HP laserjet 8000 schematic

HP LaserJet 8000, 8000 N, 8000 DN

English

and HP Mopier 240 Printers Service Manual Supplement for Paper-handling Accessories (C4781A, C4782A, C4785A)

HP LaserJet 8000, 8000 N, 8000 DN, and HP Mopier 240 Printers Service Manual Supplement for Paper-handling Accessories

HP 2000-sheet Input Tray (C4781A) HP Multibin Mailbox (C4785A) HP Duplex Unit (C4782A)

Publication number C4085-91023

First edition, March 1998

Warranty

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

Hewlett-Packard makes no warranty of any kind with respect to this information. HEWLETT-PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Hewlett-Packard shall not be liable for any direct, indirect, incidental, consequential, or other damage alleged in connection with the furnishing or use of this information.

WARNING

Electrical Shock Hazard To avoid electrical shock,

use only supplied power cords and connect only to properly grounded (3-hole) wall outlets.

Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714

Conventions

This publication uses the following conventions: The names of major printer parts and assemblies are Capitalized.

Color is used to emphasize important items.

Bold is used for emphasis. Italic refers to a related document, is used for emphasis, or is used for

supporting text.

Note

Caution

WARNING!

Notes contain important information.

Caution messages appear before procedures that, if not observed, could result in loss of data or damage to equipment.

Warning messages alert the reader to a specific procedure or practice that, if not followed correctly, could cause personal injury.

The illustration below shows the orientation of the paper-handling accessories as they are referred to in this publication.

Top

Back

Left

Right

Front

Back

Left

Right

Front

Bottom

iii

Contents

Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

New Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . x

1 Theory of Operation

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

2000-sheet Input Tray Theory of Operation . . . . . . . . . . . . . 1-2

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Pickup and Feed System . . . . . . . . . . . . . . . . . . . . . . 1-2

Lifter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Sensors, Switches, Clutches, and Motors . . . . . . . . . . . . . 1-5

Switches Functionality . . . . . . . . . . . . . . . . . . . . . . . 1-7

Multibin Mailbox Theory of Operation . . . . . . . . . . . . . . . 1-8

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Configuring the Operating Modes . . . . . . . . . . . . . . . . . 1-9

Sensors, Switches, Motors, and Controller PCA . . . . . . . . . 1-10

Receiving Paper . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Delivering Paper . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Power-on Sequence . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Communication Link (C-link) Cables . . . . . . . . . . . . . . . 1-15

Duplexer Theory of Operation . . . . . . . . . . . . . . . . . . . . 1-16

2 Removal and Replacement

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2000-sheet Input Tray Removal and Replacement . . . . . . . . . . 2-3

