5 Print Quality
Contents
1. 5 Print Quality on h E 5 O E c a e Initial Print Quality Troubleshooting Actions cccccccccccesseeeeeeeeeeeaeeeeeeeeeesseeseeeseeasaeeeeeeeees 228 e How to Use the Image Quality Plots rrrrnrrrrrrrnnnnnnrrrerrrrnnnnerrrrrrrnnnnesrrrerrnnnnnssersennn 228 e 2 2 Printhead Alignment Test Plot wsic cicescie eecccdetenssavencessmetesaeiceersduedes enste 229 e 241 Printheads Health Test PO s ccadcssnenreessinecnonsdesascren Lana fe ebaaesasiedmoaasniess 231 e 232 Substrate Advance Test Plot Lunner badareeseen 233 e 2 4 2 Advanced Printhead Health Test Plot ccccccsseccccesseeecceeseeeeeeseseeeeeeesseeeeeeeaas 235 EN Ploi for escalation Ned 239 JE NO SEEREN T 239 SI NKS ON Subsirate Tes eieiei rie enne rari E E AEAEE EEE 240 e Dn 200 EEE EE sc rseeeendenln 241 s Fore Drop Dalei oN RE RE EE E EN 242 e Substrate advance SSUES REE 243 227 Initial Print Quality Troubleshooting Actions For the vast majority of print quality problems a Call Agent should request that the customer pertorms the troubleshooting actions in the Maintenance and Troubleshooting Guide in the section Troubleshooting print quality issues Most problems can be resolved using these procedures without the need for an on site visit a E O D c D A How to Use the Image Quality Plots The Printer contains a series of basic image quality tests which help you to diagnose image quality defects There is a2. transparent translucent e Try cleaning the Printheads if the error continues e If the error persists replace the affected printhead e If there is an issue in the ThetaZ and it cannot be fixed check if the paper is working with the OMAS sensor There are some papers that cannot be controlled by the OMAS sensor If the paper is a type that should work with the OMAS sensor check the functionality of the sensor 238 Chapter 5 Print Quality 2 4 3 Plot for escalation only To print this test plot go to Menu List gt 2 Image Quality Plots gt 2 4 Printheads Health gt 2 4 3 Only For Escalations There are two identical plots to this test and each plot has three parts to it The first plot refers to the rear printheads number 1 3 5 while the second plot refers to the front printheads 2 4 6 DERSE ERSS IL Shi er en inp Aa imi imi lis vii z a Bii mine Luise ind ant fans i i i en ir ie ii ra ol EN ie 2 de ina ie ET eee H ee HL i i This plot is only printed at the request of the HP Division or in case further help is required and there is need to escalate an image quality issue to HP Division 2 5 Geometry Check The Geometry check print test is a simple template designed to check the printer s length accuracy and figure distortion performance To print this test plot go to Menu List gt 2 Image Quality Plots gt 2 5 Geometry Check If a customer complains that there
3. paper S the media is the media Yr the list of non the list of non OMAS navigable edia NO NO Acceptable Visua Paper Advance Plo Pertorm the Paper Advance Calibration Refer to chapter 4 Replace the OMAS OMAS Blinking CLOSE a It could be a s the Issue limitation of the fixed customer s xeplace the paper OMAS CLOSE 244 Chapter 5 Print Quality Ayjond utd 245 Dm E O E c 2 A 246 Chapter 5 Print Quality
4. easier to iden tity exactly the areas of the plot where the measurements were taken al 5 O sje A ao NOTE To check if a printer complies with the technical specifications please refer to Line Es accuracy section in the printer s data sheet NOTE After loading media allow the media to stabilize before printing the plot Some types of media require up to 3 meters before it is stabilized Corrective Action Reload the media following the exact steps from the User s Manual 2 In some cases differences in the media advance along the scan axis could cause geometric defects Try adjusting the settings in the RIP Adjust Vacuum level and Backtension levels Be careful when adjusting these settings refer to the RIP supporting documentation for further details of this type of adjustment 3 1 Inks on Substrate Test The Inks on Substrate Test plot is used to determine the level of performance of the Drying and Curing Assemblies and to determine if they are performing as expected To print this test plot go to Menu List gt 3 Inks On Substrate Test gt 3 1 Print Ink Test Plot At the beginning of the plot is an area used to stabilize the printing system before the diagnostic print is printed this area can be ignored The diagnostic area of the print contains colored blocks representing each of the primary and secondary colors the plot shows a scale from lighter to darker intensity amount of ink The plot i
