Ricoh ps450 SPECIFICATIONS

PAPER TRAY UNIT

(Machine Code: B384)

20 February, 2001 MECHANICAL COMPONENT LAYOUT

1. OVERALL MACHINE INFORMATION

1.1 MECHANICAL COMPONENT LAYOUT

5

1

2

3

4

67

B384V101.WMF

1. Upper Paper Feed Roller

2. Lower Paper Feed Roller

3. Upper Tray

4. Lower Tray

5. Upper Bottom Plate

6. Lower Bottom Plate

7. Optional Tray Heater

Peripherals

B384-1

ELECTRICAL COMPONENT LAYOUT 20 February, 2001

1.2 ELECTRICAL COMPONENT LAYOUT

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2

3

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B384V102.WMF

1. Tray Main Board

2. Upper Lift Sensor

3. Upper Lift Motor

4. Upper Paper Height 2 Sensor

5. Upper Paper Height 1 Sensor

6. Upper Paper Feed Clutch

7. Relay Clutch

8. Tray Cover Switch

9. Lower Paper Feed Clutch

10. Lower Paper Height 2 Sensor

11. Lower Paper Height 1 Sensor

12. Vertical Transport Sensor

13. Upper Paper End Sensor

14. Lower Paper End Sensor

15. Lower Paper Size Switch

16. Upper Paper Size Switch

17. Optional Tray Heater

18. Lower Lift Motor

19. Lower Lift Sensor

20. Paper Feed Motor

B384-2

20 February, 2001 DRIVE LAYOUT

1.3 DRIVE LAYOUT

1

2

3

8

4

5

1. Paper Feed Motor

2. Drive Belt

3. Upper Paper Feed Clutch

4. Relay Clutch

6

7

B384V103.WMF

5. Lower Paper Feed Clutch

6. Relay Roller

7. Lower Paper Feed Roller

8. Upper Paper Feed Roller

Peripherals

B384-3

PAPER FEED AND SEPARATION MECHANISM 20 February, 2001

2. DETAILED DESCRIPTIONS

2.1 PAPER FEED AND SEPARATION MECHANISM

[A] [B]

[C]

B384D104.WMF

Each paper tray holds 500 sheets. The paper feed roller [A] drives the top sheet of
paper from the paper tray to the copier/printer. The friction pad [B] allows only one
sheet to feed at a time. The friction pad applies pressure to the feed roller with a
spring [C].

B384-4

20 February, 2001 PAPER LIFT MECHANISM

2.2 PAPER LIFT MECHANISM

[B]

[A]

[D]
[C]

[H]

B384D106.WMF

[E]

[C]

[D]

[E]

The paper size switch detects when the tray is pushed in.

[K]

[J]

[G]

[F]

[A]

[B]

[I]

B384D107.WMF

When the paper tray is pushed into the machine, the pin [A] for the lift motor
pressure shaft engages the lift motor coupling [B] and the pin [C] for the bottom
plate lift shaft in the tray engages the bottom plate pressure lever coupling [D]. The
pin [E] on the rear of the tray pushes the lock lever so that the lift motor can lift the
bottom plate pressure lever.

The lift motor turns on, and turns clockwise as viewed on the lower diagram. The
main pressure spring [K] pulls the bottom plate pressure lever, and this lifts the tray
bottom plate.

When the top of the stack touches the feed roller, the motor cannot pull up the
plate any more, so it pulls the actuator [G] into the lift sensor [F].

The pressure of the feed roller on the paper is now too high, so the lift motor
reverses to reduce this pressure. It reverses for 300 ms or 600 ms, depending on
the paper size. For smaller paper, it reverses the larger amount (600 ms) to reduce
the pressure more.

B384-5

Peripherals

PAPER LIFT MECHANISM 20 February, 2001

The lift motor reverse timing can be adjusted with SP mode, to change the
pressure from the main pressure spring.

• SP1-908-1 (1st tray), 1-908-2 (2nd tray)

• Default: 0

• Increase the pressure: +1, +2

• Decrease the pressure: –1, –2

If the pressure is too strong, the sheet of paper may not be fed smoothly, and if it is
too weak, more than one sheet of paper may be fed at a time.

For A4-LEF, A3-SEF, and B4-SEF paper, 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.

