HP Designjet T1120, Designjet T1100, Designjet T610 service manual

HP Designjet

T1100/T1100ps/T610/

T1120/T1120ps

Printer Series

Version 6

March 19, 2009

For HP I nternal Use O nly

©Copyright Hewlett-Packard Company 2009

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

Version 6: March 19, 2009

Warranty

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

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

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

WARNING

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

Electrical Shock Hazard

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

- Ensure that the ac power outlet (mains) has a protective earth (ground) terminal.

- Disconnect the Printer fr om the power source prior to performing any maintenance.

- Prevent water or any other liquids from running onto electrical components or circ uits , or through openings in the enclosure.

Electrostatic Discharge

Refer to the beginning of Chapter 4of this manual, for precautions you should take to prevent damage to the Printer circuits from electrostatic discharge.

WARNING

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

CAUTION

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

Content Management Department, Barcelona Division, Hewlett-Packard Espanola, S.A. Avda. Graells, 501 08190 Sant Cugat del Valles Spain

Safety Symbols

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

Table of Contents 1

1 Troubleshooting 2 System Error Codes 3 Service Tests and Utilities 4 Service Calibrations 5 Parts and Diagrams 6 Removal and Installation 7 Preventive Maintenance

For info rmation about Using this Manual, please refer to the next page.

HP Designjet T Series — Service Manual -1

Table of Contents

Using this Manual

Purpose

This Service Manual contains information necessary to test, calibrate and service:

 HP designjet T1100 Printer 24 inch (Model Q6683A)  HP designjet T1100 Printer 44 inch (Model Q6687A)  HP designjet T1100ps Printer 24 inch (Model Q6684A)  HP designjet T1100ps Printer 44 inch (Model Q6688A)  HP designjet T610 Printer 24 inch (Model Q6711A)  HP designjet T610 Printer 44 inch (Model Q6712A)  HP designjet T1120 Printer 24 inch (Model CK837A)  HP designjet T1120 Printer 44 inch (Model CK839A)  HP designjet T1120ps Printer 24 inch (Model CK838A)  HP designjet T1120ps Printer 44 inch (Model CK840A)

For information about using these printers, refer to the corresponding User and Q

uick Ref erence Guides.

Readership

The procedur es de sc r ibed in this Se rvi ce Manual ar e to be perfor med b y HP Certi fied service personnel only.

Part Numbers

Part Numbers for Printer options, accessories and service parts are located

Chapter 5 Parts and Diagrams on page 5-1.

Conventions

Any text that uses the blue underlined format (except this one) is a link that directs you to the page number of the reference. If you are viewing the document as a pdf, you can click on that link to be taken there directly.

-2 HP Designjet T Series — Service Manual

Troubleshooting 1

Using the Front Panel 1-3 General Troubleshooting 1-4

Introduction 1-4 Troubleshooting System Error Codes 1-4 Performing a Service Test on a failed Assembly 1-4 Performing the Necessary Service Calibrations 1-4 The Front Panel is blank 1-5 Solving Print Quality Problems 1-5 The Printer does n ot Power ON 1-5 The Printer Continuously Rejects Printheads 1-5 Cover Sensors are not Working 1-5 The Line Sensor ha s Problems Detecting Media 1-5 Banding at variable extreme environmental conditions 1-6 Worm marks on HP Coated media with light area fills 1-6 Solving Media-Handling Problems 1-7

Print quality troubleshooting 1-9

Print Quality Troubleshooting Actions 1-9 The Servi ce Image Quality Diagnostic Print 1-9 Reading the Diagnostic Print Results 1-11

Diagnostic Part 1: Printhead Reliability 1-11 Diagnostic Part 2: Printhead Alignment 1-12

Diagnostic Part 3: Printheads & Paper Advance 1-13 The Advanced Diagnostic Prints 1-15 Reading the Advanced diagnostic Print Results 1-16 Troubleshooting Print Quality Problems 1-24

Print Quality General Advice 1-24

Horizontal Lines Across the Image (Banding) 1-25

Lines are Missing, Too Thin, or Too Thick 1-26

Problems with Stepped Lines 1-27

Lines are Printed Double or in Wrong Colors 1-27

Lines are discontinuous 1-28

Lines are Blurred (Ink Bleeds from Lines) 1-28

Problems with Graininess 1-29

Paper is not Flat 1-29

Ink marks on the paper 1-30

Horizontal smears on the front of coated paper 1-31

Ink marks on the back of the paper 1-31

Problems with the Edges of objects 1-32

Stepped or not sharp 1-32

Darker than expected 1-32

Black and white prints do not look neutral 1-32

Horizontal lines at the end of a c u t sheet print 1-32

Verti cal lines of different colors 1-32

White spots on the print 1-33

HP Designjet T Series — Service Manual 1-1

Problems with Color Accuracy 1-33

Output Only Contains a Partial Print 1-34

Problems with Image Clipping 1-34

Some objects are missing from the printed image 1-35

A PDF file is clipped or objects are missing 1-35 Print Quality Troubleshooting Wizard 1-35

