HP t120, t520 Service Manual

DESIGNJET T120/T520 ePrinter Series

Service Manual

1st edition, August 2012

Legal notices

This document contains proprietary information that is protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Hewlett-Packard Company.

Notices

Warranty

The information contained in this document is subject to change without notice.

Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

WARNING

The procedures described in this manual are to be performed by HP-qualified service personnel only.

Electrical Shock Hazard

Serious shock hazard leading to death or injury may result if you do not take the following precautions:

Ensure that the AC power outlet (mains)

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has a protective earth (ground) terminal.

Disconnect the printer from the power

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source prior to performing any maintenance.

Prevent water or any other liquids from

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running onto electrical components or circuits, or through openings in the enclosure.

Electrostatic Discharge

See the beginning of Chapter 4's

Introduction on page 143 of this manual, for

precautions you should take to prevent damage to the printer circuits from electrostatic discharge.

WARNING

The Warning symbol calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a Warning symbol until the indicated conditions are fully understood and met.

CAUTION

The Caution symbol calls attention to an operating procedure, practice, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the printer. Do not proceed beyond a Caution symbol until the indicated conditions are fully understood and met.

Customer Assurance

Customer Experience Section

Large Format Printing Division

Hewlett-Packard Española, S.A.

Avenida Graells, 501

08174 Sant Cugat del Vallès

Spain

Safety Symbols

General definitions of safety symbols are given immediately after the table of contents.

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Using this manual

This service manual contains information necessary to test, maintain, and service the following:

HP Designjet T120 Basic Printer 24 inch CQ891A

HP Designjet T520 Pro Printer 24 inch CQ890A

HP Designjet T520 Pro Printer 36 inch CQ893A

For information about using these printers, see the user's guide.

Readership

The procedures described in this service manual are to be performed by HP Certified service personnel only.

Part numbers

Part numbers for printer service parts are located in

Parts and diagrams on page 126.

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vi Using this manual ENWW

Table of contents

1 Printer fundamentals ........................................................................................................ 1

Overview ................................................................................................................................ 1

Using the front panel ................................................................................................................ 2

Start-up sequence ..................................................................................................................... 3

Subsystems .............................................................................................................................. 5

2 Troubleshooting .............................................................................................................. 34

Printer troubleshooting flowchart .............................................................................................. 35

Basic printer troubleshooting ................................................................................................... 36

System error codes ................................................................................................................. 39

Paper troubleshooting ............................................................................................................. 61

Communication troubleshooting ............................................................................................... 66

Ink-supplies troubleshooting ..................................................................................................... 70

Print-quality troubleshooting ..................................................................................................... 83

Update the firmware ............................................................................................................... 97

3 Support menus ............................................................................................................. 101

Entering the support menus .................................................................................................... 102

Support menu ...................................................................................................................... 104

Extended Support menu ........................................................................................................ 124

4 Parts and diagrams ...................................................................................................... 126

Introduction ......................................................................................................................... 126

Printer support ..................................................................................................................... 127

Covers ................................................................................................................................ 128

Roll covers .......................................................................................................................... 129

Right-hand assemblies ........................................................................................................... 130

Left-hand assemblies ............................................................................................................. 132

Carriage assembly ............................................................................................................... 134

Paper path (front) ................................................................................................................. 136

Paper path (rear) ................................................................................................................. 137

Roll supports ........................................................................................................................ 138

Sensor Kit ........................................................................................................................... 139

Miscellaneous parts .............................................................................................................. 140

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5 Removal and installation .............................................................................................. 141

Introduction ......................................................................................................................... 143

Customer Self Repair parts .................................................................................................... 145

Videos available .................................................................................................................. 146

Recommended checks after replacing parts ............................................................................. 146

Top Cover ........................................................................................................................... 147

Front Cover ......................................................................................................................... 150

Right Cover ......................................................................................................................... 153

