Text preview for : HP DeskJet 70-75-755 Service Manual.pdf part of HP DesignJet 700 HP DesignJet 700, HP DesignJet 750C, HP DesignJet 750C Plus and HP DesignJet 755CM Plotters/Printers Service Manual



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Service Manual

HP DesignJet 700, HP DesignJet 750C, HP DesignJet 750C Plus and HP DesignJet 755CM Plotters/Printers

For HP Internal Use Only E Copyright HewlettPackard Company 1996 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 into another language without the prior written consent of HewlettPackard Company. HP internal order number C4705-90000 Second edition, August 1996 Printed in U.S.A.

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: D Ensure that the ac power outlet (mains) has a protective earth (ground) terminal. D Disconnect the plotter from the power source prior to performing any maintenance. D Prevent water or other liquids from running onto electrical components or circuits, or through openings in the enclosure. Electrostatic Discharge Refer to the beginning of Chapter 6 of this manual, for precautions you should take to prevent damage to the plotter circuits from electrostatic discharge. Safety Symbols General definitions of safety symbols are given immediately after the table of contents.

Learning Products, Barcelona Division Hewlett-Packard Espaola, S.A. Avda. Graells, 501 08190 Sant Cugat del Valls Spain

Service Manual

HP DesignJet 700 HP DesignJet 750C HP DesignJet 750C Plus and HP DesignJet 755CM Plotters/Printers

Using this Manual
Purpose
This manual contains information necessary to test, calibrate and service: D D D D HP DesignJet 700 plotters (models C4705A and C4706A) HP DesignJet 750C plotters (models C3195A and C3196A) HP DesignJet 750C Plus plotters (models C4708A and C4709A) HP DesignJet 755CM printers (models C3198A and C3198B)

For information about using these plotters/printers, refer to the corresponding user and quick reference guides.

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

Training
The HP ongoing training course CEV2 TIJ provides training for HP Customer Engineers and Authorized Dealers, on servicing the complete HP DesignJet series of large format, thermal inkjet plotters.

Part Numbers
Part numbers for plotter options, accessories and service parts are located in chapter 10.

Conventions
This manual contains information for the monochrome HP DesignJet 700 plotters, the color HP DesignJet 750C and 750C Plus plotters and the color HP DesignJet 755CM printers. To highlight the differences between the various plotters/printers the following symbols will be used in the left margin: This symbol indicates the information specific only to a particular plotter/printer. The symbol will contain the name(s) of the plotter(s) that it is referring to.
750C Plus

Example: This text is applicable only to the HP DesignJet 750C Plus. All other information not marked by these symbols is applicable to all plotters. The term D/A1 size plotters refers generically to models C4705A, C3195A and C4708A The term E/A0 size plotters refers generically to models C4706A, C3196A, C4709A, C3198A and C3198B. A small arrow ' is used to indicate other parts of the Service Manual or User's Guide where you can find information related to the topic you are consulting. ii Using this Manual

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Contents

Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x 1 Product Information 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 3 3 3 3 4 4 5 5 6 6

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Graphics Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Device Control Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Network Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Media Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Media Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Media Margins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Other Plotter Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Upgrading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Site Planning and Requirements

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Choosing an Interface Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Choosing a Suitable Plotter Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3

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3

Installation and Configuration 3 3 3 3 3 3 3 3 3 3 3 3 3 3 2 5 5 6 10 10 10 11 11 12 12 12 12 13

Unpacking and Assembling the Plotter/Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . Inspecting the Plotter/Printer for Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repacking the Plotter/Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembling the Legs and Media Bin (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . Installing the Plotter/Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Plotter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DesignJet 750C/750C Plus/755CM Front Panel . . . . . . . . . . . . . . . . . . . . . . . . DesignJet 700 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Third Party Inks and Off Axis Ink Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuring the Plotter/Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Verifying Plotter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power On Self Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Demonstration Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Example of the Current Configuration Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Preventive Maintenance

Moisture on the Plotter/Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Noisy Carriage Bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Belt Swelling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning the Plotter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning the Drive Roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level of Plotter Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Usage Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 4 4 4 4 4 4 4 4 4

2 2 2 2 2 3 4 4 4 4

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Functional Overview 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 2 2 2 2 4 4 4 5 5 5 5 6 6 6 6 6 6 6 7 7 7 7 7 8 9 9 9 9 9 10 10 10