Ink Supplies Troubleshooting 1-39

Introduction to ink supplies 1-39

What are Ink Supplies? 1-39

Ink Cartridges 1-39

Available Ink Cartridges 1-40

Printheads 1-40

Available Printheads 1-41

General Information About the Ink Supplies 1-41

General Precautions When Handling Ink Supplies 1-41

When Should You Replace the Ink Supplies? 1-42 Ink Cartridge Levels, Information, and Replacement 1-42

Ink Cartridge Le vels 1-42

“View Ink Levels” Direct Access Key 1-42

“View Ink Levels” from the ink menu 1-42

Obtaining Ink Cartridge Information 1-42

The printer consumes more gray ink ink than M, C, or Y 1-44

Changing an Ink Cartridge 1-44 Printhead Information, Replacement and Alignment 1-46

Obtaining Printhead Information 1-46

Changing a Printhead 1-47

Aligning Printheads 1-49

Reinsert Printheads Procedure 1-49

Image Quality Maintenance Procedure 1-49

Scanning errors during alignment 1-50 Ink Cartridge and Printhead Status Messages 1-50

Ink Cartridge Status Messages 1-50

Printhead status messages 1-51

Printhead Error Codes 1-51 Solving Ink Supplies Problems 1-53

You Cannot Insert the Ink Cartridge Into the Printer 1-53

You Cannot Insert the Printhead Into the Printer 1-53

The front panel says to reset or replace a printhead 1-53 Maintaining and Cleaning the Pr intheads 1-54

Clean the printheads 1-54

Flex Contacts Cleaning Tool 1-55

HP Designjet T Series — Service Manual 1-2

Using the Front Panel

Below is a diagram of the front panel.

Using the Front Panel

View Loaded Paper

Unload Paper

Key Function

 Arrow Keys

Use the Arrow keys to scroll through a menu or toggle between YES or NO wh

 Cancel

Use the Cancel key to abort or stop a procedure or reject test results.

 OK

Use the OK key to select a menu option.

 Power

Use the Power key to turn the printer ON and OFF.

 Menu

Use the Menu key to enter the main menu.

 Back

Use the Back key to go back to the previous menu or reject test results.

View Ink Levels

Form Feed and Cut

en prompted.

Up and Down

Cancel

Power

Back

Service Key Combinations

 Diagnostic mode

With the printer OFF, press and hold the UP and OK k e y s. While holding the Up and OK k printer. Hold all three keys un til the Power key stops flashing, usually about 5 seconds.

eys down, press and hold the Power key to tur n on the

 Service Menu (Service Engineers Only)

From the main menu, press and hold the Up and Cancel keys.

 Service Menu (For users)

From the main menu, press and hold the Down and Cancel keys.

HP Designjet T Series — Service Manual 1-3

Troubleshooting

General Troubleshooting

Introduction

This chapter will guide you through the relevant steps to take when troubleshooting the printer.

Troubleshooting System Error Codes

Chapter 2 System Error Codes on page 2-1 contains a list of system error

codes and their respective descriptions and recommended corrective

ons. Only try one recommended action at a time and c heck if the error

acti code has disappeared.

If you have an error code which is not documented in this Service Manual or yo

u have an error which you cannot resolve, then report the error to the HP Response Center or the nearest HP Support Office. When reporting the error, have the following information ready:

 Model and Serial Number of the printer.  Which firmware revision the printer is using (See Note below). Check

firmware in Utilities / Statistics / Code rev.

 The complete error number (See Note below).  The Service Configuration Print.

The Current configuration sheet.



 Which software application the customer is using (name, version, etc.).

When reporting the System Error Code, make sur e that you

supply the full Error Code and the firmware version.

Without this information, HP Support Personnel cannot help

you.

Performing a Service Test on a failed Assembly

If possible, always perform a Service Test on the component/assembly that you are about to replace, just to make sure that is the component/assembly that has failed.

If the test on that component/assembly passes, you should

NOT replace it.

For inf ormation on the Service Tests and how to use them see Chapter 3

Service Tests and Utilities on page 3-1.

Performing the Necessary Service Calibrations

Is the printer calibrated correctly after replacing a component? For information on the Serv ice Calibrati ons and how to use them s ee

Service Calibrations on page 4-1.

Remember that certain Calibrations are required even if an

Assembly has been disassembled to gain access to another

Assembly or Component.

Chapter 4

1-4 HP Designjet T Series — Service Manual

Solving Print Quality Problems

Whenever a Print Quality problem appears, it is ad visable to print the Diagnostic Pr int to help di agnose the problem. The Di agnos ti c Pr int w ill he lp you differ entiate between po ssible prin thead err ors and other pr oblems such as incorrect front-panel selection, driver or RIP configuratio n or mechanical problems.