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.

B384-6

20 February, 2001 PAPER END DETECTION

2.3 PAPER END DETECTION

[A]

[B]

[C]

B384D105.WMF

If there is some paper in the paper tray, the paper stack raises the paper end feeler
[A] and the paper end sensor [B] is deactivated.

When the paper tray runs out of paper, the paper end feeler drops into the cutout
[C] in the tray bottom plate and the paper end sensor is activated.

When the paper tray is dra wn out with no paper in the tray, the shape of the paper
end feeler causes it to lift up.

Peripherals

B384-7

PAPER HEIGHT DETECTION 20 February, 2001

2.4 PAPER HEIGHT DETECTION

[B]
[A]

[C]

[C]

B384D107.WMF

The amount of paper in the tray is detected by the combination of on/off signals
from two paper height sensors [A] and [B].

When the am ount of paper decreases, the bottom plate pressure lever [C ] moves
the actuator up.

The following combination of sensor signals is sent to the copier/printer.

Amount of Paper Paper Height Sens or 1 Paper Height Sensor 2

Near End OFF ON

30% ON ON
70% ON OFF
100% OFF OFF

When the tray contains paper of a small width, the paper feed pressure may
become too low when the thickness of the remaining stack of paper has
decreased. The lift motor rotates forward 300 ms after the sensor detects a certain
amount of paper remaining in the tray to increase paper feed pressure, simulating
the pressure generated by a full tray.

B384-8

20 February, 2001 PAPER SIZE DETECTION

PAPER SIZE DETECTION

[B]

SW

Size

1/2

1/2

1/2

" x 14"

" x 11"

1/2

" x 13")

"

A3, F (8
A4 short- edge
A4 long-edge
A5 long-edge

11" x 17"
B4, 8
B5 long-edge,
8
B5 short- edge,

11" x 8
* (Asterisk)

1234

❍❍❍❍

""
""

❍❍

"

"

❍

❍

❍: ON (Pushed)

"

: OFF (Not pushed)

❍❍
❍

""

"

❍

❍❍❍

"""

"

❍

"

[A]

❍

"

B384D108.WMF

There are four paper size microswitches [A] on the front right plate of the paper tray
unit. The switches are actuated by a paper size actuator [B] behind the paper size
indicator plate, which is on the front right of the tray.

Each paper size has its own actuator, with a unique combination of notches. To
determine which size has been installed, the CPU reads which microswitches the
actuator has switched off.

The CPU disables paper feed from a tray if the paper size cannot be detected. If
the paper size actuator is broken, or if there is no tray installed, the Add Paper
indicator will light.

When the paper size actuator is at the “*” mark, the paper tray can be set up to
accommodate one of a wider range of paper sizes by using user tools. If the paper
size for this position is changed without changing the user tool setting, a paper jam
will result.

Peripherals

B384-9

SIDE AND END FENCES 20 February, 2001

2.5 SIDE AND END FENCES

[A]

[D]

[B]

B384D110.WMF

[C]

B384D109.WMF

Side Fences

If the tray is full of paper and it is pushed in strongly, the fences may deform or
bend. This may cause the paper to skew or the side-to-side registration to be
incorrect. To correct this, each side fence has a stopper [A] attached to it. Each
side fence can be secured with a screw [B], for customers who do not want to
change the paper size.

End Fence

As the amount of paper in the tray decreases, the bottom plate [C] lifts up
gradually. The end fence [D] is connected to the bottom plate. When the tray
bottom plate rises, the end fence moves forward and pushes the back of the paper
stack to keep it squared up.

B384-10

20 February, 2001 FEED ROLLER REPLACEMENT

3. REPLACEMENT AND ADJUSTMENT

3.1 FEED ROLLER REPLACEMENT

[C]

[B]

B384R723.WMF

1. [A] Paper tray

2. Move the release lever [B] to the front.

3. Pull the feed roller [C] to the operation side and remove it.

[A]

Peripherals

B384-11

TRAY MAIN BOARD REPLACEMENT 20 February, 2001

[A]

B384R101.WMF

[B]

[C]

3.2 TRAY MAIN BOARD REPLACEMENT

1. [A] Rear cover (! x 5)

2. [B] Tray main board (! x 4, " x 8)