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Simplified Description of Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Plotting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Servo Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stepper Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carriage Axis Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Line Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Media Axis Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primer Stepper Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bail Stepper Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wiper Stepper Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Window Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pinch Wheel Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Media Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drop Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Primer Cam Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Printed Circuit Assembly (PCA) Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carriage PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Line Sensor PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Sensor IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Linear Encoder IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Print Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PWM Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Panel PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drop Sensor PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Supply PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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6 Removal and Replacement Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrostatic Discharge (ESD) Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Electronics Enclosure Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing a Memory Module (DRAM/ROM SIMM) . . . . . . . . . . . . . . . . . . . . . Reinstalling a Memory Module (DRAM/ROM SIMM): . . . . . . . . . . . . . . . . . . Removing the Main PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Power Supply PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Center Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Left Endcover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Right Endcover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Front Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Window Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Pinch Wheel Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Media Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Carriage (Y Axis) Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Media (X Axis) Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Encoder Strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reinstalling the Encoder Strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Y Tensioner Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Y Axis Motor Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Cutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Cartridge Carriage and Drive Belt . . . . . . . . . . . . . . . . . . . . . . . Removing the Trailing Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reinstalling the Trailing Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Starguard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Primer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Service Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Spittoon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Bail Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Bail Stepper Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Cable Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Overdrive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Drive Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Rollfeed Cover Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Rollfeed Module Assemblies (Left and Right) . . . . . . . . . . . . . Removing the Entry Platen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Cutter Enclosure Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Media Diverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Pinch Arm Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6

2 3 3 3 4 5 5 7 8 9 11 12 13 14 16 17 18 20 21 22 24 25 27 29 31 32 33 34 36 39 40 41 42 44 45 46 47 48 49 51 52 53 55 56 57

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Calibrations and Adjustments 7 7 7 7 7 7 7 2 2 3 3 4 5 6

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Menu Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Entering the Service Tests Menu System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drop Detect Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Line Sensor Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accuracy Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Troubleshooting

Diagnostics Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Initialization Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Switch ON Normal Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power ON Self Test & Mechanical Initialization . . . . . . . . . . . . . . . . . . . . . . . Service Tests and Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Panel Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Worded Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Important Information on Troubleshooting Error Codes . . . . . . . . . . . . . . . . . . . Service Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Entering the Service Tests Menu System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. EEROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. EEROM Clear Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. EEROM Model Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. EEROM Model Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. MIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. Main PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. Main Carriage Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. Carriage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. Thermal Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9. TTOE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10. Pen Continuity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11. Pen ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12. Nozzle Print Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13. Mono PQ Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14. Color PQ Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15. Area fill PQ Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16. Pen Nozzle Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17. Drop Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18. Edge Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19. Pen Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20. Ortho Wiper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

2 2 2 2 3 4 5 5 9 9 17 20 21 22 23 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 39 40 41

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Contents vii

21. Primer Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22. X Motion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23. Mark Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24. Y Axis Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25. Y Static Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26. Y Axis Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27. Cutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28. Bail Stepper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29. Media Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30. Window Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31. Pinchwheel Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32. Button Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PC Based Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Configuration Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EEROM Text Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EEROM Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Print Quality

8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

Print Quality Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Print Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Print Mode Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How do I select the print mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Print Quality Diagnostic Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CAD 2 D Monochrome Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CAD Color Diagnostic Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Area Fill Diagnostic Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Print Quality Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cockle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Coalescence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Feathering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Migration (Black) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Halo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Banding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9

2 5 5 12 13 13 15 17 18 18 18 19 19 19 20 20

viii

Contents

C4699 90000

10 Product History and Service Notes Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Serial Number Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Identifying a Printed Circuit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Part Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Revision Letter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Firmware Revision Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Plotter Support Information on the World Wide Web . . . . . . . . . . . . . . . . . . . . . . Service Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Firmware History for HP DesignJets 750C and 755CM (Model A) . . . . . . . Problems with the Entry Platen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Problems that Cause Paper Advance Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . The Aerosol Phenomena Causing a Servo Shutdown Error . . . . . . . . . . . . . . Longer Screws Make Legs More Stable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Install a Line on the Mark Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Problems with Pen Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Flow from the Fan can Cause Spray and Misdirection . . . . . . . . . . . . . . . 11 Parts and Diagrams Legs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Window and Back Cover Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronics Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronics Enclosure (Continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carriage Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carriage Axis (Continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Left End Cover and Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Right End Cover and Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Roll Feed Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Station and Primer Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carriage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Media Entry Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Media Entry Path (Continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bail and Overdrive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pinch Arm Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stardguard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interface Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Support Services Hewlett Packard support services in the United States . . . . . . . . . . . . . . . . . . . . 11 2 Hewlett Packard support services in Europe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 Hewlett Packard support services in Asia Pacific . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 37 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 2 2 3 3 3 3 4 5 5 10 12 14 16 18 20 22

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Contents ix

General Definition of Safety Symbols
International caution symbol (refer to manual): the product is marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument. Indicates dangerous voltage (terminals fed from the interior by voltage exceeding 1000 volts must also be marked).
OR

Protective conductor terminal. For protection against electrical shock in case of a fault. Used with field wiring terminals to indicate the terminal that must be connected to ground before operating equipment. Low-noise or noiseless, clean ground (earth) terminal. Used for a signal common, as well as providing protection against electrical shock in case of a fault. A terminal marked with this symbol must be connected to ground in the manner described in the installation (operating) manual, and before operating the equipment.

OR

Frame or chassis terminal. A connection to the frame (chassis) of the equipment, which normally includes all exposed metal. Alternating current Direct current Alternating or direct current

WARNING

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury.