The Front Panel is blank

1 See What to do if the Front Panel is blank on page 2-3.

The Printer does not Power ON

1 Check that the power cord is connected correctly to the Printer and to the

Power Socket.

heck that the Power Switch on the BACK of the Printer is in the ON

2 C

position.

3 Chec 4 C

k to see the LED on the Front Panel Power Switch are On.

heck that the Front-Panel Cable is correctly connected to the Electronics

Module. Also make sure that the Front-P anel cable is not damaged.

General Troubleshooting

eplace the Power Supply Unit. See Starwheel Assembly on page 6-208.

5 R

The Printer Continuously Rejects Printheads

1 Clean the flex contacts on the Pr inthead and in the Carr iage Ass embly using

the Carriage Interconnect Wiper and try again. See

Tool on page 3-20.

2 If A

LL the Printheads are r ejec ted (the status mes sage on the Fr ont Panel does NOT sho w "OK" for ALL the Printheads) then perfor m the Elec tronic Module Test. See

3. Electronics Module on page 3-21.

Cover Sensors are not Working

1 Perform the Sensors Test. See 5. Sensors on page 3-31.

heck if the cable for the faulty sensor is not damaged and is connected

2 C

correctly.

eplace the faulty Sensor.

3 R

The Line Sensor has Problems Detecting Media

1 Check the type of media that is being u sed since the Line sensor may have

problems detecting transparent media or some types of Non-HP media. Try loading white HP media in to the Print er and chec k if the Line sensor detects it.

he Line Sensor is not calibrated correctly. Perform the Line Sensor

2 T

Calibration. See

Line Sensor Calibration on page 4-15.

Flex Contacts Cleaning

he Line Sensor is damaged or faulty. Replace the Line Sensor. See Line

3 T

Sensor (T1120/T1120ps) on page 6-157.

HP Designjet T Series — Service Manual 1-5

Troubleshooting

Troubleshooting Media Jams/Printhead Crashes

The failure modes "media jam" and "head crash" are grouped together because in many cases a media jam causes the media to lift up into the Carriage path and cause a Printhead cr ash, thus causing many media jam failures to be reported as head crashes.

d the media jam occur when loading media?

1 Di

 If the client has had media jams, it is common for pieces of media to get

stuck in the media path. Clear the media path.

When clearing a media jam, sometimes media is stuck in the paper path. To clear this, you must lift the Media Lever and insert thicker media into the paper path to push out the media that is still stuck there.

2 Is the customer using non-HP media?

 The use of non-HP media can easily be the cause of media jams and

head crashes (es pecially head crashes because HP media is specially formulated to a vo id cockle , one of the primary caus es of head cr ashes). If the media is not HP approved, advise the cust omer t o us e HP media and check to see if the problem is now solved.

Banding at variable extreme environmental conditions

Since the Accuracy Calibration has been done at normal environmental conditions, printing in extreme en vironment al conditions will cause banding because the advance of the Media Advance Roller does not correspond to the same conditions that the calibration was done in. To solve the problem, try the following:

Pe rfor m the Acc u rac y Calibr ati on in the new en v i r onmental conditi ons (R ef er

User’s Guide).

the

Worm marks on HP Coated media with light area fills

Light bands (S-shaped) in P aper axis direction where light area fills are printed, causing unacceptable Image Quality defect.

 Print the Service Configuration Print and check if the le vel of Humidity is

very low (below 30%). Increasing humidity may help in reducing the severity of the problem.

The media is causing t h e problem and NOT the Printer. Do not attempt to try and replace Printer parts to solve this problem.

1-6 HP Designjet T Series — Service Manual

The Media Basket was damaged during printer setup

1 There are three plastic parts that could br eak during printer installation and

need replacing.

2 Check the parts table and graphics in P

service parts you must order. See

3 Replace the component. See

Solving Media-Handling Problems

The Front Panel indicates that media is misaligned or incorrectly positi oned

Roll media

 The roll may be loaded the wrong way. The paper should load over the

roll toward you.

 Check that the paper is correctly loaded onto the spindle.  The paper may be loaded at an angle. The right-hand edge must be

aligned with the blue line on the Print Platen.

With 24 inch printers, ensure that the paper is wrapped tightly on the roll. This is a very important step to remember because if this is not done, the media may be loaded at an angle, causing the media to be rejected.

 Check that the Right Spindle Holder (rewinder included) is properly

attached and screwed to the printer. For 44 inch printers, the Rewinder, locate

(rewinder included), should maintain proper back tension. If the Right Spindle Holder (re winder included) is misaligned or not properly attached to the printer, the Rewinder will not function properly.

For a gra phic of a properly installed Rewinder, see

and Rewinder (T1120/T1120ps) on page 6-87. To further diagnose

problems with the Rewinder, see

arts and Diagrams to identify what

Printer Support on page 5-2.

