Ricoh PB1120 Quick start guide

Paper Feed Unit PB1120/ PB1110
Machine Code: D3ER, D3EQ
Field Service Manual
Ver 1.0
Initial Release: February, 2019
(c) 2019 Ricoh Co.,Ltd.

Symbols and Abbreviations
This manual uses several symbols.
Symbol
What it means
Screw
Connector
Clip ring
Clamp
SEF
Short Edge Feed
LEF
Long Edge Feed
[A] Short Edge Feed (SEF)
[B] Long Edge Feed (LEF)

1
Table of Contents
1. Detailed Descriptions.......................................................................................................................... 2
Overview................................................................................................................................................. 2
Mechanical Components.................................................................................................................... 2
Paper Feed Operation............................................................................................................................ 3
Tray Paper Detection.............................................................................................................................. 5
Side-to-side Registration Adjustment in the Optional Paper Tray......................................................... 7
2. Replacement and Adjustment ............................................................................................................ 8
Right Cover............................................................................................................................................. 8
Controller Board (PCB1)....................................................................................................................... 10
Bank Drive Motor (M1) ......................................................................................................................... 11
Bank Cooling Fan (FAN1).................................................................................................................... 12
Paper Size Switch (SW1)..................................................................................................................... 13
Paper Feed Clutch (CL1), Paper Transport Clutch (CL2).................................................................... 14
Paper End Sensor (S1)........................................................................................................................ 16
Paper Near-end Sensor (S2), Paper Transport Sensor (S3)............................................................... 17
Paper Feed Roller ................................................................................................................................ 18
Separation Roller.................................................................................................................................. 19

1.Detailed Descriptions
2
1.Detailed Descriptions
Overview
Mechanical Components
No.
Item
No.
Item
1
Controller board (PCB1)
7
Paper end sensor (S1)
2
Bank cooling fan (FAN1)
8
Paper transport roller
3
Bank drive motor (M1)
9
Friction roller
4
Paper transport clutch (CL2)
10
Paper transport sensor (S3)
5
Paper feed clutch (CL1)
11
Paper feed roller
6
Paper size switch (SW1)
12
Paper near-end sensor (S2)

1.Detailed Descriptions
3
Paper Feed Operation
Paper Feeding
The paper feed tray of the main machine employs the RF (Roller Friction) method for paper separation.
The RF mechanism comprises a separation roller with a torque limiter attached that forces paper
separation (no reverse drive is used).
A paper feed signal switches on the paper feed clutch (CL1) [A] and starts rotating the paper feed roller
[B] which feeds the paper. At the same time, switches on the paper transport clutch (CL2) [C] and starts
rotating the paper transport roller [D] which feeds the paper.
When the leading edge of the moving paper switches on the registration sensor, this switches the paper
feed clutch (CL1) and paper transport clutch (CL2) off. Image position timing starts while the registration
sensor is on, and then the paper is transported to the transfer unit.
The paper feed clutch (CL1) and paper transport clutch (CL2) are driven by the bank drive motor (M1)
[E].
In front of the feed roller [A] a pre-separation plate [B] is installed to block the top of the stack from
entering past the feed roller. The friction roller [C] separates the first sheet from the top of the stack so
only the top sheet feeds.

1.Detailed Descriptions
4
Bottom Plate Lift Mechanism
When a paper tray is set in the machine, a catch on the frame of the machine snags the bottom plate
lock lever [A] and releases it. When the lock is released, a spring raises the bottom plate [B] and paper
stack to the feed roller.
Also, the bottom plate and end fence are linked, so when the bottom tray rises, the end fence shifts
forward against the trailing edge of the stack. This keeps the edge of the stack against the fence to
prevent misfeeds.