Take care not to cut yourself on the encoder strip inside the plotter. The CAUTION sign denotes a hazard. It 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 product.

CAUTION

x

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C4699 90000

1

Product Information

1-1

Description
Applications
The HP DesignJet 700 (monochrome), HP DesignJet 750C and 750C Plus (color) and HP DesignJet 750CM are large format, ink jet plotters/printers that print output from software applications, on paper and other media. The plotters/printers produce large format plots of high resolution and quality for the following sectors: D D D D D Computer aided design (CAD) Computer aided manufacturing (CAM) Mapping Mechanical and architectural drawing General drafting

Drivers
Software drivers for the following applications are supplied with the plotters: D AutoCAD for DOS D AutoCAD for Windows D MicroSoft Windows Applications (Other application software ' User's Guide, chapter 1.)

Graphics Languages
The plotters accept drawing data in the following graphics languages: D Hewlett Packard Graphics Language (HP GL), a vector language. D HP GL/2, an enhanced version of HP GL. D Hewlett Packard Raster Transfer Language (HP RTL), a raster language. The plotters support HP GL/2 with both the roman and the Japanese Kanji character sets (provided the Kanji ROM SIMM is fitted). PostScript is also available when the Postscript upgrade is fitted.

Device Control Languages
The plotters support the following languages, enabling the user to read certain plotter settings from the computer: D Printer Job Language (PJL) D Printer Management Language (PML)

1-2

Product Information

C4705-90000

Interface
The plotter has both RS 232 C and Centronics/Bi Tronics interfaces.

Network Connections
The following network operating systems are supported through an optional MIO external network interface: D D D D D D D Novell Netware (Ethernet) LAN Manager Token Ring network Apple LocalTalk HP external controller TCP/ICP host work station Ethertalk

Memory
700

DesignJet 700 plotters have 5.5 MB of standard on board RAM. A PostScript SIMM and an MIO card are optional. There are also two RAM expansion sockets, which can hold an optional 4MB, 8 MB, 16 MB or 32 MB single in line memory module (SIMM). The maximum RAM is therefore 69.5 MB. DesignJet 750C Plus plotters have 8 MB of standard on board RAM, plus an additional 3 MB used internally. A PostScript SIMM and an MIO card are optional. There are also two RAM expansion sockets, which can hold an optional 4 MB, 8 MB, 16 MB or 32 MB single in line memory module (SIMM). The maximum RAM is therefore 72 + 3 MB. DesignJet 750C plotters have 4 MB of standard on board RAM, plus an additional 3 MB used internally. A PostScript SIMM and an MIO card are optional. There are also two RAM expansion sockets, which can hold an optional 4MB, 8 MB, 16 MB or 32 MB single in line memory module (SIMM). The maximum RAM is therefore 68 + 3 MB. DesignJet 755CM printers (Model C3198A) have 4 MB of standard on board RAM, plus an additional 3 MB used internally. In addition, the Postscript SIMM, the MIO card and two 32 MB SIMMs are pre installed in the standard configuration. Therefore the total amount of useable RAM is 68 MB. DesignJet 755CM printers (Model C3198B) have 8 MB of standard on board RAM, plus an additional 3 MB used internally. In addition, the Postscript SIMM, the MIO card and two 32 MB SIMMs are pre installed in the standard configuration. Therefore the total amount of useable RAM is 72 MB.

750C Plus

750C

755 CM

Accuracy
The accuracy of the plotters in drawing a vector is"0.38 mm (0.015 in) or "0.2% of the specified vector length, whichever is greater, at 23 _C (73 _F) at 50 60% relative humidity, on HP special polyester film.

C4705-90000

Product Information

1-3

Resolution
The resolution of the plotter output is measured in dots per inch (dpi). The plotter resolutions for different plot quality settings are as follows:
750C Note: This table 755 CM Plot/Print Quality

is for DesignJets 750C and 755CM (model C3198A).
Monochrome 300 x 300 dpi 600 x 600 dpi 600 x 600 dpi Color 300 x 300 dpi, dot depleted 300 x 300 dpi 300 x 300 dpi (But 600 x 600 dpi for black with HP RTL)

Fast Normal Best

750C Note: This table Plus 755 CM Plot/Print Quality

is for DesignJets 750C Plus and 755CM (model C3198B).
Monochrome 300 x 300 dpi 600 x 600 dpi 600 x 600 dpi Color 300 x 300 dpi, dot depleted 300 x 300 dpi 600 x 600 dpi addressable

Fast Normal Best

700

Plot/Print Quality Fast Normal Best

Monochrome 300 x 300 dpi 600 x 600 dpi 600 x 600 dpi

Media Types (See also ' HP Media Reference Guide)
Monochrome Plotting Plain paper and plotter paper Plain vellum (HP preferred) Plain translucent paper (HP preferred) HP single-matte polyester film Color Plotting HP special inkjet paper

For additional media types available ' User's Guide, chapter 3, w Choosing media.