Ink Cartridge Cover .............................................................................................................. 156

Left Cover ........................................................................................................................... 158

Roll Cover ........................................................................................................................... 160

Back Cover ......................................................................................................................... 163

Front Panel .......................................................................................................................... 165

Front Panel Cable ................................................................................................................ 171

Central Cover ...................................................................................................................... 172

Upper-Roll Paper Guide ........................................................................................................ 177

Left Roll Support ................................................................................................................... 180

Right Roll Support ................................................................................................................. 185

Top Cover Sensor ................................................................................................................ 188

Top Cover Sensor Cable ....................................................................................................... 191

Encoder Strip ....................................................................................................................... 193

Ink Cartridge Cover PCA Assembly ........................................................................................ 198

Power Supply ...................................................................................................................... 202

Main PCA ........................................................................................................................... 205

Paper Motor ........................................................................................................................ 211

Encoder PCA and Index ........................................................................................................ 213

Encoder Disk ....................................................................................................................... 217

Trailing Cable ..................................................................................................................... 220

Service Station ..................................................................................................................... 227

Prime Pump ......................................................................................................................... 233

Carriage and Belt ................................................................................................................ 236

Carriage Belt ....................................................................................................................... 243

Right Gear Train Module ...................................................................................................... 245

Starwheel Assembly ............................................................................................................. 247

Output Shaft ........................................................................................................................ 249

Output Tray ......................................................................................................................... 257

Multi-Sheet Tray Assembly ..................................................................................................... 260

Multi-Sheet Tray Assembly Extensions ..................................................................................... 261

Output Platen ...................................................................................................................... 263

Carriage Motor ................................................................................................................... 268

Cutter Assembly ................................................................................................................... 272

Cutter Guide ....................................................................................................................... 279

Out-Of-Paper Sensor ............................................................................................................. 281

Out-Of-Paper Sensor Cable ................................................................................................... 284

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Output Tray Sensor Assembly ................................................................................................ 286

Output Tray Extender Sensor Cable ........................................................................................ 289

Carriage Line Sensor ............................................................................................................ 293

Bundle Board ...................................................................................................................... 297

Bundle Board FFC cable ....................................................................................................... 299

Pinchwheels ........................................................................................................................ 304

Left Spittoon ........................................................................................................................ 310

6 Preventive maintenance ............................................................................................... 313

Preventive maintenance ........................................................................................................ 314

Preventive maintenance kits ................................................................................................... 320

7 Appendices ................................................................................................................... 323

Important links ..................................................................................................................... 324

Front-panel home screen and menu map ................................................................................. 325

Support menu tree ................................................................................................................ 335

Extended Support menu tree .................................................................................................. 336

How to check whether your computer is connected to your network ............................................ 337

Wireless troubleshooting report error cases ............................................................................. 340

CSR fliers ............................................................................................................................ 351

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1 Printer fundamentals

Overview

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Using the front panel

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Start-up sequence

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Subsystems

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Overview

Feature HP Designjet T120 HP Designjet T520 More information

Paper source Roll and multi-sheet tray See the user's guide

Hardware differences Stand as an accessory, no

roll cover

Connectivity Wi-Fi, Fast Ethernet LAN, USB Important! LAN and Wi-Fi are

Web Services Automatic firmware upgrade

HP Designjet ePrint & Share

Printing by email

Speed 70 s per page on A1/D 35 s per page on A1/D

Resolution Up to 1200 × 1200 dpi Up to 1200 × 2400 dpi

Memory and languages 256 MB, HP-PCL3

(processing in printer)

Supplies HP 711 29 ml Cyan, Magenta, Yellow

HP 711 38 ml and 80 ml Black

Stand in box, roll cover

1 GB, HP-GL/2 (processing in computer)

not compatible

The printer needs to be Internet-connected: Web Services do not work with a USB connection. For some configurations, the latest firmware release is needed. Manual firmware upgrade is available in both printers via HP Designjet Utility (Windows) or HP Utility (Mac OS). The same firmware file is used for T120 and T520.