2000-sheet Input Tray Orientation . . . . . . . . . . . . . . . . . 2-3

2000-sheet Input Tray Front Cover . . . . . . . . . . . . . . . . 2-4

2000-sheet Input Tray Back Cover . . . . . . . . . . . . . . . . 2-5

2000-sheet Input Tray Left Cover . . . . . . . . . . . . . . . . . 2-6

2000-sheet Input Tray Right Cover . . . . . . . . . . . . . . . . 2-7

2000-sheet Input Tray Main Drive Assembly . . . . . . . . . . . 2-8

2000-sheet Input Tray Paper Tray . . . . . . . . . . . . . . . . . 2-9

2000-sheet Input Tray Main Cable Harness . . . . . . . . . . . . 2-10

2000-sheet Input Tray Controller PCA . . . . . . . . . . . . . . 2-11

2000-sheet Input Tray Front LED PCA Assembly . . . . . . . . 2-12

2000-sheet Input TrayPickup Assembly . . . . . . . . . . . . . 2-13

2000-sheet Input Tray Power Supply . . . . . . . . . . . . . . . 2-15

2000-sheet Input Tray Pickup, Feed, and Separation Rollers . . . 2-16

2000-sheet Input Tray Paper Quantity Switch Assembly . . . . 2-18

2000-sheet Input Tray Paper Size Switch Assembly . . . . . . 2-18

2000-sheet Input Tray VTU . . . . . . . . . . . . . . . . . . . 2-20

2000-sheet Input Tray Tension Springs . . . . . . . . . . . . . 2-21

2000-sheet Input Tray Locating Pins . . . . . . . . . . . . . . 2-22

2000-sheet Input Tray Outriggers (Stabilizing Feet) . . . . . . 2-23

2000-sheet Input Tray Casters . . . . . . . . . . . . . . . . . . 2-24

2000-sheet Input Tray Adjustable Foot . . . . . . . . . . . . . 2-25

Multibin Mailbox Removal and Replacement . . . . . . . . . . . 2-26

Multibin Mailbox Orientation . . . . . . . . . . . . . . . . . . 2-26

Multibin Mailbox Front and Back Covers . . . . . . . . . . . . 2-27

Multibin Mailbox Top Cover . . . . . . . . . . . . . . . . . . . 2-28

Multibin Mailbox Power Supply . . . . . . . . . . . . . . . . . 2-29

Multibin Mailbox Paper Bins and Blind Cover . . . . . . . . . 2-30

Multibin Mailbox Flipper Assembly . . . . . . . . . . . . . . . 2-31

Multibin Mailbox Delivery Head Motor . . . . . . . . . . . . . 2-34

Multibin Mailbox Transport Belt Motor . . . . . . . . . . . . . 2-35

Multibin Mailbox Input Paper Guide . . . . . . . . . . . . . . 2-36

Multibin Mailbox Metal Tape and Housing Assembly . . . . . 2-38

Multibin Mailbox Controller PCA . . . . . . . . . . . . . . . . 2-40

Multibin Mailbox Anticurl Strings . . . . . . . . . . . . . . . . 2-42

Multibin Mailbox Delivery Head Assembly . . . . . . . . . . . 2-44

Multibin Mailbox Interlock Switch . . . . . . . . . . . . . . . 2-47

Multibin Mailbox Diagnostic LED PCA . . . . . . . . . . . . 2-48

Multibin Mailbox User Status LED PCA . . . . . . . . . . . . 2-50

Multibin Mailbox Adjustable and Fixed Casters . . . . . . . . 2-52

Multibin Mailbox Attachment Assembly . . . . . . . . . . . . 2-53

3 Troubleshooting

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Troubleshooting Approach . . . . . . . . . . . . . . . . . . . . . . 3-2

Print the Event Log . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Display the Event Log . . . . . . . . . . . . . . . . . . . . . . . 3-2

Interpret the Event Log . . . . . . . . . . . . . . . . . . . . . . . 3-3

Print a Configuration Page . . . . . . . . . . . . . . . . . . . . . 3-3

C-link Communication Cables . . . . . . . . . . . . . . . . . . . 3-6

Paper Path Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Messages Structure . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

2000-sheet Input Tray Standalone Diagnostics . . . . . . . . . . . 3-10

2000-sheet Input Tray Motor Test . . . . . . . . . . . . . . . . 3-10

2000-sheet Input Tray Standalone Running Test . . . . . . . . 3-11

2000-sheet Input Tray Sensor Test . . . . . . . . . . . . . . . . 3-11

2000-sheet Input Tray LED Status Interpretation . . . . . . . . 3-12

Multibin Mailbox Standalone Diagnostics . . . . . . . . . . . . . 3-13

Multibin Mailbox LEDs Description . . . . . . . . . . . . . . 3-13

Multibin Mailbox Standalone Diagnostic Test . . . . . . . . . . 3-14

Power-on Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Multibin Mailbox Paper Path Test . . . . . . . . . . . . . . . . . 3-15