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Product Information

C4705-90000

Media Sizes
The plotters handle sheet media and roll media. Supported standard sizes are as follows:
D/A1-size plotters ANSI ISO Metric Oversize Architectural JIS A, B, C, D A4, A3, A2, A1 A2, A1 C, D A4, A3, A2, A1 B4, B3, B2 E/A0-size plotters A, B, C, D, E A4, A3, A2, A1, A0 A2, A1, A0 C, D, E, E1 A4, A3, A2, A1, A0 B4, B3, B2, B1, B0

210 1625 mm 8.3 64 in

210 1625 mm 8.3 64 in

Sheet media must not exceed the maximum and minimum dimensions shown here:

D/A1-size plotters

E/A0-size plotters

210 625 mm 8.3 24.6 in

210 917 mm 8.3 36.1 in

17 mm

The media margins define the real available plotting area on the media:
5 mm 17 mm = 0.67 in 5 mm = 0.2 in All measurements +/ 2mm (0.08 in)

5 mm portrait 5 mm

17 mm

Media Margins

landscape

5 mm

C4705-90000

17 mm

Product Information

17 mm

1-5

Other Plotter Features
D D D D D D Automatic media edge sensing. Automatic cartridge alignment, testing and servicing. Built in diagnostics and demonstration plots. Automatic media stacking with adjustable media bin. An automatic single axis cutter. Queuing, nesting and expanded margin capabilities (not applicable to plotters/printers with the PostScript SIMM installed). D Easy to read 2x30 vacuum fluorescent display (VFD).

Upgrading
An upgrade package, which can be installed by the user and which consists of an extra ROM and Postscript SIMMs is available. The differences between this plotter/printer and previous ones are:
750C Plus

D Addressable 600 dpi color print for excellent print quality. D Real 600 dpi monochrome print for excellent CAD print quality. D Quality color printing on plain CAD Bond paper. D Up to 9 months of indoor lightfastness with new color inks. D Optional color matching via Pantone licensed, color palettes and optional color management kit. D ColorSmart color rendering technology support for Windows users. D D D D D D D D D D D Darker pigment based black ink for sharper quality mono lines and text. Better image quality via advanced imaging print modes. Support for additional media including clear film, and several types of glossy paper. Windows 95 support. Much faster Windows driver that uses half as much memory and has an always available" print mode. Faster AutoCAD driver. Broad support of Asian drivers (Japanese, Korean, Chinese and Taiwanese for AutoCAD and Korean and Japanese for Windows). Faster I/O via a 5 times improvement in Bitronics I/O interface speed. Support for HP Jet Direct MIO 6.0 and Jet Direct EX and fast parallel port ECP . New industrial design. US EPA Energy Star rating (45 watt limit).

750C 750C Plus 755 CM

1-6

Product Information

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2

Site Planning and Requirements

2-1

Power Requirements
HP DesignJet 700, 750C, 750C Plus and 755 CM plotters/printers have self adjusting power supplies and do not require a voltage selector or switch settings prior to use. The table below lists the power requirements for the plotters. Power Requirements
Source Voltage Requirements: Voltage 100 V ac 120 V ac 220 V ac 240 V ac Normal Operating Range: Frequency: Consumption: 90 to 264 V ac 47-63 Hz 140 watts maximum Max current (rms) 1.40 A 1.17 A 0.64 A 0.60 A

WARNING

The ac power outlet (mains) must have a protective earth (ground) terminal. Serious shock hazard leading to death or injury may result if the plotter is not properly grounded.

Choosing an Interface Cable
(Instructions ' User's Guide, chapter 1, w Connect the plotter to your computer.)
Serial (RS 232 C) Interface A short cable (less than 15 meters or 50 feet) is recommended

for the RS 232 C interface. A longer cable is permissible, provided the load capacitance does not exceed 2500 picofarads.

Parallel (Bi Tronics/Centronics) Interface Use a short cable (less than 2 meters or 6.6 feet)

for the parallel interface.

(Cable part numbers ' Service Manual, chapter 11.)

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Site Planning and Requirements

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Choosing a Suitable Plotter Environment
The table below lists the environmental specifications for the plotters. Environmental Specifications
Temperature Storage Operating Optimal Operating Relative Humidity (Operating) Operating environment: Plotter/Printer With cartridges and media: Optimal print quality and media handling: Storage environment: Plotter/media Cartridges Temperature 0 to 55_C (32 to 131_F) 15 to 35_C (59 to 95_F) 15 to 30_C (59 to 86_F) Temperature 40 to +70_C (40 to +158_F) 40 to +60_C (40 to +140_F) Sound Pressure 54 dB (A) < 20 dB (A) 40 to +70 _C (40 to +158 _F) 0 to +55 _C (+32 to +131 _F) +15 to +30 _C (+59 to +86 _F) 20 to 80 % RH Relative Humidity 5-95% 20-80% 20-80% Relative Humidity 20-80% 20-90% Sound Power 6.5 bels (A) < 3.6 bels (A)

Acoustics:* Operating Idle

*These specifications are typical sound pressures at a one meter bystander position. Idle specification
assumes fan is off.