Ink cartridges and printhead can be replaced by the customer.

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One on-axis printhead for all colors

Overview

Using the front panel

The front panel is a touch-sensitive screen with a graphical user interface; it is located on the front left of the printer. It gives you complete control of your printer: from the front panel, you can print, view information about the printer, change printer settings, perform calibrations and tests, and so on. The front panel also displays alerts (warning and error messages) when needed.

The front panel has a large central area to display dynamic information and icons. On the left and right sides you can see up to six fixed icons at different times. Normally they are not all displayed at the same time.

To the right of the front panel is the Power key, with which you can turn the printer on or off. The key is illuminated when the printer is on. It flashes when the printer is in transition between on and off.

Left and right fixed icons

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Home screen dynamic icons

The following items are displayed only on the home screen.

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shows the status of the wireless connection: if the blue light is shining, the wireless connection is

active.

Press

At the top left of the home screen is a message telling you which paper source is active.

Press

Press cable is connected,

to return to the home screen.

to view help about the current screen.

to go to the previous item.

to go to the next item.

to go back to the previous screen.

to cancel the current process.

to view Web Services status and display your printer’s email address.

to view connectivity status information and to perform network configuration. If a network

is displayed instead.

NOTE: It is not possible to use wireless and wired network connections simultaneously.

Press

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to view ink information.

Press

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to change printer settings.

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Press

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Press

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Press

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Press

to load, unload, and change options for roll paper.

to change options for the multi-sheet tray, or to activate it.

to load, unload, and change options for single sheets.

to access HP Designjet ePrint & Share.

NOTE: The active paper source is indicated by a slightly larger icon, with a white tick in a green

circle:

If the printer is left idle for some time, it goes into sleep mode and switches off the front-panel display. To change the time that elapses before sleep mode, press

, then Printer preferences > Sleep.

You can set a time between 5 and 240 minutes.

The printer wakes from sleep mode and switches on the front-panel display whenever there is some external interaction with it.

The following table shows an overview of the two types of support menu available, for more details see

Entering the support menus on page 102.

NOTE: The icons mentioned in this table will not be visible in the front panel: you must press the front

panel in the places where they normally appear, as shown in the front panel illustration at the start of this section.

Label Description

Support menu: This can be used by customers under the

guidance of phone call agents assisting remotely. Using this menu, customers can perform troubleshooting tasks and access printer information.

Extended Support menu: Service engineers only From the Home screen, press the following icons one after the

Start-up sequence

There are three states between power-on and the Home screen:

1. Electronics initialization

2. Firmware initialization

From the Home screen, press the following icons one after the other:

If there is a system error, you may not be able to reach the home screen. In this case, press the Power button and hold it down for 15 seconds.

other:

, , , .

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3. Mechanical initialization

Start-up sequence

State 1: Electronics initialization

1. The front panel moves from flashing white light to turning dark.

2. The printer reads the firmware.

NOTE: At this stage, if something is broken, it will not be possible to enter the Support menu. To

diagnose what is happening, go to the front panel blank troubleshooting. (and add here the link). Subsequently, you can enter the Support menu to troubleshoot if necessary.

State 2: Firmware initialization

1. The HP logo appears with a static bar.

2. Bundle board and ASICs are initialized.

3. The HP logo changes.

State 3: Mechanical initialization

1. A basic check of servos

2. A check that the Scan Axis and Paper Axis are unobstructed by scraps of paper or other items

3. Paper and print system initialization

Initialization flow summary

Time (sec) Printer state Visual and acoustic information

0 Power on Using the Power button

10 Electronics initialization

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Time (sec) Printer state Visual and acoustic information

27 Mechanical initialization

1. Basic check of servos Sound of the printer's motors

2. Scan Axis, Paper Axis check Carriage movement

3. Paper and print system initialization Paper movement

45 Ready state

NOTE: Initialization lasts around 45 s if there was a clean power-off (using the front panel Power

button). If there was a dirty power-off, the printer will require more time to inititialize (to ensure that the printhead is in a good state).