Multibin Mailbox LEDs Status Interpretation . . . . . . . . . . . 3-15

General Troubleshooting Information . . . . . . . . . . . . . . . . 3-19

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

4 Parts

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

2000-sheet Input Tray Components . . . . . . . . . . . . . . . . . 4-3

Multibin Mailbox Components . . . . . . . . . . . . . . . . . . . . 4-7

Duplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

List of Figures

Figure 1-1 2000-sheet Input Tray Paper Path . . . . . . . . . . 1-4

Figure 1-2 2000-sheet Input Tray Sensors, Switches, Clutches,

and Motors . . . . . . . . . . . . . . . . . . . . . . 1-6

Figure 1-3 Multibin Mailbox Sensors, Switches, Motors, and

Controller PCA . . . . . . . . . . . . . . . . . . . . 1-11

Figure 1-4 Multibin Mailbox Paper Path . . . . . . . . . . . . . 1-13

Figure 1-5 C-link Cables, Supported Daisy-chain Connections . 1-15

Figure 1-6 Duplexer Location . . . . . . . . . . . . . . . . . . 1-16

Figure 2-1 Phillips versus Posidriv Screwdrivers . . . . . . . . 2-2

Figure 2-2 2000-sheet Input Tray Orientation . . . . . . . . . . 2-3

Figure 2-3 2000-sheet Input Tray Front Cover . . . . . . . . . . 2-4

Figure 2-4 2000-sheet Input Tray Back Cover . . . . . . . . . . 2-5

Figure 2-5 2000-sheet Input Tray Left Cover . . . . . . . . . . 2-6

Figure 2-6 2000-sheet Input Tray Right Cover . . . . . . . . . 2-7

Figure 2-7 2000-sheet Input Tray Main Drive Assembly . . . . 2-8

Figure 2-8 2000-sheet Input Tray Paper Tray . . . . . . . . . . 2-9

Figure 2-9 2000-sheet Input Tray Main Cable Harness . . . . . 2-10

Figure 2-10 2000-sheet Input Tray Controller PCA . . . . . . . . 2-11

Figure 2-11 2000-sheet Input Tray Front LED PCA . . . . . . . 2-12

Figure 2-12 2000-sheet Input TrayPickup Assembly . . . . . . . 2-13

Figure 2-13 2000-sheet Input Tray Pickup Assembly

Photosensors . . . . . . . . . . . . . . . . . . . . . 2-14

Figure 2-14 2000-sheet Input Tray Power Supply . . . . . . . . . 2-15

Figure 2-15 2000-sheet Input Tray Rollers: Pickup, Feed, and

Separation . . . . . . . . . . . . . . . . . . . . . . . 2-17

Figure 2-16 2000-sheet Input Tray Paper Size and Paper

Quantity Switch Assemblies (1 of 2) . . . . . . . . . 2-19

Figure 2-17 2000-sheet Input Tray Paper Size and Paper

Quantity Switch Assemblies (2 of 2) . . . . . . . . . 2-19

Figure 2-18 2000-sheet Input Tray Vertical Transfer Unit (VTU) 2-20

Figure 2-19 2000-sheet Input Tray Tension Springs . . . . . . . 2-21

Figure 2-20 2000-sheet Input Tray Locating Pins . . . . . . . . . 2-22

Figure 2-21 2000-sheet Input Tray Outriggers . . . . . . . . . . 2-23

Figure 2-22 2000-sheet Input Tray Casters . . . . . . . . . . . . 2-24

Figure 2-23 2000-sheet Input TrayAdjustable Foot . . . . . . . . 2-25

Figure 2-24 Multibin Mailbox Orientation . . . . . . . . . . . . 2-26

Figure 2-25 Multibin Mailbox Covers (Front and Back) . . . . . 2-27

Figure 2-26 Multibin Mailbox Top Cover . . . . . . . . . . . . . 2-28

Figure 2-27 Multibin Mailbox Power Supply . . . . . . . . . . . 2-29

Figure 2-28 Multibin Mailbox Paper Bins and Blind Cover . . . 2-30

Figure 2-29 Multibin Mailbox Flipper Assembly (1 of 3) . . . . 2-32

Figure 2-30 Multibin Mailbox Flipper Assembly (2 of 3) . . . . 2-32

vii

Figure 2-31 Multibin Mailbox Flipper Assembly (3 of 3) . . . . 2-33

Figure 2-32 Multibin Mailbox Delivery Head Motor . . . . . . . 2-34

Figure 2-33 Multibin Mailbox Transport Belt Motor . . . . . . . 2-35