Bin Assembly on page 6-10.

d on the Right Spindle Holder

Right Spindle Holder

6. Rewinder on page 3-34.

Sheet media

 Always load sheet media using the Rear Input Tray. Do NOT load the

media as you would load roll media.

 It must be loaded with the right-hand edge against the blue line on the

Print Platen.

 The media may be crumpled or warped or may have irregular edges.  If hand-cut media is used, the edges may not form a right-angle or they

may be rough. If possible, hand-cut media should not be used. Only purchased sheet media should be used in the Printer.

 If you have problems with paper jams, check that the Overdrive is not

obstructed by bits of paper or using the Turn Drive Ro ller Service Utility.

1. Turn Drive Roller on page 3-58.

See

Check that the Ri ght Spindle Holder (r ew inder incl uded) is prope rly attac hed and screwed to the printer.

For 44 inch printers, the Rewinder, located on the Right Spindle Holder

winder included), shoul d main tain proper back tension. If the Right

HP Designjet T Series — Service Manual 1-7

The Media Basket was damaged during printer setup

Spindle Holder (re winder inc luded) is misaligned or not proper ly attached to the printer, the Rewinder will not function properly.

To further di agnose problems with the Rewinder, See

3-34.

6. Rewinder on page

HP Designjet T Series — Service Manual 1-8

Print quality troubleshooting

Print Quality Troubleshooting Actions

For some Print Quality problems, a Call Agent can try and troubleshoot the Printer by requesting the Customer to perform certain actions. Using this process, most problems can resolved without the need of an on-site visit.

Use the Print Quality Troubleshooting Wizard to help customers with their print quality or color problems. For information about how to use the Print Quality Troubleshooting Wizard, see Print Quality Troubleshooting Wizard

on page 1-35.

When faced with a Print Quality problem, perform the follo wing actions in order to resolve the problem:

1 Printer Configuration:

 Check that the paper type loaded cor res ponds to the paper type s elected

in the front panel and in the software. You can verify the paper type selected through the Front Panel (Main Menu/Paper menu/View loaded paper).

 Make sure that the correct Print Quality settings are used for different

types of print content . See

1-9 for further information.

 Dry time should be set to “Optimal”.

Print Quality Troubleshooting Actions on page

Print quality troubleshooting

2 Perform Printhead recovery (Main Menu/Image Quality Maintenance/

lean Printheads).

3 Media:

 Select the correct media type thr ough the front panel when loading it.  Make sure that HP or HP-approved media is being used.

4 Perform the Printhead Alignment (Main Menu/Image Quality Maintenance/

lign Printheads), using the same paper type with which you were

A experiencing unacceptable image quality, if feasible (some paper types are not suitable for Printhead Alignment).

heck if the latest version of the firmware is

5 C

firmware revision .

The Service Image Quality Diagnostic Print

What is the Service Image Quality Diagnostic Print?

The Printer contains an internal Image Quality Test which helps you to diagno Diagnostic Print is available in the following options:

1 Image Q

detail the possible source of any image quality defects. It is accessible through the Service Utility Menu.

se the possible source of any image quality defects. The Service IQ

ality Service Best Plot. This plot helps you to diagnose in more

installed. If not, install the latest

HP Designjet T Series — Service Manual 1-9

Print quality troubleshooting

The Image Quality Service Best Plot uses the Best Print Mode and is divided in to three parts as follows:

 Diagnostic Part 1: Printhead Reliability Test. The purpose of this test is to

identify which Printh ead is faulty.

 Diagnostic Part 2: Printhead Alignment Te st . T his test is de signed to chec k

any color-to-color and bi-directional misalignment the printer may have.

 Diagnostic Part 3: Printheads and Paper Advance test. This test is

designed to check w hether the Printheads and the Media Advance Mechanism are working correctly.

2 Image Qu

Quality Service Best Plot but uses the Normal Print Mode.

3 Advanced Diagnostic Plot.

defects that we could find in the Image Quality Service plot. For more information, see

Considerations for Printing the Diagnostic Print

he IQ Diagnostic Print prints in A3 and B sizes so you must have media

1 T

aded (roll or sheet) that is this size or larger.

2 Use the same type of media that the cust omer was using when they found

the image q

3 If the customer is using non-HP media and after the Image Quality T est you

till have the same image quality problems, change to genuine HP media

s and repeat the Image Quality Test.

If you do see problems with the Image Quality Test, continue with the Ad

vanced Diagnostic procedures w hich will help you diagnose the pr oble m .

Printing the Diagnostic Print

1 In the

ality Service Normal Plot. This plot is the same as the Image

These tests provide mor e information of the IQ

The Advanced Diagnostic Prints on page 1-15.

uality problem.

Service Utilities submenu, scroll to “Diagnostic Print” and press OK.

