Ricoh LD013, Service Manual

Page: 305 / 513

ORIGINAL SIZE DETECTION
B387 8-4 SM
2. DETAILED SECTION DESCRIPTIONS
2.1 ORIGINAL SIZE DETECTION
The DF uses two width sensors (width sensor 1 [A] and width sensor 2 [B]) to
detect the original width, and two length sensors (length sensor 1 [C] and length
sensor 2 [D]) to detect the original length. The DF detects the original size based
on the combination of inputs from these sensors, as indicated in the table on the
next page.
If using a non-standard original size, the user must input the original length at the
operation panel.
The original width sensors have four possible output states: P1 to P4. The output
depends on the position of the ridges on the toothed plate attached to the original
rear fence.
During one-to-one copying, copy paper is fed to the registration roller in advance to
increase the copy speed. The original exit trailing edge sensor [E] monitors the
stack of originals in the feeder, and detects when the trailing edge of the last page
has been fed in. This stops the ADF from causing the feed of an unwanted extra
sheet of copy paper.
B387V101.WMF
[E]
[A]
[B]
[C]
[D]