Figure 2-34 Multibin Mailbox Input Paper Guide (1 of 2) . . . . 2-36

Figure 2-35 Multibin Mailbox Input Paper Guide (2 of 2) . . . . 2-37

Figure 2-36 Multibin Mailbox Metal Tape and Housing

Assembly (1 of 2) . . . . . . . . . . . . . . . . . . 2-39

Figure 2-37 Multibin Mailbox Metal Tape and Housing

Assembly (2 of 2) . . . . . . . . . . . . . . . . . . 2-39

Figure 2-38 Multibin Mailbox Controller PCA (1 of 2) . . . . . 2-40

Figure 2-39 Multibin Mailbox Controller PCA (2 of 2) . . . . . 2-41

Figure 2-40 Multibin Mailbox Anticurl Strings (1 of 2) . . . . . 2-42

Figure 2-41 Multibin Mailbox Anticurl Strings (2 of 2) . . . . . 2-43

Figure 2-42 Multibin Mailbox Delivery Head Assembly

(1 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 2-45

Figure 2-43 Multibin Mailbox Delivery Head Assembly

(2 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 2-45

Figure 2-44 Multibin Mailbox Delivery Head Assembly

(3 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 2-46

Figure 2-45 Multibin Mailbox Delivery Head Assembly

(4 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 2-46

Figure 2-46 Multibin Mailbox Interlock Switch . . . . . . . . . 2-47

Figure 2-47 Multibin Mailbox Diagnostic LED PCA (1 of 2) . . 2-48 Figure 2-48 Multibin Mailbox Diagnostic LED PCA (2 of 2) . . 2-49 Figure 2-49 Multibin Mailbox User Status LED PCA (1 of 2) . . 2-50 Figure 2-50 Multibin Mailbox User Status LED PCA (2 of 2) . . 2-51 Figure 2-51 Multibin Mailbox Adjustable and Fixed Casters . . 2-52

Figure 2-52 Multibin Mailbox Attachment Assembly . . . . . . 2-53

Figure 3-1 Sample Configuration Page . . . . . . . . . . . . . 3-4

Figure 3-2 Sample Menu Page . . . . . . . . . . . . . . . . . . 3-5

Figure 3-3 C-link Cables, Supported Daisy-chain Connections . 3-6

Figure 3-4 Paper Path Test Source and Output Selection . . . . 3-8

Figure 3-5 Multibin Mailbox LEDs Description . . . . . . . . 3-13

Figure 3-6 Multibin Mailbox Power Supply Test Mode Switch 3-14

Figure 3-7 2000-sheet Input Tray Controller PCA Inputs . . . . 3-20

Figure 3-8 2000-sheet Input Tray Controller PCA Outputs . . . 3-21

Figure 3-9 2000-sheet Input Tray Main Wiring Diagram . . . . 3-22

Figure 3-10 Multibin Mailbox Main Wiring Diagram . . . . . . 3-23

Figure 4-1 2000-sheet Input Tray (C4781A) Components

(1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Figure 4-2 2000-sheet Input Tray (C4781A) Components

(2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Figure 4-3 Multibin Mailbox (C4785A) Components (1 of 3) . 4-6 Figure 4-4 Multibin Mailbox (C4785A) Components (2 of 3) . 4-8 Figure 4-5 Multibin Mailbox (C4785A) Components (3 of 3) . 4-10

viii

List of Tables

Table 1-1 2000-sheet Input Tray Sensors, Switches, Clutches,

and Motors . . . . . . . . . . . . . . . . . . . . . . . 1-5

Table 1-2 2000-sheet Input Tray Paper Quantity Switches . . . . 1-7

Table 1-3 2000-sheet Input Tray Paper Size Switches . . . . . . 1-7

Table 1-4 Multibin Mailbox Sensors, Switches, Motors, and

Controller PCA . . . . . . . . . . . . . . . . . . . . . 1-10

Table 3-1 DIP Switch Settings . . . . . . . . . . . . . . . . . . 3-10

Table 3-2 2000-sheet Input Tray LED Status Interpretation . . . 3-12

Table 3-3 Multibin Mailbox LED Status Interpretation . . . . . 3-15

Table 4-1 2000-sheet Input Tray (C4781A) Components

(1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Table 4-2 2000-sheet Input Tray (C4781A) Components