2 You will be given three options. Use the Arrow keys to make the selection

and press the OK key to start printing the required Diagnostic Print or to enter the Advanced Diagnosti cs menu.

3 If you selected the Advanced Diagnostics Prints in the previous step, use the

Arrow keys to make the required selection Paper Advance, Printhead

HP Designjet T Series — Service Manual 1-10

Print quality troubleshooting

Alignment Diagnostic , Nozzle Health, For ce Drop Detecti on or Print Banding Plot, and press the Enter key to start printing.

4 Make sure media is loaded, the Media Lever is lowered and that the Ink

System is cor rec tl y installed . Pr es s the OK ke y t o print the Di agnosti c Pr int or press Back/Cancel to exit without printing the Diagnostic Print.

5 The selected Diagnostic Print will now be printed.

Reading the Diagnostic Print Results

Diagnostic Part 1: Printhead Reliability

The Nozzle Print Test test is designed to check if the Printhead nozzles print corr

ectly.

The nozzles check (top of the plot) is printed in a one-pass full swath mode. Th

e diagnostics test prints out every single nozzle of each Printhead without

applying an error hiding or alignment algorithm. For each Printhead, you can see both the adjacent and the consecutive

nozz

les.

If any nozzles are not printing correctly they will be shown on the right of each Printhead Nozzle test. Ther e i s a ser ies o f number ed s tepped diagonal lines. If one or more of the nozzles are clogged, malfunctioning or mispositioned, you will see that the stepped lines are broken or misdirected in one or more places.

HP Designjet T Series — Service Manual 1-11

Print quality troubleshooting

Below, the stepped lines highlighted in yellow are broken. When the line is completely broken, this means the nozzle is out.

Below, the stepped lines highlighted in yellow are misdirected. When the line is misdirected, this means the nozzle is malfunctioning or out of position.

On the left of each Printhead Nozzle test, there is a series of horizontal

raight lines. If one or more nozzles are misdirected there will be unequal

st spaces between the corresponding lines.

Corrective Action

If the printer has nozzle defects , y o u can s The printer can automatically compensate for nozzle defects, so there is no need to replace the Pr inthead.

The method of improving Nozzle Defects is to:

1 Recover the Printheads, using the Front Panel Main Menu/Image Quality

Main

tenance/Clean Printheads option.

2 Reprint the Printhead Nozzles Test Plot to verify that the defective nozzles

ve been corrected.

3 If the problem continues, replace the defective Printhead.

agnostic Part 2: Printhead Alignment

This test is designed to check any color-to-color and bi-directional misali

gnment the printer may have.

till get perfect print quality results.

HP Designjet T Series — Service Manual 1-12

Print quality troubleshooting

1 If the Printer is experiencing horizontal misalignment problems, the

Alignment Test will show something like this:

2 If the Printer is e xper ienc ing vertical misalignment problems , the Ali gnment

Test will show something like this:

3 If the Printer is experiencing bi-directional misalignment problems, the

Alignment Test will show something like this:

Corrective Action

Perform the Printhead Alignment (Main Menu/Image Quality Maintenance/ Al

ign Printheads), using the same paper type with which you were experiencing unacceptable image quality, if feasible (some paper types are not suitable for Printhead Alignment).

Diagnostic Part 3: Printheads & Paper Advance

This test is designed to c heck w hether the Pr intheads and the P ape r Adv ance

anism are wor king corr ectl y. This part of the Image Quality Test should

Mech NOT be used to check for color consistency or accuracy.

HP Designjet T Series — Service Manual 1-13

Print quality troubleshooting

Banding

If the Printer is experiencing a banding pr oble m, you will see repetitive horizontal bands within the printed image.

 Darker horizontal bands or lines repeated along the vertical band (from

top to bottom at the same distance).

 Whiter horizontal bands or lines along the vertical band (from top to

bottom at the same distance).

The plot is printed in Best or Normal mode (according to the menu option se

lected) with Err or Hiding ON. T he top band has 100% ink density patches while the bottom band has 50% ink density patches.

Troubleshooting Banding Problems

If banding does Printhead problem. In this case, try the following:

Check that the appropriate print quality settings are being used (refer to the User’s Guide for more information)

2 Recover the printheads using the option through the Front Panel (Main

Menu/Image Quality Maintenance/Clean Printheads). Reprint the Diagnostic Print or the pr int file and if the pr oblem persists , replace the f aulty Printhead.

If banding does o Advance problem :

NOT occur in ALL the colors, then it is more than likely a

ccur in ALL the colors, then it is more than likely a Paper

 If the bands are light, it means that the paper has advanced too much.  If the bands are dark, it means that the paper hasn’t advanced enough.

HP Designjet T Series — Service Manual 1-14

Print quality troubleshooting

 In high quality modes, graininess in ALL colors can indicate problems

either with alignment or Paper Advance.