3.3 PAPER FEED MOTOR REPLACEMENT

1. Rear cover (! x 5)

2. Disconnect 8 connectors from the tray main board [B].

3. Tray main board with the bracket (! x 2)

4. [C] Paper feed motor (! x 6, " x 1)

B384R103.WMF

B384-12

20 February, 2001 RELAY CLUTCH REPLACEMENT

3.4 RELAY CLUTCH REPLACEMENT

[A]

[B]

B384R101.WMF

1. [A] Rear cover (! x 5)

2. [B] Right cover (! x 2)

3. [C] Stopper bracket (! x 1)

4. [D] Bushing

5. [E] Relay clutch (" x 1)

[D]

[C]

[E]

B384R102.WMF

Peripherals

B384-13

UPPER PAPER FEED CLUTCH REPLACEMENT 20 February, 2001

3.5 UPPER PAPER FEED CLUTCH REPLACEMENT

[A]

B384R101.WMF

1. [A] Rear cover (! x 5)

2. [B] Bracket (! x 2)

[B]

[D]

[C]

[E]

B384R102.WMF

3. [C] Stopper bracket (! x 2)

4. [D] Bushing

5. [E] Upper paper feed clutch (" x 1)

B384-14

20 February, 2001 LOWER PAPER FEED CLUTCH REPLACEMENT

3.6 LOWER PAPER FEED CLUTCH REPLACEMENT

[A]

B384R101.WMF

1. [A] Rear cover (! x 5)

2. [B] Snap ring

3. [C] Lower paper feed clutch

[C]

[B]

B384R102.WMF

Peripherals

B384-15

LIFT MOTOR REPLACEMENT 20 February, 2001

3.7 LIFT MOTOR REPLACEMENT

[A]

B384R101.WMF

[C]

1. Pull out the paper tray.

2. [A] Rear cover (! x 5)

3. [B] 2P connector

4. [C] Spring

5. [D] Lift motor unit (! x 3)

6. [E] Lift motor (! x 3)

[D]

[B]

[E]

B384R104.WMF

B384-16

20 February, 2001 PAPER END SENSOR REPLACEMENT

3.8 PAPER END SENSOR REPLACEMENT

[C]

[B]

[A]

B384R106.WMF

1. Paper tray

2. [A] Paper end sensor bracket (! x 1, " x 1)

3. [B] Paper end sensor
NOTE: After replacing the sensor, pull the sensor cable towards the right side of

the frame [C] so that it does not touch the paper in the tray.

3.9 VERTICAL TRANSPORT SENSOR REPLACEMENT

[C]

[D]

[B]

[A]

Peripherals

B384R105.WMF

1. Open the right door [A].

2. [B] Right guide plate (! x 2)

3. [C] Vertical transport sensor bracket (! x 1, " x 1)

4. [D] Vertical transport sensor

B384-17

PAPER SIZE SWITCH REPLACEMENT 20 February, 2001

3.10 PAPER SIZE SWITCH REPLACEMENT

[B]

[A]

1. Upper and lower paper trays

2. [A] Inner cover (! x 2)

3. [B] Paper size switch (" x 1)

B384R108.WMF

B384-18

ELECTRICAL COMPONENT LAYOUT (B384)

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B384V102.WMF

Symbol Name Index No. P-to-P

Motors

M1 Paper Feed 20 E12
M2 Lower Lift 18 E13
M3 Upper Lift 3 E13

Sensors

S1 Lower Paper Height 2 10 E8
S2 Lower Paper Height 1 11 E9
S3 Upper Paper Height 2 4 E9
S4 Upper Paper Height 1 5 E9
S5 Vertical Transport 12 E10
S6 Lower Paper End 14 E10
S7 Upper Paper End 13 E11
S8 Lower Lift 19 E13
S9 Upper Lift 2 E13

Switches

SW1 Upper Paper Size 16 E9
SW2 Lower Paper Size 15 E10
SW3 Tray Cover 8 E11

Magnetic Clutches

MC1 Upper Paper Feed 6 E11
MC2 Relay 7 E11
MC3 Lower Paper Feed 9 E12

PCBs

PCB1 Tray Main 1 D9-13

Others

H1 Optional Tray Heater 17 E14