Ricoh LT4000 SPECIFICATIONS

LARGE CAPACITY TRAY

LT4000

(C563)

15 June 1995 OVERALL MACHINE INFORMATION

1. OVERALL MACHINE INFORMATION

1.1 S PECIFICATIONS

Paper Size: The following sizes can be placed in the large

capacity tray and the LCT cassette .
A3 M, B4 M, A4 LM, B5 LM, A5 M,
11" x 17" M, 81/2 x 14" M, 81/2" x 11"
In addition, the following size can be pla ced in
the LCT cassette.
A6 M.

Paper Capacity: LCT: 4,000 sheets (64 g/m2, 17 lb)

3,000 sheets (80 g/m2, 20 lb)
Cassette: 500 she ets (64 g/m2, 17 lb)
400 sheets (80 g/m2, 20 lb)

Copy Paper Weight 47.1 g/m2 to 209.3 g/m2, 12.5 lb to 55.6 lb

ML

Power Source: (DC) 24 V, 5 V
Power Consumption: Less than 100W
Weight: Less than 37 kg, 82 lb
Dimensions:

(W x D x H)
Image Shifting:

550 x 500 x 688 mm, 21.7" x 19.7" x 27.1"

±10 mm (±3 mm if the optional sorter is
installed)

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OVERALL MACHINE INFORMATION 15 June 1995

1.2 ME CHANI CAL COMP ONE NT LAYO UT

1

3

4

1. Bottom Plate

2. Tray Drive Belt

3. Tray Drive Motor

4. Tray Shift Motor

5. Feed Unit Base

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C563V500.wmf

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15 June 1995 OVERALL MACHINE INFORMATION

1.3 E LECTRI CAL CO MPO NENT DE SCRI P TI ON

Refer to the electrical compone nt layou t on the reverse side of the
point-to-point diagram (on the waterproof paper).

Index.

No.

Sensors

1 Cassette Size Determines what size paper is in the cassette.
3 Paper Length Detects the paper length.

Maximum Paper Load Informs the printer CPU when the LCT bottom

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10 Paper Size 0 Determines what paper size is in the tray.
11 Paper Size 1 Determines what paper size is in the tray.
12 Paper Size 2 Determines what paper size is in the tray.
13 Paper Size 3 Determines what paper size is in the tray.

Tray Lower limit Turns off the tray drive motor when the tray

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20 LCT Paper End Detects the presence of paper in the LCT.
21 Cassette Paper End Detects the presence of paper in the cassette.

Tray Paper Position Detects the top of the LCT tray or the paper stack

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Switches

Cassette Informs the printer CPU when the cassette is

2
4 Cover Open Detects if the LCT cover is open or not.

Rear Shift Limit Cuts the line to the tray shift motor when the feed

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Front Shift limit Cuts the line to the tray shift motor when the feed

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Tray Down The LCT bottom plate lowers when the user

16

Image Position The tray shift motor moves forward or in reverse

19

Description Note

plate is at the lowest position for loading paper,
and that no more can be loaded.

reaches the lowest possible position (for loading
the cassette).

when adding paper.

installed.

unit base reaches the rear end.
unit base reaches the front end.
presses this.
when the user presses this.

Motors

Tray Drive Lifts the LCT bottom plate to bring paper to the

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Tray Shift Shifts the feed unit base from front to rear to shift

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18 Cassette Bottom Plate Drive Lifts the cassette bottom plate.

PCBs

15 I/O Control Controls all the LCT operations.

feed position and and lowers it to allow paper to
be loaded.

the LCT bottom plate, in order to shift the image
position.

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OVERALL MACHINE INFORMATION 15 June 1995

1.4 BAS IC OP ERATION

[F]

[G]

[A]

[G, I]

[H]

[E]

[B]

[C]

[D]

[I]

C563V502.wmf

- Overview -

The LCT bottom plate [A] is lifted up and down by th e tra y drive mot or (a
reversible motor) [B]. Drive from the tra y drive mot or is tran smitted through
the worm gear [C], worm wheel, drive pulley [D] to the drive belts [E ]. The
drive belts connect the ends of the LCT botto m plate.

The bottom plate is con tro lled so that the top of the pap er sta ck is in one of
two basic positions: the paper feed position or the sta ndby position. The
paper feed position is used during print ing , an d at all oth er time s, th e sta nd by
position is used. When the top of the pa pe r stack is in the stan dby position,
there is enough room for the user to add about 1,000 sheets of paper.

