Ricoh A250 Service Manual page 360

PAPER LIFT MECHANISM
The paper size thresholds for this feature depend on SP1-908-8 and 9. (Note that
there are two paper size thresholds: small and middle. Some models only use the
small threshold.) The amount of reverse depends on SP 1-908-1, 2, and 3. (See
the table later in this section for details of how these SP modes work.)
For A4-width paper or wider, a projection [H] on the side fence engages the
secondary pressure spring [J] through a lever [I] . Then, the secondary pressure
spring [J] applies paper feed pressure in addition to the main pressure spring [K], to
ensure that extra pressure is applied to wider paper.
As stated earlier, various SP modes control this mechanism. The following table
summarizes them.
No Middle Size Programmed
(Default for A250)
Paper width:
More than 1-908-8
(Default: Wider than HLT)
Amount of reverse:
(Default 300 ms)
Paper width:
1-908-8 or less
(Default: HLT or narrower)
Amount of reverse:
(Default: 600 ms)
When the paper tray is pulled out, the pins [A, C] disengage from the couplings [B,
D], and the bottom plate drops. To make it easier to push the tray in, the lift motor
rotates backwards 1.7 seconds to return the bottom plate pressure lever coupling
[D] to the original position.
A250
1-908-1
1-908-2
With Middle Size Programmed
Paper width:
More than 1-908-9
Amount of reverse:
1-908-1
Paper width:
More than 1-908-8, up to and
including 1-908-9
Amount of reverse:
1-908-3
Paper width:
1-908-8 or less
Amount of reverse:
1-908-2
10-8 SM