HP LaserJet 8000 Paperhandling addon Service Manual.pdf

English

HP LaserJet 8000, 8000 N, 8000 DN

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)

Hewlett-Packard

Company 1998

Warranty

The information

contained in this

document is subject to

change without notice.

WARNING

Electrical Shock Hazard

Reproduction, adaptation,

or translation without

prior written permission

is prohibited, except as

allowed under the

To avoid electrical shock,

use only supplied power

cords and connect only to

properly grounded

(3-hole) wall outlets.

Hewlett-Packard makes

no warranty of any kind

with respect to this

information.

HEWLETT-PACKARD

SPECIFICALLY

DISCLAIMS THE

IMPLIED WARRANTY

MERCHANTABILITY

AND FITNESS FOR A

PARTICULAR

PURPOSE.

Publication number

C4085-91023

First edition, March 1998

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.

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

Notes contain important information.

Caution

Caution messages appear before procedures that, if not observed, could

result in loss of data or damage to equipment.

WARNING! 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.

To p

Back

Right

Back

Right

Left

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 Tray Pickup Assembly . . . . . . . . . . . . . 2-13

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

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

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