(2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Table 4-3 Multibin Mailbox (C4785A) Components (1 of 3) . . 4-7 Table 4-4 Multibin Mailbox (C4785A) Components (2 of 3) . . 4-9 Table 4-5 Multibin Mailbox (C4785A) Components (3 of 3) . . 4-11

Table 4-6 Duplexer . . . . . . . . . . . . . . . . . . . . . . . . 4-11

New Product Features

2000-sheet Input Tray

• variable speed

• standalone self-test diagnostics

• diagnostic LEDs

• user status LED

• new parts kits and field-replaceable units (FRUs)

Multibin Mailbox

• variable speed

• standalone self-test diagnostics

• diagnostic LEDs

• user status LED

• factory cable routing and preinstallation

• new parts kits and field-replaceable units (FRUs)

• new power supply

• adjustable casters

• new latching mechanism

Duplexer

• variable speed

• new FRU status

Theory of Operation

Overview

The following information provides the theory of operation for the following paper-handling accessories and parts:

• Paper-handling Controller

• HP 2000-sheet Input Tray

• HP Multibin Mailbox (MBM)

• Duplexer

The information in this manual supplements the information in the

HP LaserJet 8000, 8000 N, 8000 DN, and HP Mopier 240 Printers Service Manual (part no. C4085-91017). Use this supplement with the HP LaserJet 8000, 8000 N, 8000 DN, and HP Mopier 240 Printers Service Manual.

Theory of Operation 1-1

2000-sheet Input Tray Theory of Operation

Features

The HP 2000-sheet Input Tray now supports variable engine input speeds, ranging from 6 to 32 ppm. The 2000-sheet Input Tray also automatically senses paper size.

Pickup and Feed System

When the 2000-sheet Input Tray is loaded with paper and the paper tray is closed, the paper stack moves into position under the Pickup, Feed, and Separation Rollers. This operation is detected by the PS34 sensor in the 2000-sheet Input Tray’s Pickup Assembly. The presence of paper in the paper tray is detected by the PS33 sensor. The paper level is detected by switches SW601 and SW602 in the Paper Quantity Switch Assembly. The paper size is detected by switches SW701 through SW704 in the Paper Size Switch Assembly.

When the Paper-handling Controller on the printer sends an input command to the Controller PCA on the 2000-sheet Input Tray, the Paper Deck Driver runs the Pickup Motor to rotate the Pickup, Feed, and Separation Rollers. As the Pickup Roller turns, the paper feeds into the Vertical Transfer Unit (VTU) and passes through the PS31 and PS32 sensors.

If the paper fails to reach the PS31 and PS32 sensors in the VTU within the allotted time, the Controller PCA on the 2000-sheet Input Tray assumes that a paper jam has occurred. The 2000-sheet Input Tray stops the operation and reports the paper jam to the Paper-handling Controller on the printer. A paper jam message appears on the printer control panel display.

Hardware malfunctions are also displayed on the printer control panel.

1-2 Theory of Operation

Lifter Operation

The lifter plate in the 2000-sheet Input Tray’s paper tray is held by two wires that are wound on four pulleys by the Lifter Motor. When the paper tray is open, the pulley gears disengage from the motor gears, and the Lifter lowers by its own weight. The presence or absence of the tray is detected by switches SW701 through SW704 on the unit’s Paper/Tray Size Switch Assembly.