5. using the button on the front panel to change the compensation of the substrate advance as the printer prints It is very important to verify that the substrate selected on the front panel is the same as the actual substrate loaded on the printer You can verify the substrate type selected through the Front Panel Main Menu gt Paper Menu gt View Loaded paper If an incorrect substrate is selected this will produce an offset error in the Paper Advance Corrective Action The figure shown here left shows a vertical lighter shaded line placed at column 3 which indicates an offset of 8 57mm per meter This can be adjusted by using the button on the front panel to change the parameters as the printer prints e If the lighter line is in the negative column increase the compensation of the substrate advance e If the lighter line is in the positive column decrease the compensation of the substrate advance When the lighter shaded line is in position 0 the process is complete If the advance is not a straight line this would indicate that the printer has a variable advance error If this is the case verity the following e Check to see if the OMAS is clean if it is not clean the OMAS and reload the substrate and repeat the diagnostic plot Check that the OMAS is functioning correctly Check the light in the OMAS blinks while the substrate moves while an image is being printed Check that the OMAS can
6. Sensor gt Page424 Perform the TOMAS Sensor Check to check the electrical functionality of the TOMAS gt Page 189 If the TOMAS Sensor fails the check replace the TOMAS Sensor gt Page424 243 Ea h E O seen c a Advance error with the Substrate or with OMAS There is an advance issue a List of types of media which are NOT used non navigable by the OMAS media sensor Replace the HP or HP Approved Clear Film TOMAS HP or HP Approved Backlit Clean OMAS NO gt E 5 O sx c ye A d reload th HP or HP Approved types of Matt film ls en HP or HP Approved types of ED pr Test passed Polypropylene A non HP or HP Approved Media YES b In order to perform this Calibration you Launch the user should order the Paper Advance advance Calibration Kit Part Number Q1273 calibration 60296 which contains two cut sheets of adjustment HP Universal Instant dry Gloss Photo media 36 inches wide by 42 inches long kae dived YES CLOSE OMAS Blinking means that the red LED in the OMAS lens blinks ON OFF during NO paper advance when OMAS is operating Launch the Visual Paper Advance oe using HP Glossy paper provided for the eld Refer to ie P page 233 for the details of DE the calibration Acceptable Viste Paper Advance Plot replace the OMAS YES Launch the Visual Paper Advance Diagnostic using the Customer s
7. Swath 2 reverse gt p Swath 3 forward The plot should show lines perfectly aligned with each other a straight vertical line indicates correct bidirectional alignment A If any of the printheads are experiencing bidirectional misalignment issues the alignment test will print the lines as show below B A B gt gt gt ia gt 3 Nozzle check and Paper Axis Die to Die Registration The colors are printed with a halftone low ink area fill in a one pass printmode Am a The small arrows point to the place where two different printhead dies meet No significant light or dark lines should be seen at this point Manual Alignment reset the alignment back to factory defaults The patches also provide a basic judgment about the printhead nozzle status Horizontal bands indicate weak or missing nozzles 4 NOTE If there are many horizontal bands indicating weak or missing nozzles the die to die Es registration test will be a poor indicator of the status of the die to die registration If this occurs clean the printheads and reprint the test 230 Chapter 5 Print Quality 4 Error reference The plot contains a reference marked Legend this is a guide to deciding if any of the printhead registrations are correct or incorrect The correct incorrect criteria shown here corresponds to a plot with a maximum IQ usually printed on high quality substrate such as vinyl Other substrates and usage may accep
8. age Quality Plot gt 2 6 Scan Axis Check Any defects in the encoder strip will have a detrimental affect on the image quality of the printer specifically in the area where the encoder is defective The defect is revealed by means of an interference or Vernier pattern that spans the whole Scan Axis of the printer Print direction 241 DN E 5 O E c E A The test plot consists of six horizontal color bands with a black pattern mask on top of them Each band is split in to two horizontal areas corresponding to the die O and die 1 for the specific color The plot is printed in unidirectional mode at 40ips Plot evaluation Any encoder strip defect will be directly reflected in the encoder strip check plot A glitch can be seen in the region where the encoder strip is defective The glitch traces are repeated for all colors and printheads die O and die 1 The traces in the plot keep the relative distances in scan axis direction as the printheads are positioned in the carriage al E 5 O E ye A J D N Encoder strip Encoder strip defect Corrective action If an fault is found with the encoder strip replace the Encoder Strip gt page 399 Force Drop Detection If the Printhead Health test plot page 231 has persistent white point banding in only one color that cannot be fixed with a recovery you can use this option to resolve the problem by resetting the nozzle health data