Subsystems

Covers

Functionality

These parts cover the printing mechanism and act as protection from potential knocks or dust. They also prevent the customer from coming into contact with unsafe parts during the operation of the printer. Finally, the covers complement the style and aesthetics of the printer.

The T120 and T520 printers have covers of different colors, and a different configuration of the roll cover, as seen in the following table:

HP Designjet T120 HP Designjet T520

Roll Cover Not Present Transparent

Top Cover Opaque Black Transparent

Output Platen Black-Blackberry Black-Olive

Output Tray Black-Olive Black-Olive

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Subsystems

Components

Other than the cosmetic aspects of the covers, there are several sensors related to the subsystem covers. The sensors are designed to detect the status of the cover, open or closed.

The Ink Cartridge Cover Sensor senses whether the Ink Cartridge Cover is open or closed.

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Opening the Ink Cartridge Cover starts ink cartridge replacement automatically. The sensor is hosted in the printer chassis.

The Central Cover hosts the Top Cover Sensor to sense whether the Top Cover is open or closed.

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IMPORTANT: Be careful to avoid damaging the sensor while removing the Central Cover. See

Central Cover on page 172.

The Output Tray Sensor senses whether the Output Tray is open or closed. To avoid paper jams

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while printing on roll paper, the tray should be closed.

IMPORTANT: Damage to the covers can cause the sensors to malfunction.

Removal and installation

In order to proceed with the removal and installation of the covers its important to bear in mind their cosmetic aspects, some surfaces of the covers have a glossy finish, which requires maximum attention as they are very delicate and susceptible to scratches and finger marks. It is recommended that you use gloves for any service operation involving the covers.

Due to the layout of the covers, it is important to bear in mind that some parts require removal before you can remove a specific cover.

Right Cover requires Front Cover removal.

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Left Cover requires Front and Ink Cartridge Cover removal.

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Roll Cover requires Right and Left Cover removal.

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Top Cover requires Front Panel assembly removal.

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Central Cover requires Right Cover and Left Cover removal.

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Related tests

Sensor tests for the Top Cover, Ink Cartridge Cover, and Output Tray operation. See Diagnostics menu

on page 106.

Electronics

Other than the sensor boards, there are no electronics related to this subsystem.

Printhead health systems: Service Station, Primer system, and Left Spittoon

Functionality

The service station is responsible for printhead maintenance. It takes action to clean ink residues and service ink nozzles, and prevents ink from drying in critical zones by capping the printhead once printing has finished.

The Primer system provides the necessary air pressure to the printhead to perform initialization. This system also provides pressure to the necessary printhead service operations (by boosting air which pushes ink out through the printhead nozzles, cleaning residues of dried ink and other particles).

The Left spittoon is a small container located to the left of the print-zone area, this is the area used by the printhead to “spit” a small amount of ink at the end/beginning of the printing swath in order to ensure correct nozzle heath for left-to-right printing.

Components

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Subsystems

Item Function

Off-axis coupling assembly This is a rubber spring link located on the side plate of the

Prime Pump This is an air pump which provides the necessary pressure for

Primer Tubes The tubes take the air from the Prime Pump to the off-axis

Notes and considerations

scan axis (area where the Carriage moves). It links the primer system with the Carriage when the Carriage is located in its maximum left position. This system ensures the pressure from the primer reaches the printhead for nozzle servicing.

printhead servicing and nozzle repair. The Prime Pump is suspended on a rubber holder to minimize the noise that the Prime Pump makes while in operation.

coupling. There is a T link feature connected to a tube that goes inside the service station; the purpose of this tube is to release the air pressure from the system. The tube is pinched by the shuttle of the service station when reaching a certain position; this action closes the circuit and allows the system to be pressurized. With the movement of the service station the tube is released, allowing the pressure from the system to escape.

