HP Indigo 7800 Blanket Creep Troubleshooting

HP Indigo 7800 Manual

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  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 1
    details Purpose To describe how to troubleshoot blanket creep. 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. Document number CA393-09970 Revision number
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 2
    ...3 Identifying blanket creep...3 No blanket creep found...3 Blanket creep found...3 Validating press level ...4 Checking if the blanket itself is the source...5 Checking if first and confidentiality notice...13 Revision history...13 Printing instructions...13 Confidentiality notice...13 ii
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 3
    1 Overview This document describes how to troubleshoot blanket creep issues. Diagnosis of the causes of this issue requires identification of the drum pair that is responsible for the creep. To determine the source of the blanket creep, perform all the instructions in this document. Special jigs and
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 4
    2 Diagnostics workflow Flowchart for diagnostic workflow. 2 Chapter 2 Diagnostics workflow
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 5
    Procedures Follow below to troubleshoot blanket creep. Identifying blanket and 483 mm length). This job has an image that fills the entire sheet (full format).. 3. Check the prints for missing sections on either the instructions in this document. Blanket creep found Continue with the procedures below
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 6
    as described in CA393-08581 Installation Manual for the HP Indigo 7800 Digital Press. 2. Return to "Identifying blanket creep on page 3" on page 5 and continue from there. If there is no more blanket creep, the issue is resolved. Do not continue with the instructions in this document. If there is
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 7
    first transfer. The blanket deformation is checked in three phases: before press operation, after cold start, and after pause mode. Cold start the below steps for cold start test. 1. Remove the blanket. 2. Remove the impression paper and do not install a new one. 3. Cool the ITM to 29 °C or less
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 8
    2 Blanket 3 Anti-seam 4 Gap1 5 Gap2 7. Note the measured values of the front and rear. These are the Before cold start values. 8. At the press UI, touch the Print Care icon > Bypasses and bypass the following:: ● Auto first transfer calibration (in the ILS tab). ● Auto Bias (under Processes
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 9
    press to Idle. 2. Print one page of a simplex job and pause the press so that the press is idle. 3. Wait 13 minutes, after which the press stops. 4. After the press After 13 minute pause values.. 6. After the test, install impression paper and change all the above bypasses to what they were before.
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 10
    following steps disable first transfer influence on blanket creep in order to diagnose if the blanket creep issue is from the second transfer. 1. Change the press to Standby. 2. Replace the blanket. Measure the distance between the edge of the blanket and the edge of the drum (as shown in step 6 of
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 11
    a. From the Select Stepper Motor dropdown list, select: ALL_PIP_ENGAGE b. From the Select an Operation dropdown list, select SDV_OPC_ ENGAGE c. From the Select a Segment Index dropdown list, select 0 (zero). d. Click OK. The mmi_Stepper window reappears. 10. In the mmi_Stepper window, do the
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 12
    e. In the Profile Parameters pane, change the Steps to Move (Half Step) field value to 980. f. At the menu bar, click File > Generate Profile > Save SysTab. 11. Print 1000 impressions with the Blanket creep job, starting with a hot ITM drum (105 °C). 12. Measure the distance between the edge of the
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 13
    Refer to CA393-05670 ITM Bearings Replacement. PIP bearings are the source of the blanket creep Disassemble and then reassemble the PIP bearings. If the problem is not resolved, replace the PIP bearings. Refer to CA393-00050 ITM and PIP Drum Removal. ITM bearings are the source of the blanket creep
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 14
    they have freedom of movement, as shown below (click the picture to view the video): If the new PIP bearings do not have freedom of movement, do not use then reassemble the impression bearings. If the problem is not resolved, replace the impression bearings. Refer to CA393-04641 - Impression
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 15
    the error. Responsible Engineer (TS) Press Group Manager DFE Group Manager Engineering instructions Follow these recommendations to achieve the best print quality. Paper weight Page size Printing Simplex/duplex Color Finishing 80 g A4, Letter, or 8.27 x 11.00 in (21 x 27.94 cm) Office printer
  • HP Indigo 7800 | Blanket Creep Troubleshooting - Page 16
    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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Blanket Creep Troubleshooting
Document details
Purpose
To describe how to troubleshoot blanket creep.
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.
Document number
CA393-09970
Revision number
01
Date
11 January 2017
Security level
HP Confidential
The information contained in this document is accurate at the date of release.
Check CE Suitcase for the most recent version of this document.
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