9. base so that all nozzles are assumed to be correct After the nozzle health data base has been reset the drop detection procedure is started gt page 192 The normal cause of this white point banding in a single color is the failure of the drop detector to correctly detect nozzles pot on the printhead This tool is also helpful to diagnose a potential failure of the drop detector The force drop detector tool displays the number of nozzles out per printhead If you print the diagnostic plot image afterwards you will be able to compare this number detected by the drop detector with the real number of nozzles out that you see on the printout If there is a mismatch on all the colors this would probably indicate that the drop detector is not working correctly or is mispositioned Before replacing the drop detector perform a drop detector calibration gt page 216 to correctly position it If the failure miss match is still there after the calibration replace the drop detector 242 Chapter 5 Print Quality Substrate advance issues The vast majority of issues concerning the advancement of the substrate can be solved by asking the customer to clean the Substrate advance sensor window This procedure is described in the customer document Maintenance and Troubleshooting Guide If after performing this the customer is still experiencing image quality issues related to the advancement of the media use the following pro
10. cedure 1 Make sure the window of the OMAS sensor located in the Platen has been completely cleaned of all ink the cleaning swabs provided to perform this procedure must be used Some types of substrate cannot be used with the OMAS sensor because they are too smooth or there is too much light reflected from the substrate surtace to be able to be read by the OMAS examples of these types of substrate are Clear Film Backlit types of Matte film types of Polypropy lene Check the troubleshooting procedure on the next page to determine if the error is with the OMAS or the Substrate being used If the error is with the substrate there are two options e Change the type of substrate to a type that can be used with the OMAS ideally it will be a substrate with a readable surtace such as a self adhesive media the type with a removal back Ing e Disable the OMAS and use the analog device to control the substrate advancement To disable OMAS go to Service Test Menu gt 1 3 Media Path Menu gt 1 3 3 Enable Dis able OMAS Refer Page 189 Perform the Substrate Advance Calibration select the ink icon on the Front Panel and then select Image quality maintenance gt Substrate Advance calibration gt Print adjust ment plot refer to the Maintenance and Troubleshooting guide Perform the OMAS Sensor Check to check the electrical functionality of the OMAS gt Page 189 If the OMAS Sensor fails the check replace the OMAS
11. er types are not suit able for the Printhead Alignment 2 4 1 Printheads Health Test Plot To print this test plot go to Menu List gt 2 Image Quality Plots gt 2 4 Printheads Health gt 2 4 1 Print Test Plot The printhead health test plot is designed to enable you to see the overall health of the printhead nozzles The nozzles check bottom of the plot is printed in a one pass full swath mode The diagnostics test prints out every single nozzle of each Printhead without applying an error hiding or alignment algorithm 23 For each Printhead you can see both the adjacent and the consecutive nozzles For every Printhead there is a different horizontal band that can be identified with the help of the template marked with the colors of the Printhead used at the right of every band a 5 O sje z ye A E a en pm Gr d HONYE There are a series of numbered stepped diagonal lines If one or more of the nozzles are malfunctioning or mis positioned you will see that the stepped lines are broken or misdirected in one or more places In this example of the plot the print shows a nozzles health pattern without any failing nozzles In this case the case shown corresponds to the black color This is an example of nozzles outs You can see the broken or the skewed line in this case marked in yellow to help you to understand the issue In the service plot there are no yellow marks This is an example of nozzles mis
12. ere are any advancement issues they will appear in this diagnostic plot The plot can be used to precisely measure the media advance error with a one dot row accuracy or 2 85mm per meter and to verify the stability of the media advance In addition the test is performed on the left center and right side of the scan axis This is to verify any differential advance due to an uneven advancement of the substrate Each sample is composed of 9 vertical columns named 4 to 4 Each single column represents an advance deviation of 2 85mm per meter so column 4 is related to a deviation of 11 42mm per meter and 4 corresponds to 11 42mm per meter The advance obtained along the scan axis direction corresponds with the position of the lighter portion of the pattern in each advance as shown on the next page 233 gt hj E O se c ye A I I I i I i l i I i l F i a i 1 F i F i 1 i i EE ee ee Ed en Pr ala Fan ee fa a me ee eee ee oe r M T i i i Media Advance Diagnostic Plot by IQCA group Passes 6 dr 2 dr of EE EE dr 1 I A perfectly calibrated printer will show a straight vertical lighter line in the O column If the lighter line is printed in any of the other columns this would indicated there is a constant advance offset along the entire plot If the offset is bigger than 2 95mm per meter the lighter column is not the center one this can be adjusted by