Any leakage in the primer system will generate poor or no priming, this will affect nozzle heath (or even cause the printhead startup to fail). Bear in mind that the system is not just for the Prime Pump and tubes, the prime pressure is transmitted via the off-axis coupling to the Carriage and from there to the printhead assembly and from there to the cartridges.

NOTE: There is no pressure sensor in the system. The Prime Pump operates at a certain time to reach

a specific pressure level, the system is depressurized by releasing the pinching of the release tube in the Service Station (by moving the service station).

NOTE: It is important to ensure the Carriage reaches the maximum left position; if not, the off-axis

coupling will not connect the Prime Pump with the Carriage. Also, the coupling is made of a rubbery material, degradation of the material will affect Primer performance due to air leaks.

Electronics

The control driver of the Prime Pump is located on the remote controller board located on the right-hand side of the printer. There is no encoder for the Prime Pump. This pump is managed only by a DC motor activated for a certain period of time to create the required priming pressure.

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Service Station system

Functionality

Item Function

Printhead Wipers These are rubber paddles that are passed through the nozzle

plate of the printhead with the Service Station movement. They clean the excess ink from the nozzle plate with a rubbing action.

Printhead Cap This caps and protects the nozzles from drying when they are

not printing.

Service Station Motor system This moves the shuttle with the wiper and the cap so that these

two items can perform their functions. The system is composed of a DC motor and an encoder disk with an encoder sensor to read the motor position.

Bottom Spittoon This part acts as an ink reservoir when spitting and nozzle

health operations are performed. It contains diapers that prevent the ink becoming liquid.

Top Spittoon This seals the reservoir and completes the main body of the

service station.

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Subsystems

Item Function

Absorber Base This is made of foam and is located under the service station

Wiper Shuttle This mobile part is propelled by the motor that contains the

Notes and considerations

The service station is offered as a complete service part for full replacement. The failures from this subsystem are usually related to the mobile parts: motor or encoder failures that prevent the shuttle from reaching the positions for capping or uncapping.

on top of the printer structure. It works as an additional diaper in case ink spills out of the Service Station.

Wiper and Cap. Depending on the position, spitting, wiping, capping, or priming can take place:

Spitting: The printhead “spits” a little ink into the spittoon to get the nozzles conditioned and ready for the next swath of printing.

Wiping: A physical action to pass the rubber wipers through the printhead nozzles.

Capping: Parking the printhead to maintain nozzle heath during printer inactivity, with a surrounding seal.

Priming: Squirts ink through the nozzles to clean and unblock them.

With the life primer system, tube pinching can present an issue (although it is designed to function for the life of the printer).

When the Service Station is replaced, it is mandatory to reset the Preventive Maintenance Kit for the Service Station, this will trigger a simple calibration that is done with the Service Station on the next printer startup. The calibration measures the length of the Service Station (shuttle front bump to shuttle rear bump), which ensures a correct capping position.

Electronics

All the controlled movements for the Service Station are done from the remote-controlled board located on the right-hand side of the printer. Issues with the Service Station can also be related to this control board.

Paper path and Cutter

Functionality

The paper path

This comprises all the elements of the printer in contact with the paper, designed to hold, move, and manage it in a controlled manner in order to print.

Paper can be loaded using a roll, which is mounted on the rear spindle, or single sheets loaded from the Multi-Sheet Tray, or single sheets loaded singly.

The paper passes from its source (Roll, Single Tray, or Multi-Sheet Tray) until it touches the Out-Of-Paper Sensor, when the printer detects the presence of the paper and proceeds to load it.

