Ricoh RT5120 Quick start guide

Vacuum Feed LCIT RT5120
Machine Code: D3EW
Field Service Manual
Ver 1.0
Latest Release: Feb, 2018
Initial Release: Feb, 2018
(c) 2018 Ricoh Co.,Ltd.

Symbols, Abbreviations
This manual uses several symbols and abbreviations. The meaning of those symbols and abbreviations
are as follows:
Symbol
What it means
Clip ring
Screw
Connector
Clamp
E-ring
Flat Flexible Cable
Timing Belt
SEF
Short Edge Feed
LEF
Long Edge Feed
K
Black
C
Cyan
M
Magenta
Y
Yellow
B/W, BW
Black and White
FC
Full color
[A] Short Edge Feed (SEF)
[B] Long Edge Feed (LEF)

1
Table of Contents
1. Replacement and Adjustment ............................................................................................................ 4
Exterior Covers....................................................................................................................................... 4
Right Upper Cover .............................................................................................................................. 4
Right Lower Cover .............................................................................................................................. 4
Rear Right Cover ................................................................................................................................ 5
Rear Left Cover .................................................................................................................................. 5
Left Top Cover .................................................................................................................................... 6
Center Top Cover ............................................................................................................................... 6
Right Top Cover.................................................................................................................................. 7
Front Corner Cover............................................................................................................................. 7
Top Cover ........................................................................................................................................... 8
Top Cover Interlock Switch............................................................................................................... 10
Rear Corner Cover ........................................................................................................................... 14
Front Door......................................................................................................................................... 14
Upper Inner Cover ............................................................................................................................ 15
Lower Inner Cover ............................................................................................................................ 16
Tray Front Cover (Tray 1, 2)............................................................................................................. 16
Paper Feed Unit (Trays 1, 2)................................................................................................................ 17
Paper Tray ........................................................................................................................................ 17
Paper Feed Belt Unit ........................................................................................................................ 17
Paper Feed Belt................................................................................................................................ 21
Paper End Sensor 1 ......................................................................................................................... 23
Paper End Sensor 2 ......................................................................................................................... 24
Suction Fan Shutter Solenoid........................................................................................................... 26
Paper Feed Sensor........................................................................................................................... 27
Transport Roller Unit......................................................................................................................... 29
Float/Separation/Return Fan Duct.................................................................................................... 29
Float/Separation/Return Fan Bracket............................................................................................... 32
Float Fan........................................................................................................................................... 35
Separation Fan ................................................................................................................................. 36
Return Fan........................................................................................................................................ 37
Float Fan Shutter Solenoid............................................................................................................... 39
Return Solenoid ................................................................................................................................ 40
Paper Upper Limit Sensor 1, 2 ......................................................................................................... 41
Paper Height Middle Sensor............................................................................................................. 44
Paper Lower Limit Sensor ................................................................................................................ 45
LCIT Paper Length Sensors 1 and 2................................................................................................ 47

2
Tray Upper Limit Sensor................................................................................................................... 48
Side Fences (Front, Rear) ................................................................................................................ 49
Paper Size Sensors.......................................................................................................................... 58
Side Fan............................................................................................................................................ 59
Rear Side.............................................................................................................................................. 60
Main Board........................................................................................................................................ 60
Motor Control Board ......................................................................................................................... 60
Tray 1 Pickup Belt Motor .................................................................................................................. 62
Tray 1 Grip Motor.............................................................................................................................. 65
Tray 2 Pickup Belt Motor .................................................................................................................. 66
Tray 2 Grip Motor.............................................................................................................................. 67
Suction Fan 1, 2 (Tray 1, 2).............................................................................................................. 68
LCIT Lift Motor (Tray 1, 2) ................................................................................................................ 69
Bypass Transport Motor 2 ................................................................................................................ 70
Transport Motor Cooling Fan............................................................................................................ 72
Vertical Feed Unit ................................................................................................................................. 74
Vertical Feed Unit ............................................................................................................................. 74
Tray 1 Vertical Transport Motor 1..................................................................................................... 76
Tray 1 Vertical Transport Motor 2..................................................................................................... 77
Tray 1 Transport Sensor................................................................................................................... 78
Tray 2 Vertical Transport Motor 1..................................................................................................... 79
Tray 2 Vertical Transport Motor 2..................................................................................................... 80
Tray 2 Vertical Transport Sensor...................................................................................................... 81
Tray 2 Transport Sensor................................................................................................................... 82
Vertical Transport Exit Motor ............................................................................................................ 83
Bypass Transport Sensor 2 .............................................................................................................. 84
LCIT Exit Motor................................................................................................................................. 85
LCIT Exit Roller Contact Motor......................................................................................................... 85
LCIT Exit Sensor............................................................................................................................... 87
LCIT Exit Roller Contact Sensor....................................................................................................... 87
Vertical Transport Unit Cooling Fan ................................................................................................. 88
Vertical Transport Entrance Contact Motor...................................................................................... 89
Tray 2 Vertical Transport Exit Contact Motor ................................................................................... 91
Tray 1 Vertical Transport Exit Contact Motor ................................................................................... 93
Tray 1 Vertical Transport Contact Motor .......................................................................................... 95
Vertical Transport Entrance Contact Sensor / Vertical Transport Entrance Sensor........................ 97
Tray 2 Vertical Transport Exit Contact Sensor................................................................................. 99
Tray 1 Vertical Transport Exit Contact Sensor............................................................................... 101
Tray 1 Vertical Transport Contact Sensor...................................................................................... 103