13. function correctly with the type of substrate loaded If is cannot for example with high gloss substrate disable the OMAS from the RIP and reprint the diagnostic plot om pp Be 2 234 Chapter 5 Print Quality 2 4 2 Advanced Printhead Health Test Plot S siam The Advanced Printhead Health Test Plot is not part of the large diagnostic print but it is similar to the 5 Printhead Health Test Plot described previously With this plot however you will be able to identify which of the Printhead Nozzles is actually failing To print this test plot go to Menu List gt 2 Image Quality O Plots gt 2 4 Printheads Health gt 2 4 2 Advanced Test Plot T lt p ee Ug gis Jag This plot like the normal nozzles health test prints in a special one pass full swath mode but unlike the normal nozzle health test only a few of the nozzles are printed at once and with small incremental media advances Eventually all the nozzles of all the printheads are printed this means printing the plot can take longer than the normal heath test The plot is intended for visual inspection only The plot consists of three blocks For each printhead there is a different block which can be easily identified by the colors of the printhead used inside and or the template located on the right side Each block is split horizontally into two areas that correspond to the colors in the printhead Vertically the block is split into sections that correspond to two dies co
14. is an issue with a plot they are printing this standard template can be printed and referred to by both the customer and HP as a single point of reference The plot consists of a 7x7 matrix of rectangular boxes By default each single rectangle corresponds to a DIN A4 sheet size 210mm x 297 Based on this the total printed plot length should be about 2 07 meter approx 82 and 1 47 meters approx 58 However the actual dimensions will highly depend on what settings have been defined for the Media Advance Each point in the matrix can be identified by means of a letter in the X axis and number in the Y axis There is an arrow in the plot close to the point Al to show the printing direction The method of evaluating the geometric performance is the following Select an area on the matrix to evaluate for accuracy and dimensional integrity The template is designed so you can measure anything from an A4 sheet upwards to any probable dimension 2 Place the printed plot on a flat surface This will minimize any wrinkles before proceeding with the process 239 DN h E O seen c A 3 Find the vector length accuracy by selecting parallel vectors and or figure distortion by measuring the diagonals in the selected area 4 Note the measurements to access the printer s performance It will help to keep the measured vectors identified by using the name convention marked on the plot i e Al A3 This makes it
15. mbining the two staggered printhead of each color see graphic below EE f Uman e Printhead 4 die 1 GO 5 Printhead 5 die 2 Valg Light Magenta color Magenta color Template 235 Each single region is composed of a series of numbered triangles Each rectangle is related to a single nozzle in the printhead If one or more of the nozzles are malfunctioning or mispositioned you will see that the rectangles are not filled The corresponding color and the number printed inside can be read m i i Ai i i aa auiii Ge af af ts aban ae pt i i i i I i I i i i a k E O sen 2 A 258 i i i toi o sE JIN 3 DU INE HUN THE F Erg GAGE 4 i t a IN bi 4 3334 i ag Dee 1778 2970 ae o G UN pu yy pa NB Ch Lett EEE E ud BR ble mite GI MA VIE SB Eh OG VEG 4 f 1 PE 7 7 i i OM This example on the left has many 1 28 H D nozzle outs The unfilled white 2 986 rectangles indicate the nozzle is not 34 0 firing In this example the zoomed H H VES 09 SS area has 6 faulty nozzles The 1424 WIE 1418 2830 109 7 SH 21450 3008 UN Hee UH H a rer Odie 25350253 SE EA 0 1884 1 corresponding nozzle number canbe i 0 i ie Er vrir tet 00 seen directly from the print ate 1518 TEE 1038 JAE va vas dfi 4920 AG Ce e S EE i a di Hie This is an example of good nozzle health All rectangles are pertectly filled with the printhead s color Corrective acti
16. n option to print all three diagnostic prints at once or print them individually The three Image Quality plots test the printer in different ways but can be split into the following sections Printhead Alignment The purpose of this test is to test the accuracy of the current printhead alignment Printheads Health This test is designed to check if the printhead nozzles print correctly Substrate Advance This test enables you to visually check if there are any substrate advance issues with the printer To print all the test diagnostic prints shown here go to the Service Menu List gt 2 Image Quality Plots gt 2 1 Print ALL plots Considerations for Printing the Diagnostic Print 1 Use the same type of paper that the customer was using when they experienced the image quality problem 2 If you do not see any problems with the Image Quality Test then the problem may not be with the printer itself The problem may be with the RIP lb B b d tb 246 F Substrate Advance Pgb Bgls ndp ae ae Bydp gen Printheads Health i Ensa Printheads 228 Chapter 5 Print Quality 2 2 1 Printhead Alignment Test Plot To print this test plot go to Menu List gt 2 Image Quality Plots gt 2 2 PH Alignment Menu gt 2 2 1 Test Plot This test is designed to check the accuracy of the current printhead alignment The plot consists of five different areas 2 Scan Axis Bidirectional 1 Scan Axi