Plotter Dimensions and Weight
Plotter Model: Height (window closed) Depth Length Weight E/A0-size plotters 1200 mm (47.3 in) 675 mm (26.6 in) 1370 mm (54 in) 42 kg (93 lbs) D/A1-size plotters 1200 mm (47.3 in) 675 mm (26.6 in) 1072 mm (42.2 in) 32 kg (71 lbs)

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Notes

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3

Installation and Configuration

3-1

Unpacking and Assembling the Plotter/Printer
When the plotter/printer arrives at the user site: 1 Inspect the shipping container for damage. If the shipping container shows signs of damage, retain it until you have checked the contents of the shipment and verified the performance of the plotter. 2 Unpack and assemble the plotter, following the series of illustrations as follows. The capitals included in the frames correspond to the following plotters: D: DesignJet 700, 750C and 750C Plus (D/A1) E: DesignJet 700, 750C and 750C Plus (E/A0) CM: 755CM (E/A0)

3-2

Installation and Configuration

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Inspecting the Plotter/Printer for Damage
Visually inspect the plotter/printer for damage, scratches, dents, or other mechanical defects. If the plotter is damaged in transit, notify the carrier and the nearest HP Sales and Support Office. Retain the shipping container and insulation material for the carrier's inspection. The Sales and Support Office will arrange for the repair or replacement of the plotter.

Repacking the Plotter/Printer
You can order a repacking kit if you need to repack the plotter/printer and don't have the shipping container and insulation material. (Part numbers ' chapter 11.) Be careful when returning the plotter/printer to ensure that at no time is it turned upside down - neither during packing nor shipment - otherwise ink from the spittoon may leak and damage the equipment.

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Assembling the Legs and Media Bin (Optional)
If the user has purchased the optional legs and media bin for the plotter, assemble them following the series of illustrations below:

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Installation and Configuration

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3-8

Installation and Configuration

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3-9

Installing the Plotter/Printer
(Instructions ' User's Guide, chapter 1, Setting up your plotter)

Using the Plotter
(Instructions ' User's Guide)
750C 750C Plus 755 CM

DesignJet 750C/750C Plus/755CM Front Panel

Display section

Status lights

Action keys

Plotting mode keys

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Installation and Configuration

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700

DesignJet 700 Front Panel

Display section

Status lights

Action keys

Plotting mode keys

Third Party Inks and Off Axis Ink Systems
HP does not support third party inks or off axis ink systems for use with any of its DesignJet series plotters or printers. If a failure or damage to such HP products is found to be directly attributed to the use of third party inks or off axis ink systems (or any other non supported HP supply or accessory), the repair will NOT be covered under HP's warranty or maintenance contract. In such cases, standard time and material charges will be applied to service the plotter or printer.

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3-11

Configuring the Plotter/Printer
(Instructions ' User's Guide, chapter 7) The User's Guide describes how to: D D D D D Print out a current configuration sheet (an example is given on the following page). Change the front panel settings. Change the graphics language settings. Change the interface settings. Upgrade the plotter with more memory (not applicable to the DesignJet 755CM).

Verifying Plotter Operation
The plotters contain several types of internal operational checks and tests to ensure that the plotter is properly functioning and to help identify problems if any are detected.

Power On Self Tests
Whenever you switch the plotter on, it automatically performs a series of internal self tests and mechanical initialization sequences. If a failure occurs, an error is indicated on the front panel display. You can perform a failure analysis by reading the error codes/messages. (Details ' chapter 8.)

Demonstration Plot
You can check proper plotter operation by plotting and examining the demonstration plot, which is resident in the plotters. This plot shows different plotter capabilities including pen line widths and shading. You can set the demonstration plot, to plot in any of the languages listed in the Language box on the front panel display. (Instructions ' User's Guide, chapter 1, w Change the language, ' User's Guide, chapter 1, w Send a sample plot or demonstration plot.)

