Service manual

Feeder Speed Encoder
A blue-clad optical encoder located on the right side of the upper pullout
shaft. It is used to detect feeder run speed.
A.2c ACCUMULATOR SECTION
The accumulator receives and holds paper coming from the feeder. It will
stack groups from one to seven documents. When the document group is
complete, the computer releases the group to be folded by the folder.
Stacking Ramps
Stacking Ramps are the black Delrin wedges that stack successive pages of
a document package in page sequential order.
Stacking or Dump Rollers
These are used to stop the paper and hold it in position. When released, the
rollers drive the collected pages out of the accumulator.
Dump Brake
This prohibits the rollers from releasing paper from the accumulator.
Dump Clutch
This activates the stacking rollers, releasing the accumulated pages.
Accumulator Sensor
The Accumulator Sensor indicates presence or absence of a package in the
accumulator. It also monitors package discharge when the dump clutch has
been engaged.
Stack Sensor
The Stack Sensor detects that the page group that was stacked in the
accumulator has left the accumulator.
420T V6LT OPERATOR & SERVICE MANUAL ISSUE 2009/06 Rev. 6/21/2011 SECTION A – PAGE 14
071-33370-400
INTRODUCTION
Right Side of Feeder
420T Accumulator