17. on If the printer has nozzle defects the level of image quality achieved can still be considered acceptable because the Printer can automatically compensate for this there is no need to replace the Printhead because of nozzles out A single die for a single color can contain up to 70 nozzles out and still the print quality will not be signiticant degraded Perform a clean of the printheads 2 If there is still any die above the threshold level 70 nozzles out perform a hard clean process 3 If the a hard clean has improved the number of nozzle that have been recovered perform the hard clean again 4 If there are any dies that have more than 70 nozzles out per die replace the printhead 236 Chapter 5 Print Quality 2 2 2 Advanced Alignment Diagnostic Print This plot helps you to visually check any alignment problems of the printer it is similar to the process already described on gt Page229 but in more detail You use it to precisely measure the alignment error with a one dot row accuracy To print this test plot go to Menu List gt 2 Image Quality Plots gt 2 2 PH Alignment Menu gt 2 2 2 Advanced Test Plot The plot is split into two main areas The area upper area contains the area which checks the pen alignment while the bottom area checks the same color staggered pen overlap Nt p Lower area Pen alignment diagnostics Pen Alignment Diagnostics The Pen alignment Diagnostics shown in the red box abo
18. pattern is related to the rear printhead furthest from the user when doing the pen replacement un The area to check is the junction marked with a of the black with the rest of colors 4 The alignment in the scan axis direction between both printheads of the same color is marked as 4a in forward direction die2dieSAD Fwd and 4b in reverser direction die2dieSAD Rev un The area to check is the junction marked with a The lines have to be continuous 5 The ThetaZ of the printhead are checked in the area marked as 5 It checks in forward Tz Fwd and reverse direction Tz Rev The area to check is the junction marked with a The lines have to be continuous 6 The area marked as number 6 is a reference legend that shows junction misalignments of 2 4 and 6 dots The junction to check has to be below 4 in all the cases If the error seems to be above 4 dots then realign the printheads again Die Overlap Alignment The Die Overlap alignment is at the bottom of the plot The area to check is only the bottom junction pattern for all the colors The clearest band must be around the O 3 dots Every band is equal to a one dot error Corrective action In order to solve any problem in the alignment pertorm the following e Repeat the printhead alignment Most recommended papers are glossy papers were pen alignment accuracy is best There are some paper types that are not suitable for Printhead Alignment
19. positioned or malfunctioning You can see the broken or the skewed line in this case marked in yellow to help you to understand the issue In the service plot there are no yellow marks For a more in depth view of the health of the nozzles you can print the Advance Nozzles Health test plot Corrective Action If the printer has nozzle defects acceptable print quality results can still be achieved because the Printer can automatically compensate for this there is no need to replace the Printhead because of nozzles out The method of improving Nozzle Defects is to To clean the printheads go to the pane front panel and select the ink menu then Image serie maintenance gt Clean printheads Select which printheads you need to clean You can clean all o the printheads or only some of them The selections available are Clean all e Clean M LM e Clean C LC e Clean KY 2 Reprint the Printhead Nozzles Test Plot to verify that the defective nozzles have been corrected 3 If the problem persists replace the defective Printhead 232 Chapter 5 Print Quality 2 3 2 Substrate Advance Test Plot Printing direction paper axis a h E 5 O a c a Left plot Center plot Rig hi plot To print this test plot go to Menu List gt 2 Image Quality Plots gt 2 3 Substrate Advance gt 2 3 2 Print Adjustment Plot The Substrate Advance Test Plot enables you to visually determine the accuracy of the media advance if th