Corrective Action

In order to solve problems that result in banding, try the following:

heck that the appropriate print quality settings are being used (re fer to the

1 C

User’s Guide for more information).

2 Chec

3 If

4 P

k that the loaded media is the same type as selected in the printer. You can verify the media type selected through the F ront Panel (Main Menu/ Paper menu/View loaded paper).

the customer is using low quality paper, try recommending better quality paper (preferably HP paper). Printer performance can only be guaranteed by using recommended papers.

erform the Paper Advance Calibration using the same type of paper that will be used f or the final print (Main Menu/Image Quality Maintenance/ Paper Advance Calibration/Calibrate Paper Advance).

If there is white point banding in o cannot be fix ed using the Pr inthead r ecov eri es, in s ome cases using the for ce a drop detection option can f i x this issue . See

1-24.

nly one color band and the problem

Force Drop Detection on page

No Printing Defects Found in the Diagnostic Print

If all the test patterns from the Diagnostic Print are correct and you still e

xperience Image Quality problems, you can use the following procedures to resolve the problem.

 Reading the Advanced diagnostic Print Results  Printhead Alignment  Nozzle Health  Force Drop Detection

The Advanced Diagnostic Prints

What are the Advanced Diagnostic Prints?

Advanced Diagnostic Plot. defects found in the Image Quality Service plot.

The Adva

 Visual Media Advanced Diagnostic. Used to check advance reliability.  Printhead Alignment Diagnostic. Used to check pen alignment reliability.  Visual Nozzle health Diagnostic. Used to check nozzle health reliability.  Force Drop Detection . Used to reset the nozzle health historic data base

nced Diagnostic Plot is divided into the following parts:

and force new drop detection.

These tests provide mor e information of the IQ

HP Designjet T Series — Service Manual 1-15

Print quality troubleshooting

Printi ng the Advanced Diagnostics Print

1 In the Service Utilities submenu, scroll to “Diagnostic Print” and pr ess OK.

2 Y ou w ill be giv en thr ee options . Us e the Arrow ke y s to select the A d vanced

Diagnostics menu.

3 From the displayed options, use the Arrow keys to make th e required

selection Paper Advance, Printhead Al ignment Diagnostic, Nozzle Health, Force Drop Detection or Print Banding Plot, and press the OK key to start printing.

4 Make sure media is loaded, the Media Lever is lowered and that the Ink

System is cor rec tl y installed . Pr es s the OK ke y t o print the Di agnosti c Pr int or press Back/Cancel to exit without printing the Diagnostic Print.

5 The selected Advanced Diagnostic Print will now be printed and, if

necessary, automatically scanne d.

Reading the Advanced diagnostic Print Results

Paper Advance

This plot helps you to visually check any You use it to pr ecisely measure the media adv ance er ror with a one dot r ow accuracy, and to verify the stability of the media advance.

alignment problems of the printer.

HP Designjet T Series — Service Manual 1-16

Print quality troubleshooting

The whitest vertical line should be positioned in the 0 offset column with minor variatio ns between +2 and -2 columns. If the offset is not positioned on the 0 column or between +2 and - 2 col umns and the whitest vertical

varies greatly, the printer requires Image Quality Maintenance/Paper Advance C Advance).

It is very important to verify that the loaded media is the same media type as selected in the front panel. You can verify the media type selected through the Front Panel (Main Menu/Paper menu/View loaded paper). The wrong type of paper selected will produce an offset error in the Paper Advance.

Paper Advance Calibration (Main Menu/

alibration/Calibrate Paper

HP Designjet T Series — Service Manual 1-17

Print quality troubleshooting

The following plot shows correct media advance, there is a straight white line positioned close t o the 0 column for the majority of the points.

HP Designjet T Series — Service Manual 1-18

Print quality troubleshooting

The follo wing plot show s a bad media ad v ance , ther e is a str aight w hite line positioned clo se to the -6 colu mn, ins tead of the 0 column for the major ity of the points.

Corrective Action

To fix Paper Advance problems, try the following:

1 Check the Paper Advance Calibration Status. This can be done by going to

Main Menu/P displays the Paper Advance Calibration status. There are three status messages:

aper/View Loaded Paper. At the bottom, the Front Panel

 DEFAULT. The paper loaded is recognized as HP paper, which is

already optimized and calibrated for the printer. Do Not calibrate the Paper Advance for this paper.

 RECOMMENDED. The paper loaded is NOT recognized as HP paper,

and Paper Advance values have NOT been customized for this paper type. In this case, calibrate the Paper Advance from the user menu.

 OK. This indicates that the paper loaded has been calibrated be fore. If

the printer continue s to ha ve banding and grainine ss pr oblems , calibr ate the Paper Advanc e from the user menu.

Whenever the printer's firmware is upgraded, the paper advance c alibration values will be reset to factory default.