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To perform the paper feed, the printer catches the paper in between the Drive Roller and the Pinch Rollers (Pinch Rollers are spring-loaded pushing the paper down on top of the Drive Roller), then the paper is pushed forwards on top of the Print Platen in the print zone, which is where the printing operation is performed. The paper advance is provided by a motor that moves the Drive Roller. The exact position of the Drive Roller and hence the paper is controlled by an Encoder Disk located on the roller axis.

The printed paper then passes between the Output Shaft and the Starwheels (which keep the paper tension as flat as possible for printing) to exit on the Output Platen, where it is held in case of cut sheet or is cut to fall on the output basket in the case of roll paper.

The Output Shaft is designed to over-advance the Drive Roller movement slightly, and hence create the necessary paper tension to keep the paper as flat as possible. The Starwheels are spring-loaded and are designed to create force on top of the paper, this is done so as to leave the paper unmarked and at the same time allow the Output Shaft force to be appropriately transmitted.

In the Roll configuration, the rewinder module generates back force while printing to facilitate paper control.

A key electrical element of the paper path is the Paper Sensor (also known as the Out-Of-Paper Sensor or OOPS). This sensor is located at the beginning of the Print Platen; it detects paper insertion for roll load and single-sheet load.

Electronics

In the paper-path driving system, the only electrically active element is the Drive Roller. The Drive Roller is impelled by the drive roller motor and it contains an Encoder Disk on the axis to determine its position. The Encoder Disk is read by two sensors. One, the “encoder sensor”, designed to read the encoder, counts the Encoder Disk (the Encoder Disk outer marks) and another one, the “encoder index sensor”, determines the start position (the 0 position) of the Drive Roller by reading the inner thicker lines of the Encoder Disk.

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NOTE: Every time the printer starts up, it searches for the 0 position of the Drive Roller. If this search

fails (which means that the index sensor is faulty), the printer will give a system error and will be unable to initialize.

Subsystems

The roll paper input system

Functionality

This system keeps the roll in place and ensures controlled rotation.

It contains the rewinder, which rewinds the paper for paper ejection, and provides an opposite tension to the paper advance for better paper control.

The Left Support encloses the Rewinder Motor and Encoder, containing a set of gears that transmit

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the Rewinder motion to the spindle. There is a V-shaped spring to load and fix the spindle in position.

The Right Support holds the spindle in position to rotate over passive rollers.

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In the T520, the right support also contains the dampers for the roll cover opening movement control (the internal dampers perform a braking action preventing sudden movement during the opening operation).

NOTE: The right support for the T120 models does not contain dampers. The T120 and T520

have two different assemblies from the factory, nevertheless both can be replaced by the damper option of T520 (identical from the external point of view), and there is only one service part available.

The spindle is designed to hold the paper rolls, and receive the motion from the rewinder gear in

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the Left Support. It consists of a central bar and two hubs; the right hub is fixed to determine the right-side loading position of the paper, and the moveable left hub adjusts to the width of the paper.

The Roll Cover (T520 only) shields the roll from dust.

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NOTE: The Roll Cover is a passive part, with no sensor: the printer does not know its status.

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Electronics

The Rewinder Motor and Encoder system are directly controlled by the Main PCA.

The paper output system

Functionality

The system ensures that the printed paper follows a controlled path and acquires a certain shape in order to be delivered properly to the user. It also has a cosmetic function.

The system includes a set of three telescopic trays, which are extended to collect the cut-sheet paper printed from the Multi-Sheet Tray.

There are two roll-paper control tabs that are deployed automatically when the telescopic trays of the Output Tray are in the closed position. This is a purely mechanical action as the tabs are pushed up by the output trays when closed. The purpose of those tabs is to control the shape of the roll paper when coming out of the paper path.

The Front Cover is located underneath the Output Platen.

Electronics

The only electronic component related to the Output Platen is the Output Tray Sensor located underneath the output trays. The sensor is activated when the three output trays are fully closed. The sensor cable is routed via the front of the machine and is directly connected to the main PCA.

