Ricoh PRIPORT VT 2000 Series Service Manual page 126

5.9 PAPER SIZE DETECTION: VT2300/VT2500
[A]
The size of the paper set on the paper table is detected by the three paper
size sensors (photo sensors) mounted on the paper table [A].
The master making process (Master feed direction only) is controlled accord-
ing to the detected paper size so that ink will not be transferred to the pres-
sure roller when the printing paper is smaller than the image on the master.
Paper size sensors [SN1], [SN2], and [SN3] detect the paper size before
the master making process starts. The master making length in the master
feeding direction is determined by sensor ON/OFF states as shown below.
A4 Version:
Paper Size
A3/B4 lengthwise
A4 lengthwise
B5 lengthwise
A5 lengthwise
B5 sideways
LT Version:
Paper Size
DLT lengthwise
LG lengthwise
LT lengthwise
HLT lengthwise
Paper Size Sensor
SN1 SN2 SN3
ON ON ON
ON ON OFF
ON OFF OFF
OFF OFF OFF
Paper Size Sensor
SN1 SN2 SN3
ON ON ON
ON ON OFF
ON OFF OFF
OFF OFF OFF
[
[SN1]
SN2]
[
[SN1] SN2]
[
[SN1]
SN2]
Master Making
Length in
Normal Mode
354 mm
287 mm
247 mm
172 mm
Master Making
Length in
Normal Mode
354 mm (13.9") 354 mm (13.9") 354 mm (13.9")
345.6 mm
(13.6")
269.4 mm
(10.6")
205.9 mm
(8.1")
2-99
28 February '91
B5/LT lengthwise.
[SN3]
A4/LG lengthwise.
[SN3]
B4/DLT lengthwise.
[SN3]
Master Making Length in
Combine 2 Originals Mode
More than Less than 93%
100% ratio
354 mm
287 mm 291.1 mm
247 mm 251.3 mm
172 mm 203.1 mm
Master Making Length in
Combine 2 Originals Mode
More than Less than 93%
100% ratio
345.6 mm 345.6 mm
(13.6")
269.4 mm 269.4 mm
(10.6")
205.9 mm 205.9 mm
(8.1")
ratio
354 mm
ratio
(13.6")
(10.6")
(8.1")