HP Designjet T Series — Service Manual 1-19

Print quality troubleshooting

2 To calibrate the Paper Advance from the user menu, go to Main Menu/

Image Quality Maintenance/Paper Advance Calibration/Calibrate

Paper Advance.

It is very important to verify that the loaded media is the

same media type as selected in the front panel. You can

verify the media type selected through the Front Panel (Main

Menu/Paper menu/View loaded paper). The wrong type of

paper selected will produce an offset error in the Paper

Advance.

Some paper types are not suitable for Paper Advance

Calibration. Do NOT use colored papers or transparent

materials such as translucent bond, clear film, matte film,

tracing paper, or vellum.

Paper Advance calibr ation from the user menu will only calibrate the Paper Advance for the paper type loaded in the printer at that moment.

3 If Calibrate Paper Adv ance has mo stly solved the problem, try Adjust Paper

dvance to fine tune the Paper Advance (Main Menu/Image Quality

A Maintenance/Paper Advance Calibration/Adjust Paper Advance).

Select the per centage of change from -100% to 100%. To correct light

, dec

banding percentage.

he Paper Advance calibration from the service menu will calibrate the

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aper Advance for ALL paper types. This action is recommended when:

rease the percentage. To correct dark banding, increase the

 The Paper Advance calibration from the user menu does NOT solve the

problem.

 The Paper Advance problems affect ALL paper types.

The procedure for P aper Advance Calibration from the service menu is docu

mented in Chapter 5, Service Calibrations. See

Calibration on page 4-6.

Paper Advance

Printhead Alignment

To ensure you obtain meaningful results, use the s am e type of media that the customer was using when they encountered the image quality problem.

This plot helps you to visually check any alignment problems of the printer. You use it to precisely measure the alignment error with a 3 dot row accuracy. For the printer to be considered correctly aligned, the results must be within ±3 dot row.

HP Designjet T Series — Service Manual 1-20

Print quality troubleshooting

The illustration shows the complete Printhead Alignment that identifies each of the specific alignment test results covered.

a b

The Printhead Alignment Diagno stic pr int sho ws the f ollo w ing di agnosti c tes t results:

a Line Sensor Calibration b Pen to Pen Align c Carriage thetaZ d Bidirectional align (high) e Bidirectional align (Low)

or tests a, b, and c, the order of the color band is:

For tests e and f, the order of the color band is:

Once the printer has correctly printed and scanned the Printhead Alignme nt Diagnostic print , the F r ont P anel displa ys the r esults. T he top ro w displa ys the printhead, and the left column displays the test.

HP Designjet T Series — Service Manual 1-21

Print quality troubleshooting

The results are seperated onto two scree ns. U se the Arrow keys to di splay the second resul t s screen.

Any printhead w ith a test r esult containing a number that is not wi thin the ±3 dot row range i s mi sali gne d .

The mK printhead is used as a reference to test the other printheads. If all the printheads fail the Pen to P en tests, it is the mK printhead that is misaligned.

Reading the Printhead Alignment Diagnostic Print

The following plot shows correct printhead alignment for all patterns. The cl

ear band is in the center of the pattern.

The following plot shows bad printhead alignment. The clear band is not in the center of the pattern.

Corrective Action

 If any of the printheads are misaligned beyond the ±3 dot row range,

perform a Printhead Alignment. See

Aligning Printheads on page 3-14.

 If a Printhead Alignment does not correct the problem, replace the bad

printhead.

HP Designjet T Series — Service Manual 1-22

Print quality troubleshooting

If the customer is using non-HP media and after the Image Quality Test you still have the same image quality problems, change to genuine HP media and repeat the Image Quality Test. The best alignment calib ration is obtained using HP Photo Paper.

Nozzle Health

The print contains three separate parts.

b c

a The Variable Frequency Nozzle health plot with odd/even nozzles

separation. This is used to detect misdirected nozzles, weak nozzles, or nozzles not working correctly at all frequencies.

b Inspector measuring tool test plot.

Test b should NOT be used by Service Engineers.

c Nozzle Print Test which is als o part of the Image Quality Service P lot.

This test is designed to check that the Printhead nozzles print correctly. The test prints out e very single nozzle of each Printhead. No er ror hiding or Printhead Alignment algor ithm is applied. For each Printhead, you can see both the adjacent and the consecutive nozzles.

This is what you would see in the No

zzle Print Test part if there are

nozzles not printing correctly:

1 On the right of each Printhead Nozzle test, there is a series of numbered

tepped diagonal lines. If one or more of the nozzles are malfuncti oning or

s mis-positioned, you will see that the stepped lines are broken or misdirected in one or more places.

n the left of each Pr inthead Nozzle test, there is a series of horizontal

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traight lines. If one or more nozzles are misdirected there will be unequal spaces between the corresponding lines.

Corrective Action for Nozzle Defects

If the printer has nozzle defects, it do

es not mean that you will not get perfect print quality results. The printer has automatic procedures to hide many nozzle defects.

ecover the Printheads using the option through the Front Panel (Main

1 R

men

u/Image quality maintenance/clean printheads).