- Power-up -

When the main switch is turned on, the tray drive motor lifts the LCT botto m
plate until the top of the paper stack is at the stan dby position. This is the
initialization procedure for the bottom plate position.

The bottom plate is lifted until the top sheet pu she s up th e feed roller and th e
paper table height sen sor in th e main body is de-actuated (this is th e pape r
feed position; refer to "Printing" below for more de tails). The n, the tray drive
motor lowers the bottom pla te until the top of the paper stack just passe s the

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15 June 1995 OVERALL MACHINE INFORMATION

tray paper position sensor [ F] (a phot oco up ler), wh ich turns of f at this time .
This is the standby position.

If there is no paper or only a small amount of paper on the bottom plate, the
tray paper position senso r t urn s o n th en off soon aft er (be cause the bottom
plate passes the sensor), before the top shee t pushes up the feed roller.
When this happens, the bottom plate stops rising immed iat ely and is lowere d
until the top of the pape r stack comes to the standby position (th e tray paper
position sensor turns on th en back of f again). This process allows
initialization to be completed more quickly.

- Printing -

When the Print Start key is pressed, the bot to m plat e starts rising from the
standby position. It stop s when the top shee t pushes the paper feed roller
and the paper table heig ht sensor in the main body is deactu at ed (t his is the
paper feed position ). The machine can now start to feed.

As pages are printed, the top sheet posit ion beco mes lower, and eventually
the main body’s paper table he igh t sensor is actuated. When th is hap pe ns,
the tray drive motor raises the bottom plate until the paper height sensor is
de-actuated again; this kee ps th e to p she et at th e paper f eed po sitio n.

When a printing job finishes or a paper misfeed occurs, the tray drive motor
slightly lowers the bottom plate (for 500 ms). If the tray paper posit ion sensor
turns off (this is possible whe n th ere is only a small a mou nt of pape r on th e
bottom plate an d the paper stack is in between th e sensor and the paper
feed roller), the bottom pla te moves do wn un til th e tra y pap er po sitio n sen sor
is just activated by the bottom plate. This is to allow the user to add pap er. It
is not possible to add paper by pressing the tray down switch if th e tra y pap er
position sensor remains off (refe r to the Addin g Pape r sectio n below).

Unlike after a normal printing job, after a pro of print ing job mad e with the
Proof Printing key fin ishe s (o ne sh eet is f ed each time th e Proof Printing key
is pressed), the bottom pla te is not lowe red. This is to save time for the top
sheet to reach the paper feed position when the next job starts.

If paper runs out during printing , th e pape r end cond itio n is det ect ed by the
LCT paper end sensor (a photoco upler). The bottom plate moves down until
the tray paper position sensor turns on then off (it stops in the standby
position). Then, the user can add some pa per.

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OVERALL MACHINE INFORMATION 15 June 1995

- Adding Paper -

The bottom plate can be lowered by pre ssing the tray down switch only when
the tray paper position senso r turn s on. This is becau se if the sensor stays
off, the top of the paper stack (or the bottom plate if there is no paper) is in
the standby position. The user can add paper without lowering the bottom
plate in this case.

When the top of the paper stack is above th e tray paper position sensor (the
sensor is On) and the tray down switch is pressed , the tray drive motor
lowers the bottom plate until the top sheet of the remain ing paper stack just
passes the tray paper position sensor (the sensor turns off). This gives
enough space for the user to add about 1,000 sheets of paper.

If the tray down switch is the n pre ssed again after adding pap er (th e tra y
paper position sensor comes on), the botto m plate moves down and again
stops once the top sheet just passes the tray paper position sensor. This
operation can be repeated until the maximum paper load sensor [G] is
actuated by the actuator [H] on the bottom plate. Then, the bottom plate
cannot be lowered any more and no more paper can be added.

- Installing the Cassette -

When the tray down switch is pressed for aro und 2 seco nd s (when the user
wants to load the cassett e), the bottom plate lowers until the tray lowe r limit
sensor [I] detects the actuator on bottom plate.

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15 June 1995 DETAILED SECTION DESCRIPTIONS

2. DETAILED SECTION DESCRIPTIONS

2.1 TRAY SHI FT MECHANISM

[A]

[B]

[C]

c563d500.wmf

[D]

Image shifting is carried out by shift ing the LCT unit to the fro nt or to th e rea r.
When the image position switch [A ] is mo ved to the fro nt , th e tray sh ift moto r
(a reversible motor) [B] rot ates counterclockwise to rotate the shift shaf t [C]
clockwise. The shaft moves the feed unit base [D] of the LCT unit to the rear.
Thus, the image is shifted to the front.

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