Canon 300 Operation Manual page 94

Streaks appear in images
Paper becomes jammed
Paper jams occur frequently
Documents are double fed
A stack of documents are fed
together
Scanning starts immediately
after I press a job button (certain
users only)
5-4
Scan
Cause The scanning glass is dirty.
Refer to the ScanFront 300/300P INSTRUCTIONS (electronic manual)
Solution and clean the scanning glass. If there are scratches on a scanning glass,
contact your local authorized Canon dealer.
Cause
The rollers are dirty.
Refer to the ScanFront 300/300P INSTRUCTIONS (electronic manual)
Solution
and clean the rollers.
Cause The rollers (consumable parts) have worn out.
Solution Contact the administrator of the ScanFront and then replace the rollers.
Static electricity is causing the pages of the document to stick to each
Cause
other.
Solution
Before you load a stack of documents, fan the documents.
Cause The type of paper of the documents is causing a paper feed error.
Load no more than ten pages of documents. (See p. 2-10.) Use bypass
Solution
feeding to scan the pages one by one.
Cause
The feed selection lever is set to Page Separation OFF. (See p. 2-5.)
Solution Set the feed selection lever to page separation feeding.
The job buttons are designed to work that way. See "Skip Scan Setting
Cause
Screen" on p. 4-17.
Solution
Place the document and then press a job button.