HP Indigo 7800 Troubleshooting airflow pressure switches -- CA393-09630 Rev 01
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- HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 1
Purpose Scope Document number Revision number Date Security level To describe how to troubleshoot the airflow pressure switches for the EBV/ITM blowers. HP Indigo 7800 Digital Press CA393-09630 01 30 December 2015 HP Confidential The information contained in this document is accurate at the date - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 2
Table of contents 1 Overview ...1 Background...1 System Description...1 Parts list ...2 2 Troubleshooting ...5 Air flow blockages ...5 Preliminary troubleshooting ...6 Error Messages...6 Testing the air flow pressure switches...7 Appendix A Electrical circuit for switches ...9 Electrical circuit and - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 3
1 Overview This document describes how to troubleshoot the air flow measuring system on the HP Indigo 7800 Digital Press. Background The new air flow measuring system is designed to identify problems in the air flow path and problems with the ITM and EBV blowers. System Description The ITM and EBV - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 4
with an Vacuum is too strong. or vacuum is not strong acceptable vacuum acceptable vacuum Indication of a blockage in enough the air path The problems may be caused by one or more of the following: ● Air flow blockages ● Incorrect installation of the EBV suction modifications kit ● Incorrect - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 5
CA345-53550- Pressure Switch Top Assy Figure 1-3 Pressure Switch Assy Kit contents 0960-3352 - 150 Pa pressure switch (2 units) 0960-3496 - 650 Pa pressure switch (1 unit) 0960-3564 - 4200 Pa pressure switch (1 unit) Figure 1-4 150 Pa pressure switch (see circle- the pressure value is printed on the - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 6
Figure 1-5 4200 Pa pressure switch (with additional electrical pin. The 650 Pa switch looks the same. Verify the pressure by looking at the printed value.) 4 Chapter 1 Overview - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 7
2 Troubleshooting Troubleshoot the air flow measuring system on the HP Indigo 7800 Digital Press Air paper blocking the suction holes. If there are pieces of paper stuck in the air holes, remove them and verify that this solves the problem. Open the ITM suction cover and check for pieces of paper - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 8
Preliminary troubleshooting The following tests should be performed before any of the other procedures below. These tests identify the most common causes of problems with Air Flow Switch Installation Instructions). Error Messages List of errors and its possible solution. 6 Chapter 2 Troubleshooting - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 9
. A piece of substrate may be caught in the air suction path. If the above error message appears, perform the preliminary troubleshooting above. If you cannot solve the problem by performing the preliminary tests, do the following: ■ Disconnect the electrical connectors from the 2 legs of the 150 Pa - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 10
switches. Measure the resistance of each switch. Without the air tube attached, the switch should be closed. If it is not, replace the switch. 8 Chapter 2 Troubleshooting - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 11
A Electrical circuit for switches Electrical circuit diagram for switches. Electrical circuit and Wiring Diagram The following is the electrical circuit for the pressure switches. Figure A-1 Switch circuit The following is the wiring block diagram for the pressure switches. Figure A-2 Wiring block - HP Indigo 7800 | Troubleshooting airflow pressure switches -- CA393-09630 Rev 01 - Page 12
table of revisions, printing instructions, and a notice of document Initial document Responsible Engineer (TS) Press Group Manager R&D Engineer Engineering document contains valuable trade secrets and confidential information of HP. Nothing herein may be copied, reproduced or distributed
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Troubleshooting airflow pressure switches
Document details
Purpose
To describe how to troubleshoot the airflow pressure switches for the EBV/ITM blowers.
Scope
HP Indigo 7800 Digital Press
Document number
CA393-09630
Revision number
01
Date
30 December 2015
Security level
HP Confidential
The information contained in this document is accurate at the date of release.
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