HP Indigo 7800 Front-to-Back FTB Troubleshooting
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- HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 1
Purpose To describe how to troubleshoot front-to-back (FTB) issues. Scope HP Indigo 7000 Digital Press, HP Indigo 7500 Digital Press, HP Indigo 7600 Digital Press, HP Indigo 7800 Digital Press, HP Indigo 7900 Digital Press, HP Indigo 7r Digital Press With press software version 8.6.3 or later - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 2
contents 1 Overview ...1 Overview Procedure...1 Specifications ...1 Special jigs and tools ...1 Initial belts...8 Troubleshooting the FTB instability between pages...9 Troubleshooting the one arm skew...10 Troubleshooting the duplex ...19 Printing instructions...19 Confidentiality notice...20 ii - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 3
troubleshoot front-to-back (FTB) issues 1. Before starting a. Using the paper handling transparency jig (CA390-03560), verify that the substrate is cut accurately. Instruct duplex issue? b. Perform and validate the press baseline per issue. 3. Troubleshooting a. If the issue appears in both simplex - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 4
0.5mm jig (CA040-81980) Sonic tensionmeter (MHM-007-00) Duplex conveyor and impression gap jig (CA045-16490) Duplex alignment jigs (CA397-06160) 2 Chapter 1 Overview - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 5
Initial software check If you have an FTB problem in a multi-substrate job (a job using different sizes of substrates): For SW V11.2 Request Image Placement Plug-in 11.2 from the WWTS Software PM (Front-to-Back (FTB) Troubleshooting ) For DFE V5.1 I-Fix 1, request discrete fix DF103 from the WWTS - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 6
If the simplex-duplex alignment wizard does not consistently correct the alignment, contact the regional technical group. Diagnostic workflows Refer to the flowchart for diagnostic workflow below. Basic workflow The blue boxes are linked to other sections in this document. Simplex workflow The blue - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 7
Duplex workflow The blue boxes are linked to other sections in this document. Duplex workflow 5 - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 8
6 Chapter 1 Overview - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 9
procedure on how to troubleshoot front-to-back ( run the Encoder Calibration wizard. 6. Print a few sheets to check that the problem was resolved. If not, go to the next Print Care Center. Tap the Home tab. At the picture of the press, tap the Front Cover. The Engine screen appears. Tap the Duplex - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 10
continue accordingly. Adjusting the tension of the perfector belts Follow these steps for adjusting the tension of the perfector belts. 1. Remove the perfector from the press. 8 Chapter 2 Procedures - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 11
the other belt. 7. Reinstall the perfector in the press. NOTE: The tension may loosen after a few days. You may have to repeat this section in a few days. Troubleshooting the FTB instability between pages Follow these steps for troubleshooting the FTB instability between pages. 1. Define 3 cleaner - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 12
4. Put all of the sheets together. 5. Look for vertical shifts after the cleaner pages. For example, in the picture below, after the print cleaner pages, the image on the duplex side becomes unstable Troubleshooting the one arm skew Follow these steps for troubleshooting the one arm skew. 1. Make - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 13
the duplex skew Follow these steps for troubleshooting the duplex skew. 1. Verify that the duplex conveyor belts to GT type Belts that are marked as GT3 have a potential to cause FTB instability problems. Inspect the perfector belts type. If the belts are type GT3, replace them with new GT - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 14
2. Perfector belts - GT3 Type Troubleshooting perfector homing errors To understand the root cause of a perfector homing error, do the following: 1. Click the Start button and from the list of software, selecting hp indigo press > Tools > Show Consoles. 12 Chapter 2 Procedures - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 15
revolution. 4. Click Print Care Center and change the Service level to Customer Engineer and use the daily CE code. 5. Click Bypasses and in the Substrate Transport tab, bypass the Duplex Conveyor. 6. Leave the duplex conveyor open to view its activity. Troubleshooting perfector homing errors 13 - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 16
with W132 (B) - power. b. Swap cable W133 (A) with W131 (B) - encoder. 11. Repeat the PCN terminal commands from step 8 above. If the same arm fails, this indicates a problem at the DSC driver on the board. If the same arm does not fail, this indicates a motor or cable issue. If both arms fail, this - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 17
) graphical specs on HP Indigo 7000 Series Digital Presses. Procedure: Follow these steps for Image placement accuracy. 1. Print 12 sheets of a/the CATP mark on the third (reference) sheet. 3. If the FTF is not in spec, refer to the relevant troubleshooting section in this document. Opposite sides - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 18
4 Appendix - Image placement accuracy specs It explains the Appendix - Image placement accuracy specs. Same side stability (FTF - simplex) It explains same side stability. 16 Chapter 4 Appendix - Image placement accuracy specs - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 19
the position of every registration mark matches that of the corresponding mark on the third (reference) sheet, or is within a 0.2mm radius (0.4mm diameter) area around it. Printed CATP job sheet (4, 5,.., 12) Ø 0.4mm NOTES · Required substrate: 135 gsm max paper (464 x 320 mm) · This contains FTB - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 20
area around the crop/registration marks on the front side of the sheet. Corresponding registration marks Close-up view of corresponding registration marks position Printed CATP job sheet - front side Printed CATP job sheet - back side NOTES · Required substrate: 135 gsm max paper (464 x 320 mm - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 21
HP Indigo 7900 Digital Press to scope CA393-03380 Rev 06 Added Troubleshooting Perfector Homing Errors Responsible Engineer (TS) Press Goldberg / Chaim Mateh Printing instructions Follow these recommendations to achieve the best print quality. Paper weight Page size Printing Simplex/duplex Color - HP Indigo 7800 | Front-to-Back FTB Troubleshooting - Page 22
be copied, reproduced or distributed in any form or medium, or disclosed to any third party in any manner, without prior written authorization of HP. The copyright notice, which appears in this document, is purely precautionary and shall not be deemed to constitute publication or intent to publish
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Front-to-Back (FTB) Troubleshooting
Document details
Purpose
To describe how to troubleshoot front-to-back (FTB) issues.
Scope
HP Indigo 7000 Digital Press, HP Indigo 7500 Digital Press, HP Indigo 7600 Digital Press, HP
Indigo 7800 Digital Press, HP Indigo 7900 Digital Press, HP Indigo 7r Digital Press
With press software version 8.6.3 or later
Document number
CA393-03380
Revision number
Rev 06
Date
20 February 2020
Security level
HP Confidential
The information contained in this document is accurate at the date of release.
Check Knowledge Zone on PrintOS for the most recent version of this document.
The procedures contained in this document can be performed only by HP-Certified CEs or explicitly authorized
operators.
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