HP Designjet T Series — Service Manual 1-23

2 Reprint the Nozzle Print test to check that the defective nozzles have been

corrected.

3 If the problem continues, replace the defective Printhead.

Force Drop Detection

If the N one color that cannot be fixed with a printhead recovery, you can use this option to resolve the problem by resetting the nozzle health data base so that all nozzles are assumed to be correct.

Once the nozzle health data base has been reset drop detection is forced. The normal cause of this white point banding in

incorrect detection of failed nozzles by the drop detector.

ozzle Print Test plot has persistent white point banding in only

Troubleshooting Print Quality Problems

Print Quality General Advice

o achieve the best performance from the printer, only genuine HP

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accessories and supplies should be used.

2 Mak

e sure that the paper type selected in the Front Panel is the same as

the paper type loaded into the Printer.

Print quality troubleshooting

a single color is the

3 Mak

4 Chec

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e sure to use the most appropriate print quality settings for your purposes. A lower print quality is likely to be seen if the print quality slider has been moved to the Speed end of the scale, or the custom quality level set to Fast.

k that the environmental conditions (temperature, humidity) are within the temperature/humidity range as specified for the Printer (refer to the User’s Guide for more information).

heck that the ink cartridges and printheads have not exceeded their

expiration dates.

HP Designjet T Series — Service Manual 1-24

Print quality troubleshooting

Horizontal Lines Across the Image (Banding)

Description of problem

When you look at the image you have pr acros s the image. Shown be low is an example of what y ou might see if you have this problem:

inted, there are horizontal lines

Corrective Action

1 Check that the paper type loaded corr es ponds to the paper ty pe s elect ed in

front panel and in the software. You can verify the paper type selected

the through the Front Panel (Main Menu/Paper menu/View loaded paper).

heck that the appropriate print quality settings are being used (re fer to the

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ser’s Guide for more information) and reprint the image. In some cases print quality problems can be resolved by selecting a higher print quality level.

int the Service Image Diagnostics Print, and clean any printheads that

3 Pr

need c

leaning. Reprint the job in case the problem has been solved

4 Check the paper advance calibration status. If the status is PENDING,

perform the Paper Advance Calibration (Main Menu/Image Quality Maintenance/Paper Advance Calibration/Calibrate Paper Advance).

fter calibration reprint the job.

5 A 6 Watc h the printe r carri age when it r eac hes the end of its s w ath. If ther e is an

une

xpected delay, this may cause the banding.

This delay is possibly the result of the following:

 The user is performing tasks with other appli cations while pr inting

(particularly image processing applications). These applications are using too many computer resources, and the computer cannot effectively process the print job.

 The file to be printed is complex, and the computer does not have the

capacity to print such complex files.

HP Designjet T Series — Service Manual 1-25

Print quality troubleshooting

 If printing over a LAN, it is possible that the LAN is too slow to meet the

requirements of the print job.

If this is the case, the following corrective measures can be taken:

1 Do not use the computer while printing. Close applications that use a large

amount o

2 Convert the f ile PDF. Formats like PDF require less resources to print, which

Lines are Missing, Too Thin, or Too Thick

Description of problem

Shown below is an example o f w hat you might s

f computer resources.

y solve your banding problem.

ee if you have this problem:

Corrective Action

1 Check that the paper type loaded corr es ponds to the paper ty pe s elect ed in

front panel and in the software. You can verify the paper type selected

the through the Front Panel (Main Menu/Paper menu/View loaded paper).

heck that the appropriate print quality settings are being used (re fer to the

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ser’s Guide for mor e inf ormation). Select the c u stom print q uality options in the Print dialog, and if you are using best quality and glossy paper, try turning on the Maximum detail option. Reprint the job in case the problem has been solved.

3 If the r

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6 U

esolution of the image is greater than the printing resolution, a loss of

line q

uality may be seen. You can find the Max. Application Resolution option in the Windows driver dialog's Advanced tab, under Document Options > Printer Features. Reprint the job in case the problem has been solved.

heck the Printhead alignment status. If the status is PENDING, perform the

inthead Alignment (Main Menu/Image Quality Maintenance/Align

Printheads). After alignment reprint the job.

heck the paper advance calibration status. If the status is PENDING,

per

form the paper advance calibration (Main Menu/Image Quality Maintenance/Paper Advance Calibration/Calibrate Paper Advance). After calibration reprint the job.

se Part 3 of the Image Quality Diagnostic Print, check if there are a

gnificant amount of nozzles out in the color that is actually c aus i ng the problem (if see yo u a problem w ith the Black color in the cus tomer print , then only check the Black printhead in the Image Quality Diagnostic Print). If there is a significant amount of nozzles out then replace the defective Printhead.

HP Designjet T Series — Service Manual 1-26

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