After the paper tray is closed, the Lifter Motor lifts the paper stack into position; this action is detected by the PS34 sensor. The PS34 sensor also maintains the height of the paper stack. As paper is picked up by the rollers, the number of sheets decreases. Once the paper stack decreases to a certain level, the PS34 sensor registers a low condition. Then the Paper Deck Driver turns on the Lifter Motor again and lifts the paper stack until the PS34 sensor registers sufficient paper in the tray.

Power Supply

The 2000-sheet Input Tray has an internal Power Supply that activates when the printer’s power switch is turned on. The Paper-handling Controller on the printer sends a power-on signal to the Power Supply on the 2000-sheet Input Tray through the Controller PCA on the 2000-sheet Input Tray. When the signal is high, the Power Supply provides both +24V and +5V to the Paper Deck Driver.The +24V drives the motors, clutches, and solenoids for the lifter, feed, and pickup systems. The +5V drives the sensors and PCA electronics.

Theory of Operation 1-3

Paper Path

Figure 1-1 illustrates the paper path components in the 2000-sheet Input Tray.

Figure 1-1 2000-sheet Input Tray Paper Path

1-4 Theory of Operation

Sensors, Switches, Clutches, and Motors

Table 1-1 and Figure 1-2, on the next page describe and illustrate the sensors, switches, clutches, and motors on the 2000-sheet Input Tray.

Table 1-1 2000-sheet Input Tray Sensors, Switches, Clutches, and Motors

Control Device Description Location

CL31 VerticalTransfer Unit (VTU)

Clutch CL32 Main Drive Clutch VTU MT31 Main Motor PaperDeck Drive Assembly PS31 Paper Entry Sensor VTU PS32 Paper Exit Sensor VTU PS33 Paper Tray Empty Sensor PaperPickup Assembly PS34 Paper Tray Raised Sensor PaperPickup Assembly PS35 VTU Closed Sensor PaperPickup Assembly SW601-SW602 Paper Quantity Switches Lower Chassis SW701-SW704 Paper SizeSwitches Lower Chassis PowerSupply Switch Normal/Diagnostic Mode

Switch

VerticalTransfer Unit (VTU)

PowerSupply

Theory of Operation 1-5

Figure 1-2 2000-sheet Input Tray Sensors, Switches, Clutches, and Motors

1-6 Theory of Operation

Switches Functionality

Tables 1-2 and 1-3 show the paper quantity and paper size switches on the 2000-sheet Input Tray.

Paper Quantity Switches

Table 1-2 2000-sheet Input Tray Paper QuantitySwitches

SW601 SW602 Remaining Paper

Off Off 100% On Off 75% On On 50% Off On 25%

Paper Size Switches

Table 1-3 2000-sheet Input Tray Paper Size Switches

Paper Size SW701 SW702 SW703 SW704

Ledger (portrait) Off On Off Off A3 (portrait) On On Off Off B4 (portrait) Off Off On Off Legal (portrait) Off On On Off Letter (landscape) Off On Off On A4 (landscape) On On Off On

Theory of Operation 1-7

Multibin Mailbox Theory of Operation

Features

The Multibin Mailbox (MBM) is an output unit designed for variable speeds, ranging from 6 to 32 ppm. The Multibin Mailbox holds up to 2,100 sheets distributed in eight 250-sheet standard output bins and one 100-sheet left output bin. The Multibin Mailbox also features four intelligent and configurable operating modes.

Operating Modes

Mailbox Mode

In Mailbox Mode, the network administrator can address each bin as an output destination with a name assigned to it. The printer sends a print job to the selected bin. If the assigned bin is full, the printer either stops printing or sends subsequent pages to the overflow bin, which is also defined by the network administrator.

Job Separator Mode

In Job Separator Mode, each print job is placed in a separate bin. All Multibin Mailbox bins are used for this purpose, starting with the first standard output bin (at the top). If a Multibin Mailbox bin is full, the printer automatically sends the job to the next available bin. If there are more jobs than bins, the extra jobs will start again at the top standard output bin.

This process is seen by the printer software as one logical bin.

