Note For Sheet Check - Hitachi HT-4139-28 Troubleshooting Manual

Note for sheet check

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There might be cases that dual feeding error and size invalid error occurs however the sheet
checking is enabled. Check images comparing the originals and scanned data.
There might be cases that sheet check does not work correctly under some conditions below.
Sheets are adhere and feed.
Dark sheet or paper with a dark border is fed.
Multiple feeding occurs out of detection area.
The four-point detection does not work correctly due to black border.
Sheet is not placed aligned at left edge.
Thin sheet is fed.
Papers with different friction coefficient are mixed.
Specified check during the sheet check.
The sheet check is not enabled.
When the patch cord is printed in the vertical direction.
Troubleshooting
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