Hitachi HT-4139-28 Maintenance Manual page 46

When "NG" is displayed, check below.
(1) The sheets are normal?
(2) The rollers are not contaminated?
(3) If the Pinch Roller is contacting partially?
(4) Roller wear of the sheet separation mechanism?
However "NG" is displayed, if more than 80% of the
sheets have passed, judge it is OK.
Fig. 1 Position of recognition
(4) Measurement results of skew will be displayed.
(mm)
Display "OK" (passed) or "NG" (failed)
(5) Click the "Variation of skew(bit) " for the display of
calibration information
(6) Click the "Confirmed" button.
(7) Return to the dialog (1), and click the "Finish"
button.
REV0 2010.02.15
-H7-13-