Virtual Stacker Mode

In Virtual Stacker Mode, printed sheets are stacked face down in the bins from the lowest bin to the top bin, regardless of where a print job begins or ends. All printed sheets are sent to the bottom bin until it is full; subsequent sheets are sent to the next upward bin until it is full. This mode of operation takes advantage of the total capacity of the Multibin Mailbox bins.

In this mode, the software sees the Multibin Mailbox as one logical bin. When the Multibin Mailbox is full, the printer stops sending paper until all the bins are emptied.

1-8 Theory of Operation

Collator Mode

Each mopy (copy) of a single job is sent to a different bin (next bin down). This mode separates mopies automatically.

In Collator Mode, the device automatically separates mopies. Each mopy is delivered in consecutive bins, starting with the top standard output bin. In this case, one job contains several mopies.

Configuring the Operating Modes

The network administrator chooses the mode of operation through an HP network configuration utility, such as the HP JetAdmin utility or the HP LaserJet utility for the Macintosh. Additionally,on all workstations that print to the printer, the printer driver might need to be set up to reflect the chosen operating mode.

Bidirectional environment: The printer automatically selects the mode established by the network administrator.

Unidirectional environment: The mode of operation can be changed in the driver. The method for changing the mode varies with the driver and type of operating system. For additional information, see the online help for the printer software.

Theory of Operation 1-9

Sensors, Switches, Motors, and Controller PCA

Table 1-4 and Figure 1-3 on the next page illustrate and describe the Multibin Mailbox sensors, switches, motors, and Controller PCA.

Table 1-4 Multibin Mailbox Sensors, Switches, Motors,and Controller PCA

Control Device Description Location

M1 Delivery Head Motor Upper-back Side M2 Flipper Roller Motor with

M3 Delivery Head Roller Motor Delivery Head Assembly

M4 Ejector Motor Under Delivery Head Assembly M5 Transport Belt Motor Lower-back Side PSBinEmpty PaperBin Empty Sensor Delivery HeadAssembly

PSBinFull/Head Position

PSEject Delivery Rollers Extended

PSEntry Paper Entry Sensor Flipper Assembly (top, center) PSExit1 Paper Deliveredto Head

PSExit2 Paper Deliveredto Bin Sensor Delivery Head Assembly

PSFaceUp Reverse Stepper Motor Sensor Flipper Assembly (top, center) PSFaceFull Left Output Bin Full Sensor Flipper Assembly (top, center) SW1 Interlock Switch Middle-back Side IR LED Infrared Light-emitting Diode

Encoder

PaperBin (below)Full Sensor Delivery Head Assembly

Sensor

(forStapler Assembly)

Flipper Assembly (upper back)

(upper back)

(upper back) Delivery Head Assembly

(upper back)

Delivery Head Assembly (upper back)

(upper back)

Delivery Head Assembly (left, center)

1-10 Theory of Operation

Figure 1-3 Multibin Mailbox Sensors, Switches, Motors, and Controller PCA

Theory of Operation 1-11

Receiving Paper

The printer delivers paper to the Multibin Mailbox through the left output delivery slot (Input Paper Guide) at a rate of 107 mm per second. Paper arrival is sensed by the PSEntry sensor, which activates the Flipper Roller Motor (M2), causing the paper to move through the Multibin Mailbox transport and delivery system. See Figure 1-4.

Delivering Paper

The Delivery Head Assembly on the Multibin Mailbox moves or stays in the indicated bin according to the commands coming from the Paper-handling Controller on the printer. If paper is designated for the left output bin, the Multibin Mailbox feeds it through the Flipper Assembly. If paper is designated for one of the standard output bins, the Multibin Mailbox feeds it through the Flipper Assembly until the trailing edge is sensed by the PSFaceUp sensor. Then the Flipper Roller Motor (M2) reverses and feeds the paper down between the Transport Belt and the Metal Tape until it reaches the Delivery Head Assembly.

