Canon WS8400 Service Manual Download

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Chapter 2

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7.Media skewing detection

1) Feed the media 300mm forward.

2) Drive the carriage and move the registration sensor to media right edge detection start position.

3) Drive the carriage and detect the media right edge (stop carriage return movement when detected), compare with media right edge determined during

media width detection, and determine the skew amount (skew amount depends on the detection precision).

8.Cut media

1) Retract the head from the media (to prevent head wear).

2) Feed the media 367mm backward (342mm if mounted the option cutter unit).

3) The carriage is pushed against the wall opposite the home position and the cutter is dropped in the cutter groove.

4) Drive the carriage in the home position direction, cut the media, and store the cutter.

5) Feed the media 390mm forward (355mm if mounted the option cutter unit).

6) Feed the media 443mm forward (468mm if mounted the option cutter unit).

9.Media leading edge detection

1) Drive the carriage and move the registration sensor 30mm in the forward direction from the media left edge (10mm in the forward direction when in

cutting dust reduction mode).

2) Feed the media 50mm forward.

3) Feed the media backward and detect the leading edge of the media (stop feeding when detected).

10.End roll media feeding

Print standby position

11.Print

<3. Cutter OFF sequence>

If the cutter is turned OFF when feeding the roll media (cutter not used or flat-blade cut disabled), the position where the media should be cut is set as the

leading edge of the media and roll media feeding is completed.

<4. Skew detection sequence>

The user can change the skew error detection amount from the control panel. If skew detection precision OFF is selected, no skew detection is performed

during the roll media feed sequence.

2.3.3.1.3 Cut media feeding

0009-9375

Cut sheet feeding is performed mainly when skew detection is on and when skew detection is off. For media feeding when skew detection is on, media

width detection is performed at the trailing end of the cut media. For media feeding when skew detection is off, media width detection is performed at the

leading end of the cut sheet without performing skew detection.

<1.Cut sheet feeding when skew detection is on>

Cut sheets that are loaded on the platen are transported by the feed rollers.

When cut sheets are loaded with the cut sheet option selected, the upper cover is closed by returning the media release lever, and then the sheet type is set,

the feed motor turns forward and the media sensor detects the trailing edge of the cut sheets loaded on the platen.

After calibrating the registration sensor in this state, media width detection, media leading edge detection, and skewing detection are performed and then

the cut sheet is stopped at the print standby position.

The cut sheets are then fed by a length equivalent to the margin of the leading edge, and printing is started. Feeding of the cut sheets during printing is

performed by controlling the rotation of the feed rollers according to the printing mode.