20. s and Poper Axis Printheod registration a Nozzle check ane i HE AxisDietoDie registration ltd T F 5 Soon Axis 4 Error Angular Check Reference 1 Scan Axis and Paper Axis Printhead registration The colored crosses of the plot should show lines perfectly aligned with each other as shown below The die 1 and die 2 of the black printhead is used as a reference to which the rest of the pens are compared The substrate does not move while the pattern is being printed SCAN AXIS AND PAPER AXIS PRINTHEAD REGISTRATION DIE 1 pp SCAN AXIS AND PAPER AXIS PRINTHEAD REGISTRATION DIE 2 a aww Ole If the Printer is experiencing horizontal misalignment problems the Alignment Test will print the lines in the orientation shown below A If the Printer is experiencing vertical misalignment problems the Alignment Test will print the lines in the orientation shown below B A 229 DN E O E c E A 2 Scan Axis Bidirectional check al The small arrows point to the place where lines printed in forward and reverse directions meet It is at this 5 point that the registration accuracy must be checked The check should be done for the M Lm KY and C Lc printheads The bidirectional alignment can change lt slightly as the substrate thickness varies a Swath 1 forward NT a Swath 1 reverse p gt Swath 2 forward lt q
21. s printed with a 10 pass print mode Inked stabilization area Primary Secondary colours ee Lightest Darkest A Lightest Darkest squares squares squares squares 240 Chapter 5 Print Quality To evaluate the Drying test plot look at the last square in order of increasing ink quantity that shows no coalescence banding or bleed effects Some ink excess Significant ink excess Too much ink has caused the inks to bleed into each other To evaluate the Curing test plot look at the squares that show ink smudge when touched see picture or that show an oily finish which is more likely The following table shows the maximum quantity of ink the darkest patch that can be printed using HP Permanent Gloss Adhesive Vinyl without producing any of the issues previously stated The evaluation is performed in the secondary colors only Color Coalescence Bleed Curing defects a OT G 100 EA 100 100 116 200 Corrective Action At the bottom of edge of each block of primary color and at the top of each secondary color there is a percentage scale which indicates the level of ink used to print that portion of the diagnostic print This information can be used to adjust the ink saturation levels in the RIP used by the customer 2 6 Scan Axis check This plot shows any defect in the Encoder Strip along the Scan Axis To print this test plot go to Menu List gt 2 Im
22. t significantly worse registrations while stilling producing an acceptable level of image quality Ea h E O seen c a e Automatic printhead alignment may not produce optimal registration under certain conditions Substrate texturing elasticity and the behavior of the substrate under different temperatures may lead to some imperfections with regards to printhead registration In these circumstances the user may choose to use the Manual Printhead Alignment instead Correct Incorrect SS ee 0 um 42 um 84 um 126 um Printhead Alignment Errors legend lt 65um 5 Scan Axis Angular Check The small arrow point to the place where the lines printed in subsequent passes meet using unidirectional printmode The registration must be checked at that point The check should be done for the MLm KY and Clc printheads Note that the substrate advances between the upper and lower parts of the plot This test mainly relies on the changing surface of the substrate Problems in the angular alignment lead to pen to pen misregistration This is because of the staggered orientation of the printheads The angular alignment can differ slightly when the type of substrate varies or when the substrate has recently been loaded i Swath 2 Corrective Action Perform a Printhead Alignment Use the same type of paper that the customer was using when there were image quality printing issues However it should be noted that some pap
23. ve consists of various areas to check the alignment Auto Pen Alignment APA Diagnostic Plot for Calico O 5 0 dots 2 dots 4 dots 6 dots Error legend dots printing res Tz Rev Pen2Pen Fwd mi die2dieSAD R v Die2DiePAD Pen2Pen Rev PAD Pen2Pen Rev 237 DN h E O fen c a In this area there are four checks for the pen to pen alignment in the scan axis direction Pen2Pen Fwd or Pen2Pen Rev It is forward and reverse e The top pattern is related to the front printhead nearest to the user when doing the pen replacement e The bottom pattern is related to the rear printhead furthest from the user when doing the pen replacement sm E O x D A un The area to check is the junction marked with a of the black with the rest of colors 2 The bidirectional check is at the top marked as Bidir a The top pattern is related to the front printhead nearest to the user when doing the pen replacement b The bottom pattern is related to the rear printhead furthest from the user when doing the pen replacement un Check that the lines are continuous without a gap The junction is marked with a 3 The pen to pen alignment in paper advance direction PAD is marked as number 3 a The top pattern is related to the front printhead nearest to the user when doing the pen replacement b The bottom
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