Toshiba e-STUDIO556 Service Manual page 478

[B] Duplex copying:
(1) Check the image using the chart (original)
with vertical and horizontal lines in the
following procedure.
Place the chart provided as an original with
its face down on the original tray of the
RADF, select [2 Sided -> 2 Sided] and make
copies.
(2) Superimpose the chart on the copy and
check the inclination of the copy image.
(3) If the adjustment is necessary, open the
original jam access cover and change the
position of the lower screw fixing the plate.
Loosen the screw, lift the guide and then if
the image skew is "C" as shown in the figure
above, shift the aligning plate in the direction
of "+", and if "D", shift it to "-".
e-STUDIO556/656/756/856/557/657/757/857
ADJUSTMENT
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Chart
Fig. 6-74
C
Fig. 6-75
Fig. 6-76
D