The Cutter system

The Cutter cuts the paper after the print has completed.

It comprises 1) a cutter module that cuts the paper with two rotary blades, 2) a Cutter Bridge attached to the Carriage that catches and releases the Cutter to perform the cutting operation and then to leave it in capping position, 3) a Cutter Guide that holds the movement of the Cutter along the printer width.

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Subsystems

In order to operate the Cutter, it needs to be in the parked position. If not, the Cutter will not be engaged by the Cutter Bridge and the printer will not perform the cutting action.

Whenever the printer initializes, it performs a parking movement with the Carriage to ensure that the Cutter is left in the appropriate position.

The printer does not have any feedback about the cutter engagement action. Hence, if for any reason the engagement is not performed correctly, the printer will continue operating as if the engagement has occurred.

How activation works

1. Pre-activation phase: The Cutter Engagement Feature of the Bridge gets into the funnel of the

Cutter Module grooving the Cutter to ensure the correct position for activation.

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2. Hook catching: The cutter bridge continues moving to the left pushing down the cutter hook (in

orange), after the left side of the cutter bridge passes the Carriage stops and the cutter hook returns to its position due to its spring motion.

3. Cutter action: The left feature of the cutter bridge pushes the cutter to the left, performing the

cutting operation.

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Subsystems

How deactivation works

1. Disengagement: Hook Bridge changes direction moving now from right to the left, so that Cutter

Hook slides out of the Cutter Catch Feature.

2. Move-away action: the Cutter Hook deactivates from the bridge by passing in front of it.

Accessory tray and right gear module

Functionality

The accessory tray holds and loads the cut-sheet paper for the printer. The accessory tray itself is a completely mechanical system with no electronics or motors. All the motion drives for both picking and paper drive are or created or transmitted by the Right Gear module located on the right-hand side of the printer, behind the Service Station.

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The Right Gear module has two main functions. It contains the motor encoder and gear drive system for the picking mechanism, and it contains the gear train system to transmit the movement from the drive roller to the accessory tray.

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Subsystems

Right Gear module functionality

The Right Gear module has two different functions associated with the Multi-Sheet Tray.

1. The paper drive from the Multi-Sheet Tray into the platen area (until the cut sheet reaches the drive

roller area).

The intermediate shaft in the Multi-Sheet Tray is driven by the drive roller through a gear train inside the Right Gear module. The intermediate shaft meshes with the Multi-Sheet Tray gear interface (red gear in the picture) at the end of the train. A swing arm engages the gear train when the Drive Roller is driven backwards (as shown in the picture), driving the intermediate shaft forwards. When the Drive Roller is driven forwards, the swing arm disengages from the gear train and the intermediate shaft is not driven. This action is to prevent reverse paper movement to be transmitted to the Multi-Sheet Tray.

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2. Picking functionality drive system

The Multi-Sheet Tray pick drive assembly is mounted in the right side gear module. The assembly contains a DC motor and pinion, belt, cluster pulley, and gear. An encoder (not shown, but it is located in front of the white gear shown in the picture) is read by the encoder sensor (in red in the picture) to servo-control the pick drive.

Right Gear and Multi-Sheet Tray interface

The two gears from the Right Gear module interface with the Multi-Sheet Tray by location once the Multi-Sheet Tray is locked in position; both gears can be considered fully engaged.

Multi-Sheet Tray functionality

The function of the Multi-Sheet Tray is to pick and feed the cut-sheet paper until the paper is grabbed by the drive roller (drive roller and pinch system).

The actions performed for those operations are (1) sheet pick and (2) sheet input.

1. Sheet pick

This movement is transmitted through a lateral gear chain in the Multi-Sheet Tray towards the swing arm, which is pushed towards the paper, and the picking mechanism located at the bottom of the MultiSheet Tray, which separates the top sheet from the stack of pages.

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Subsystems

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