3
Jam Removal LED.......................................................................................................................... 105
PSU Box ............................................................................................................................................. 108
PSU box.......................................................................................................................................... 108
PSU1, 2, 3 / AC Drive Board .......................................................................................................... 109
PSU Cooling Fan 1, 2..................................................................................................................... 115
Interlock Switch............................................................................................................................... 116
2. Detailed Descriptions...................................................................................................................... 117
Overview............................................................................................................................................. 117
Specifications.................................................................................................................................. 117
Details................................................................................................................................................. 129
Air Paper Feed Mechanism ............................................................................................................ 129

1.Replacement and Adjustment
4
1. Replacement and Adjustment
Do not pull out all the trays while RT5120 is not docked to the main machine. Or the unit may topple.
Exterior Covers
Right Upper Cover
1. Open paper tray 1 slightly.
2. Remove the right upper cover [A]( x4)
Right Lower Cover
1. Open paper trays 1 and 2 slightly.
2. Remove the right lower cover [A] ( x5)

1.Replacement and Adjustment
5
Rear Right Cover
1. Lift the rear right cover [A] slightly and remove it ( x6).
When attaching the rear right cover, hang it on the hook.
Rear Left Cover
1. Remove the rear right cover (Rear Right Cover)
2. Lift the rear left cover [A] slightly and remove it ( x10).
When attaching the rear left cover, hang it on the hook.

1.Replacement and Adjustment
6
Left Top Cover
1. Cut the cushion at the position [A] along the groove.
2. Remove the screws on the left top cover ( x2).
3. Slide the left top cover [A] in the direction of the blue arrow and remove it.
Center Top Cover
1. Remove the left top cover (Left Top Cover)

1.Replacement and Adjustment
7
2. Slide the center top cover [A] in the direction of the blue arrow and remove it ( x3).
Right Top Cover
1. Remove the left top cover (Left Top Cover)
2. Remove the center top cover (Center Top Cover)
3. Remove the screws to slide the right top cover [A] in the direction of the arrow and remove it.
Front Corner Cover
1. Remove the left top cover (Left Top Cover)
2. Remove the center top cover (Center Top Cover)
3. Remove the right top cover (Right Top Cover)
4. Remove the screws at the top of the front corner cover ( x3).

1.Replacement and Adjustment
8
5. Remove the screws at the bottom of the front corner cover [A] ( x2).
6. Lift the front corner cover [A] and remove it.
Top Cover
1. Remove the right top cover (Right Top Cover)

1.Replacement and Adjustment
9
2. Remove the screws on the stay [A], and then remove the stay with the top cover.
3. Remove the plate from the top cover.

1.Replacement and Adjustment
10
Top Cover Interlock Switch
1. Remove the rear left cover. (Rear Left Cover)
2. Open the clamps on the left side of the main board to loosen the white/black harness [A], which
runs to the interlock switch.
Main board location [A]

1.Replacement and Adjustment
11
3. Loosen the white/black harness [A] on the upper side of the board.
By loosening the harnesses, you can pull out the bracket of the interlock switch more in the later
step, leading to facilitating the removal of the switches.
4. Remove the caps [A].
If Vacuum Feed Banner Sheet Tray Type S9 is installed, skip this step.
5. Remove the screws on the top cover.
If Vacuum Feed Banner Sheet Tray Type S9 is installed, skip this step.

1.Replacement and Adjustment
12
6. Open the top cover.
7. Pull tray 1 out.

1.Replacement and Adjustment
13
8. Remove the screws on the interlock switch bracket [A].
9. Pull the bracket slight to access the backside of it. Then, disconnect the connectors of the switches
to remove the bracket.
Each of white and black harness connectors is fixed as a pair. This prevents wrong-pair
connection.
10. Remove the screws on the switches [A] to detach them.
The three switches are installed adjoiningly and secured with the same screws.

1.Replacement and Adjustment
14
Rear Corner Cover
1. Remove the left top cover (Left Top Cover)
2. Remove the center top cover (Center Top Cover)
3. Remove the right top cover (Right Top Cover)
4. Remove the rear right and rear left covers (Rear Right Cover,Rear Left Cover).
5. Remove the rear corner cover [A]( x2)
Front Door
1. Remove the left top cover (Left Top Cover)
2. Remove the center top cover (Center Top Cover)
3. Remove the right top cover (Right Top Cover)
4. Remove the front corner cover (Front Corner Cover)

1.Replacement and Adjustment
15
5. Lift the front door [A] and remove it.
Upper Inner Cover
1. Open the front door.
2. Remove the two levers [A] ( x1 each).
3. Remove the knob [B] ( x1)
4. Raise the paper jam U9 clearing plate and remove the knob [A] ( x2).
5. Remove the three knobs [A] ( x1 each)

1.Replacement and Adjustment
16
6. Remove the upper inner cover [B] ( x5)
Lower Inner Cover
1. Open the front door.
2. Remove the lower inner cover [A] ( x3)
Tray Front Cover (Tray 1, 2)
The replacement procedures for the tray front covers of tray 1 and 2 are the same. The
following is the procedure for replacing the tray front cover of tray 1.
1. Pull out the paper tray.
2. Lift the tray front cover [A] and remove it ( x4).
The lower screw [B] is a shoulder screw.