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Plot mgmt > Nest Nest wait * Queue On 2 Min Optimal

Example of the Current Configuration Sheet

5mm

I/O timeout

30 Min

5mm

The following is a scaled version of a DesignJet 750C/755CM current configuration sheet:

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HP DesignJet 750C/PS Printer Current Configuration
Palette A Pen Palette B Pen

Utilities > Menu mode Full

* Utilities > Statistics > Max X Max Y Code rev RAM present 4MB Opaque Bond Postcript 3.0 English Media ROM SIMM Language H.00.02b 200mm 286mm

* I/O setup > Modular > MIO * I/O setup > RS232C > Selected Lightness Factory Config A 9600 None None 9600 Margins 17mm * I/O setup > Config B Baudrate 9600 None Parity MIO Not Present

Current palette Settings Factory Pen mm color 0.35 0 0 1 0.35 1 2 0.35 2 3 0.35 3 4 0.35 4 5 0.35 5 6 0.35 6 7 0.35 7 8 0.35 8 9 0.35 12 10 0.35 19 11 0.35 27 12 0.35 35 13 0.35 68 14 0.35 100 15 0.35 110 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Plotter setup > * Lightness * Graphics language * Terminator * PostScript scale Page format >
17mm

mm 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35

color 0 1 2 3 4 5 6 7 8 12 19 27 35 68 100 110

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

mm 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35

color 0 1 2 3 4 5 6 7 8 12 19 27 35 68 100 110

Normal 7586, HPGL/2 Normal 129%

* Skew tolerance * Cartridge check Drying time

Off Off Normal

Legend: Size Inked area
Merge Items marked with an asterisk (*) appear

Pen settings > Palette * Merge Software Off

* Mirroring * Margins * Rotate

Off Normal 0

on the front panel ONLY WHEN the option Utilities > Menu mode is set to Full.

Installation and Configuration

3-13

Notes

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Installation and Configuration

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4

Preventive Maintenance

4-1

Moisture on the Plotter/Printer
Users should use the plotter in an environment between 5% and 95% relative humidity. To recover from moisture condensation, turn the plotter off, and, using the main roller as a reference, wait until the plotter is completely dry before using it again. (Other environmental specifications ' chapter 2.)

Noisy Carriage Bushing
To prevent noisy movement of the carriage, remove aluminum or dust particles from the bushing at the back of the carriage, and from the slider path along which the bushing moves.

Belt Swelling
To prevent new belts from swelling incorrectly, keep them in their bags with dissicant until you need to install them.

Cleaning the Plotter
To maintain the plotter in good operating condition, keep it free of dust accumulation, ink, and other contamination. Cleaning intervals are determined by the plotter environment and by the types of plotter supplies used. WARNING Disconnect the plotter from the power source prior to performing any cleaning. DO NOT allow liquid to run on to electrical components or circuits, or through openings in the enclosure, as this can create a shock hazard leading to death or injury.

General Cleaning
Proper general cleaning should include the following: 1 Blow away dust accumulation with compressed air if available. 2 Clean the outer surface of the plotter with a damp sponge or cloth. Use a mild soap and water solution if necessary. Do not use abrasive cleaners. 3 Wipe the plotter dry with a soft lint free cloth.

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Preventive Maintenance

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Scheduled Maintenance
In some segments of the plotter market, the customer tends to print more than the maximum number plots that the throughput allows, exceeding by far the limit of the design. When this happens the customer runs into print quality problems and continuous plotter failures. The purpose of scheduled preventive maintenance is to avoid these failures ensuring a good performance during all the product life.

Level of Plotter Usage
These are the usage limits of the plotter: D The service station and spittoons: Limited by the number of spits, wipes and primes performed which are directly proportional to the number of plots. D The Y axis: The wear of the motor depends on the number of carriage cycles. The levels of friction can increase due to dust and ink accumulation on the slider rods. Given these constraints, preventive maintenance is required when the plotter usage exceeds the following thresholds:

Number of plots: Number of carriage cycles:

20, 000 4,500,000

Customers with a normal plotter usage will not require any maintenance. During the plotter life (5 years, 220 working days per year) normal plotter use means less than (on average):

20 pages per day in CAD or 12 pages per day in LFP

Implementation
Two of the EEROM counters are assigned to counting the number of plots and the number of carriage cycles respectively. When the plotter exceeds the limits quoted above, the front panel displays the following message: Maintenance Advised" The configuration plot also conveys the usage information, and it is accessible by the user. Usage Information

Number of plots Number of carriage cycles

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Cleaning the Drive Roller
WARNING
The drive roller cleaning procedure should be performed only by HP trained personnel: otherwise personal injury may occur.

If ink is spilled on the drive roller, remove the ink. Due to the ink's reflectance, ink on the roller can disrupt the plotter's edge sensing function. To remove any ink from the roller, perform the following procedure: 1 Connect the plotter to an ac power source. 2 Hold the Enter button down and switch the plotter ON. 3 Using the arrow buttons, scroll to the utilities menu display, then press the Enter button. 4 Using the arrow buttons, scroll to the statistics submenu display. 5 Simultaneously press the Enter and the Up Arrow buttons to access the service tests menu. 6 Using the Up Arrow button, scroll to reach the following display:

SERVICE TESTS 22 X Motion control
7 Press the Enter button, and the following display will appear:

REMOVE MEDIA PRESS ENTER
8 Remove any media from the plotter. 9 Raise the window. Holding the window sensor down with a pen, pencil or small screwdriver, press the Enter button. The display will show that the arrow buttons can be used to control the roller speed for cleaning. Press the Up Arrow button several times until the drive roller reaches a convenient speed for cleaning. The speed of the roller can be reduced or increased by pressing the appropriate arrow button. 10 Apply any common household cleaning solution (water based only) to a soft, lint free rag and apply it to the drive roller surface while it is rotating. Thoroughly clean the roller surface. 11 Stop the roller by pressing the Enter button when you have finished cleaning. 12 Press the Enter button to return to the SERVICE TESTS menu display. 13 Using the Previous button, scroll to the STATUS Ready for Media" display. 14 Allow the drive roller to dry before inserting media in the plotter.

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After the maintenance is done the Customer Engineer resets the EEROM counters through the Service Menu, which clears the maintenance advised message.

Preventive Maintenance Kit C3195 60166
The preventive maintenance kit consists of:

Service station assembly Spittoon assembly Y-axis motor (Includes anti-static cloth and Isopropyl alcohol) Encoder D/A1 Encoder E/A0 Lubricant

C3195-60162 C3195-600027 C3195-60112 C4713-60098 C4714-60098 6040-0855

Y axis Maintenance Kit In addition to the wearing of the Y axis motor, the friction in this area can increase due to the accumulation of ink particles and dust from the media or the atmosphere in the vicinity of the slider rods. The Y axis maintenance kit includes a cloth and alcohol to clean the slider rods properly, and a lubricant to apply onto the rods. The most important parts to keep clean are the upper and internal sides of the rods. Procedure

Service Station
D Replace the service station. D Replace the right spittoon.

Y-axis:
D Clean the slider rods with isopropyl alcohol and antistatic cloth to remove the ink particles and dust. D Replace the Y axis motor. D Replace the encoder strip.

EEROM Counters Mandatory Zero Resets
After the repairs have been performed, follow the menu instructions to reset the plot cycle counter to zero. Reset the counter of carriage cycles when: D Y motor is replaced. D Slider rods are cleaned. D Slider rods are lubricated.

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Notes

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5

Functional Overview

5-1

Introduction
This chapter contains a simplified description of the DesignJet 700, 750C and 750C Plus plotters and DesignJet 755CM printer circuits and mechanical functions. Mechanical and Printed Circuit Assembly (PCA) overviews present a functional description of how the plotter operates.

Simplified Description of Circuits
Communications
HP DesignJet 700, 750C, 750C Plus and 755CM circuits communicate with an external controller by way of either a Bi tronics or an RS 232 C interface. Bi tronics is handled by a separate gate array. RS 232 C communications are handled by a universal asynchronous receiver transmitter (UART) and baud rate generator built into the processor support application specific integrated circuit (ASIC). If an approved modular input/output (MIO) printed circuit assembly is installed, the circuits can communicate via an HP IB interface or can be connected to a network. The main processor reads Bi tronics, HP IB, and Ethernet communications through the port it uses to read memories (ROM or DRAM).

Plotting
HP DesignJet 700, 750C, 750C Plus and 755CM plotters/printers accept plots in the following forms: D Hewlett Packard Graphics Language (HP GL). D Hewlett Packard Graphics Language 2 (HP GL/2). D Hewlett Packard Raster Transfer Language (HP RTL). The main processor converts the plot into an internal format and stores the entire plot, in its dynamic random access memory (DRAM) - except for special types of RTL plots which may begin to print while they are still being received. Then, it transfers the plot, one swath at a time, into the swath RAM via the processor support ASIC.

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Electronics Block Diagram

BITRONICS

RS-232-C

FRONT PANEL

XAXIS ENCODER

MIO CARD

MAIN BOARD

MEDIA SENSOR

PINCH WHEEL

SENSOR

XAXIS SENSOR MOTOR Y-AXIS MOTOR FAN

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Functional Overview


CARRIAGE BOARD PRIMER STEPPER MOTOR BAIL STEPPER MOTOR WIPER STEPPER MOTOR DROP DETECTOR PRIMER SENSOR POWER SUPPLY

5-3

ASICs
On the main PCA, the processor support ASIC is designed to manipulate swath data into the actual firing order for the nozzles on the four cartridges that are mounted on the carriage assembly. The processor support ASIC receives pixels from the physical swath RAM and sends them serially to the carriage ASIC. A main processor on the main PCA controls all plotter operations with the help of the processor support ASIC and the servo processor. Communications between the servo processor and the main processor take place through registers in the processor support ASIC. The processor support ASIC provides pulse width modulated signals to the Y axis (carriage axis) and the X axis (media axis) motor drivers, to drive the Y axis and the X axis motors. The linear encoder connected to the carriage PCA gives the processor support ASIC feedback about the position of the carriage. The X axis motor encoder on the X axis motor gives the processor support ASIC feedback about the position of the X axis motor. In addition, the processor support ASIC contains a DRAM controller that generates multiplexor control and enable strobes for the DRAM row and column addresses during a memory access. The DRAM controller also arbitrates between a memory request and a refresh request and performs the refresh operation.