1.Detailed Descriptions
5
Tray Paper Detection
Paper End/ Paper Near End Detection
When the tray runs out of paper, one end of the paper end feeler [A] drops through the cut out on the
bottom plate into the gap while the other end of the feeler pops up into the paper end sensor (S1) [B]
and turns it off. When paper end is detected, the paper out message is displayed on the operation
panel.
This machine is provided with a new paper near-end sensor.
A paper near-end feeler [C], installed on the corner of the bottom plate, detects the bottom plate as it
rises. As sheets of paper feed out, the bottom plate rises. This also raises the feeler of the paper near-
end sensor (S2) [D] until it blocks the gap of the sensor and switches it off. Paper near-end is detected
when there are about 75±50 sheets of paper (0.1 mm thick) remaining in the tray. When paper near-end
is detected, the operation panel displays the paper near-end message.
If paper end is detected before paper near-end, paper end takes precedence.
Paper Size Detection
When the paper tray is set in the machine, the paper size dial [A] installed on the right corner of the of
the tray pushes onto the three grooves of the paper size switch (SW1) [B]. This sets the reading for the
dial paper size setting. When more than one of these switches are set to "L" (ON") the machine knows
the paper tray is installed.

1.Detailed Descriptions
6
Value
SW 1
SW 2
SW 3
Paper size
1
L
L
L
A4 SEF
2
L
H
L
A5 SEF
3
H
L
L
A6 SEF
4
H
H
L
Legal SEF
5
L
L
H
Letter SEF
6
L
H
H
-
7
H
L
H
Half letter SEF
8
H
H
H
Paper cassette is not set.
L: Switch is pressed

1.Detailed Descriptions
7
Side-to-side Registration Adjustment in the Optional Paper
Tray
To adjust side-to-side registration, loosen the two screws on the underside of the tray and move the
rack and pinion mechanism of the side guides from side to side.
The holder [A] can move to right or left (up to 2mm). When at the default (±0) position, the holder
position is the triangle marked area.

2.Replacement and Adjustment
8
2.Replacement and Adjustment
The parts and components of the Paper Feed Unit PB1120 (500 sheets) and Paper Feed Unit PB1110
(250 sheets) are the same. The replacement procedures described below apply to both units.
Right Cover
The right cover can be removed with the main machine mounted on the paper feed unit.
1. Remove the paper cassette.
2. Remove the right cover [A].
Paper Feed Unit PB1110 (250 sheets):
Disconnect the boss, and then open the right cover by holding the bottom part of it to release two
hooks.
Paper Feed Unit PB1120 (500 sheets):
1. Disconnect the two bosses, and then open the right cover by holding the upper side of the right
cover to release two upper hooks.
2. Open the right cover with holding the bottom side of right cover to release three lower hooks.

2.Replacement and Adjustment
9

2.Replacement and Adjustment
10
Controller Board (PCB1)
1. Remove the right cover. (Right Cover)
2. Remove the controller board (PCB1) [A].

2.Replacement and Adjustment
11
Bank Drive Motor (M1)
1. Remove the right cover. (Right Cover)
2. Remove the bank drive motor (M1) [A].

2.Replacement and Adjustment
12
Bank Cooling Fan (FAN1)
1. Remove the right cover. (Right Cover)
2. Remove the bank cooling fan (FAN1) [A] with the bracket.
3. Remove the bank cooling fan (FAN1) [A] from the bracket.

2.Replacement and Adjustment
13
Paper Size Switch (SW1)
1. Remove the right cover. (Right Cover)
2. Remove the paper size switch (SW1) [A] with its bracket.
3. Deattach the paper size switch (SW1) [A] from the bracket.
4. Release the two hooks to to remove the paper size switch (SW1) [A].

2.Replacement and Adjustment
14
Paper Feed Clutch (CL1), Paper Transport Clutch (CL2)
1. Remove the right cover. (Right Cover)
2. Remove the paper size switch (SW1). (Paper Size Switch (SW1))
3. Release the clip to remove the bearing [B], and then remove the bracket [A].
4. Remove the paper feed clutch (CL1) [A].
5. Remove the bearing [A] and flange [B] to remove the paper transport clutch (CL2) [C].
When attaching the bracket removed in Step 3, make sure that the clutch connectors are seated
correctly on the holder.

2.Replacement and Adjustment
15

2.Replacement and Adjustment
16
Paper End Sensor (S1)
1. Remove the main machine from the paper feed unit.
2. Remove the paper cassette.
3. Remove the top cover [A].
4. Remove the paper end sensor (S1) [A].