of the Laser Scanner are the Laser Unit and the Scanner Motor Unit,
which are controlled by the signals sent from the DC Controller.
Diagram of the Laser Scanner Unit is shown below.
Engine controller
DC controller
Scanner mirror
Scanner motor unit
2 Technical Overview > Laser Scanner System > Service Tasks > Service Notes
Main controller
Laser unit
BD sensor
Photosensitive drum
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Optical Unit Failure Detection

The Optical Unit failure detection manages the Laser Scanner failure detection functions.
The DC Controller determines an Optical Unit failure and notifies the Main Controller if the
Laser Scanner encounters the following conditions:
After the drive of Scanner Motor, BD within a specified period is not detected.
•
If the Scanner Motor does not reach a specified rotation within a specified period of start-
•
up.
If an out of specified BD interval is detected during a print operation.
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Service Tasks

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Action for Parts Replacement

No work is required at parts replacement of this product.
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Maintenance

No periodically replaced parts, durable parts or periodical service is set for this product.
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Service Notes

● Point to Note When Replacing the Laser Scanner Unit
Do not disassemble the Laser Scanner Unit in the field because it has been adjusted in the
factory.
Otherwise, it may cause image fault such as color displacement. (You need to replace the
Laser Scanner Unit in that case.)
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