Servo Processor
The servo processor communicates with the main processor through registers in the processor support ASIC. The servo processor writes information into the registers and sends an interrupt to the main processor. The main processor then reads the registers, and the interrupt is automatically cleared. Using this procedure, the servo processor provides the main processor with information from the plotter sensors. The sensors give the main processor the ability to check status conditions. The servo processor controls the: D D D D D D Servo motors. Front panel. Fan. Sensors. Electrically erasable read only memory (EEROM). Stepper motors.

Stepper Motors
There are three types of stepper motors: D The primer stepper motor is used to drive the nozzle primer. D The bail stepper motor drives the bail. D The wiper stepper motor drives the orthogonal wiper.

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Cartridges
A line sensor on the carriage PCA provides the servo processor with information used to align the cartridges. It also provides a media edge sensing capability to the plotter (for width measurement). The carriage ASIC controls the firing of the cartridges. It receives pixel data from the processor support ASIC over a synchronous serial channel. The carriage ASIC contains: D A 2 x 208 bit shift register (one bit per cartridge nozzle), which performs a serial to parallel conversion on the data. D Timing and sequencing circuitry to ensure that cartridge nozzles are fired in the correct sequence and at the correct time. D Fire waveform generators to create the fire pulse waveforms used to fire the cartridges. D Circuitry for controlling the temperature of the cartridge while printing (brilliant pulse warming). Cartridge drivers provide the power necessary to fire the cartridges under the control of the carriage ASIC. During cartridge testing, when the carriage is docked in the service station, the processor support ASIC provides a means to generate a fire position pulse. The carriage ASIC will receive this signal and fire selected nozzles. If a drop is sensed by the drop detector each time a nozzle is fired, the nozzle is working properly. The independently generated fire position pulse is also used for firing to clear clogged nozzles. Warm up pulses are generated when in the Warm up When Idle" mode.

Mechanical Overview
Carriage Axis Mechanism
The carriage (Y axis) motor is mounted under the plotter's right endcover. It is electrically connected to the main PCA, which contains a carriage motor driver. Its drive shaft is mechanically connected to the carriage via a drive belt. When the carriage motor rotates, it moves the carriage assembly. An optical encoder, located on the carriage assembly, provides positional feedback for carriage servo control.

Line Sensor
The line sensor on the cartridge carriage is used to: D Detect and measure lines when performing cartridge alignment and accuracy calibration. D Detect media width and skew during media loading. D Calibrate the media axis (for banding reduction) using a mark on the roller.

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5-5

Media Axis Mechanism
The media (X axis) motor is mounted under the right endcover and is electrically connected to the main PCA, which contains the media motor driver. It has a worm style pinion gear, which meshes with a gear at the right end of the drive roller. When the media motor rotates, it moves the drive roller and, consequently, the media. The encoder mounted on the motor sends feedback about the media motor position to the main PCA. In DesignJets 700, 750C Plus and 755CM the media motor has a zero position which is indicated to the main PCA via the encoder.

Primer Stepper Motor
The primer stepper motor is mounted on the plotter's left side plate and connects to the main PCA through the service station cable. It is controlled by the servo processor on the main PCA and is used to drive the nozzle primer.

Bail Stepper Motor
The bail stepper motor is mounted on the plotter's left side plate and connects to the main PCA through the service station cable. It is controlled by the servo processor on the main PCA and is used to drive the bail.

Wiper Stepper Motor
The wiper stepper motor is mounted on the service station and connects to the main PCA through the service station cable. It is controlled by the servo processor on the main PCA and is used to drive the orthogonal wiper.

Fan
An internal cooling fan is supplied with +12 V It is switched ON and OFF by the servo . processor and is mounted in the electronics enclosure at the rear of the plotter. The fan is primarily used to cool the power supply PCA and the main PCA when plotting.

Window Sensor
The window sensor is a mechanical switch mounted on the right side plate at its top front edge. Feedback about the window's position (up or down) is sent to the main PCA through the front panel.

Pinch Wheel Sensor
An optical pinch wheel sensor is mounted on the lower rear portion of the plotter's right side plate and is electrically connected to the main PCA. When the pinch arms are raised, a cam in the pinch arm lift mechanism interrupts the beam of the optical sensor, and, when the pinch arms are lowered, the beam path is cleared. Thus, the position of the pinch wheel can be determined from the electrical state of the sensor.

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Media Sensor
The media sensor is an optical sensor and is mounted towards the right end of the entry platen. Two articulated levers block the optical path between the emitter and the receiver when media is not loaded. When media is loaded, both levers are rotated, thus clearing t