1-12 Theory of Operation

Paper Path

Figure 1-4 illustrates the components of the Multibin Mailbox paper path.

Figure 1-4 Multibin Mailbox Paper Path

Theory of Operation 1-13

Power-on Sequence

During the power-on sequence, the Delivery Head Assembly moves first to the top “home” position at the left output bin. From that position the delivery head moves down, scanning to determine if all the Multibin Mailbox bins are installed, if they contain paper, and if they are full. Then the Delivery Head proceeds upward again to the home position and remains there for about 7 seconds. Finally, the Delivery Head Assembly moves to the bottom bin, where it waits for the next command from the Paper-handling Controller.

Note

If one of the bins has been removed or is not seated correctly, the Delivery Head Assembly will not complete the scan and will send an error message to the printer control panel.

1-14 Theory of Operation

Communication Link (C-link) Cables

Communication with the Multibin Mailbox is handled through the Paper-handling Controller on the printer. The information coming from the Paper-handling Controller is carried by the C-link cables that connect the Paper-handling Controller PCA to all the devices that support the C-link protocol.

Figure 1-5 C-link Cables, Supported Daisy-chain Connections

Theory of Operation 1-15

Duplexer Theory of Operation

The Duplexer installs inside the printer, below the Fusing Assembly. The back side of the paper is printed first. Then the paper is turned over and fed back through the paper path for front-sided printing. The new Duplexer supports variable engine input speeds.

The Envelope Feeder installs on the right side of the printer above Tray 1.

Figure 1-6 Duplexer Location

1-16 Theory of Operation

Removal and Replacement

OverviewOverview

This chapter provides removal and replacement information for the following HP paper-handling accessories:

• HP 2000-sheet Input Tray

• Multibin Mailbox (MBM)

The removal and replacement information presented in this chapter supplements the information in the HP LaserJet 8000, 8000 N, 8000 DN, and HP Mopier 240 Printers Service Manual. Use this supplement with the HP LaserJet 8000, 8000 N, 8000 DN, and HP Mopier 240 Printers Service Manual.

WARNING!

Caution

Electrical Shock Hazard

To avoid electrical shock, use only supplied power cords and connect only to properly grounded (3-hole) wall outlets.

The printer and accessories contain parts that are sensitive to electrostatic discharge (ESD). Always service printers at an ESD-protected workstation. Watch for the ESD reminder symbol on illustrations.

Removal and Replacement 2-1

Figure 2-1

Required Tools

• #2 Phillips screwdriver (6-inch [152 mm] shaft)

• Small flat-blade screwdriver

• Small needle-nose pliers

• T-10, T-15, and T-20 Torx driver (6-inch shaft) for the Multibin Mailbox

All components in the 2000-sheet Input Tray use Phillips-head screws that require a #2 Phillips screwdriver. Make sure that you have a Phillips screwdriver and not a Posidriv screwdriver. Figure 2-1 shows the difference between a Phillips and a Posidriv screwdriver. Note that the Phillips tip has more beveled surfaces.

Phillips versus Posidriv Screwdrivers

Caution

2-2 Removal and Replacement

To install a self-tapping screw, first turn it counterclockwise to align it with the existing thread pattern. Then carefully turn it clockwise to tighten it. Do not over-tighten it. If a self-tapping screw hole becomes stripped, either repair the screw hole or replace the affected assembly.

2000-sheet Input Tray Removal and Replacement

WARNING!

Note Reinstallation is generally the reverse of the removal process. Carefully

For the procedures in this section, the printer and all accessories must be unplugged. Before attempting to service the 2000-sheet Input Tray, unplug the power cord from the power source; otherwise, severe injury may result.

The printer and accessories may have sharp edges that could cause injury.

follow any additional instructions provided under “To Reinstall.”

2000-sheet Input Tray Orientation

Figure 2-2 shows the orientation of the 2000-sheet Input Tray as it is referred to in this section.

Top

Back

Left

Figure 2-2 2000-sheet Input Tray Orientation

Right

Front

Bottom

Removal and Replacement 2-3

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