ADF cover sensor (PS10)
The ADF
Document-detect sensor (PS2)
The
Leading-edge sensor (PS1)
When a document enters the document transport path, it must pass the
ADF motor
The ADF motor is controlled by the scanner controller board. When the scanner controller receives the scan command, the ADF motor rotates counterclockwise, which starts rotation of the feed and delivery rollers.
Document pickup process
When the document pickup solenoid is activated, the pickup and separations rollers begin to rotate. If more than one source document is in the pickup tray, the separation roller and separation pad clear the multiple feed, and then the first document is sent toward the flatbed.
Document jams
The scanner controller board detects a jam by verifying that each document passes the leading- edge sensor in a specified amount of time. If a document does not pass by the sensor in time, the scanning operation stops. A
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| The intake fan draws fresh air into the flatbed assembly. It is controlled by the |
| which is located on the scanner controller board. The fan is off in PowerSave mode, it rotates at |
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| fan motor is |
| on the |
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CAUTION | The fan must be replaced so that it draws air into the flatbed. Failure to correctly position the fan |
| can result in damage to MFP components. Verify that the airflow arrow (located under the drive- |
| belt tension bracket) embossed on the fan housing points into the flatbed. See, “Correctly orient |
| the intake fan and bracket” on page 107. |
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68 Theory of operation |