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HP Latex 600/820/850, HP Designjet L65500, HP Scitex Lx800 Industrial Printer - Troubleshooting 'No Flow While Attempting to Fill Intermediate Tank'

This document is for HP Latex 600/820/850, HP Designjet L65500, and HP Scitex Lx800 Industrial Printers.

There is no ink flow while attempting to refill the intermediate tank

The Latex and LX series of printers use an intermediate tank system to supply ink to the printheads. Ink from the primary ink supply (the external ink cartridge) flows to the intermediate tank, which is then pressurized by air. The air pressure acting on the intermediate tank causes the ink to move through the Tube Routing System (TRS) in the cable carrier to the carriage, where it replenishes the printheads. The error message 24.x:12.1 - There is no ink flow while attempting to refill the intermediate tank, where "x" is replaced by a number from 1 to 6, indicates that ink was not detected as moving through the Ink System Module (ISM - the end of the printer opposite from the front panel) during a time when it was expected. All movement of ink is sensed by changes in the liquid ink pressure (separate from the air pressure mentioned above).
  • 24.1:12.1 Black
  • 24.2:12.1 Yellow
  • 24.3:12.1 Cyan
  • 24.4:12.1 Magenta
  • 24.5:12.1 Light Magenta
  • 24.6:12.1 Light Cyan
  caution:
The following procedures involve enabling Diagnostic Mode on the printer. Diagnostic Mode is a special mode that enables menu options specific to troubleshooting and service. Readers of this document and printer operators are strongly cautioned not to attempt to use any Diagnostic menu items that are not specifically recommended by HP and/or that are not fully understood by the person operating the front panel. When any recommended use of Diagnostic mode is completed, restart the printer to exit Diagnostic mode and resume normal operation mode.

Main Ink Electrovalve (entry electrovalve) did not open

There is one entry electrovalve for each color. The electrovalve is normally closed, preventing ink from flowing into the system from the external ink cartridge. The electrovalve may become stuck closed. In many instances the valve can be freed and restored to normal operation.
note:
An assistant is recommended to make the test easier.
  1. Using a Torx T30 driver, remove the ink system module (ISM) enclosure panels.
    note:
    It may be necessary to remove only one panel, depending on the color indicated by the error code. Removal of the end panel allows easiest access to the electrovalves, but requires removing at least one of the side panels first.
    • Input-side or back ISM enclosure removal. Remove this panel for access to magenta, light magenta, and light cyan components.
        Figure : ISM input-side panel
        Removing the ISM input-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
    • Output-side or front ISM enclosure removal. Remove this panel for access to black, cyan, and yellow components.
        Figure : ISM output-side panel
        Removing the ISM output-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
    • ISM end panel enclosure removal. Remove this panel for access to all ISM components except for intermediate tanks. At least one of the side panels must be removed for access to the interior fasteners.
        Figure : ISM end panel
        Removing the ISM end panel
      1. Internal Torx T30 fasteners (two locations)
      2. External Torx T30 fasteners (two locations)
      3. Enclosure panel
  2. Locate the electrovalve for the affected color.
      Figure : Entry Electrovalve identified
      Identifying the Entry Electrovalve
    1. Entry electrovalve
    note:
    Some versions of the electrovalve are blue in color rather than black.
  3. Enter Diagnostic Mode.
    1. Press and hold the Cancel button and the Down arrow.
    2. Press and hold the Power button.
    3. Continue to press all three buttons.
      The LED indicator on the front panel will be steady-on red, then steady-on green, and then finally start blinking green.
    4. When the LED begins blinking green, release all three buttons.
      Figure : LX front panel
      LX front panel
    1. Cancel button
    2. Down arrow
    3. Power button
    4. LED
  4. Actuate the electrovalve
    1. With the printer in Diagnostic mode, use the front panel keys to navigate to 4.15.1 Entry Front Valves or 4.15.2 Entry Rear Valves, depending on which color is presenting the original 24.x:12.1 error code.
      The front panel will show the three colors on the selected side.
    2. Use the Up/Down keys to highlight the desired color.
    3. Station an assistant at the electrovalves and instruct him or her to place his or her finger on the electrovalve in question.
    4. With the desired color selected on the front panel, press OK to activate the electrovalve.
      The front panel display will show the open or closed state of the valve.
    5. Use the front panel to open and close the valve several times until the assistant hears a click and/or feels the valve operate.
      When the electrovalve operates normally, there is an audible "click" noise as well as a physical sensation.
    6. If the valve is not detected as operating, have an assistant tap lightly on the electrovalve with the end of a screwdriver or similar tool while continuing to attempt to operate the valve from the front panel.
      The tapping by the tool on the valve may free a stuck valve and allow resumed operation of the printer.
      If the valve is not detected as opening and closing after repeated attempts, it may indicate the valve has failed. The valve may be replaced using HP spare parts.
      • Q6703-67127 Electrovalves Kit
      • Q6702-60686 ISM Repair Kit
  5. Clear the error.
    1. Use the front panel keys to navigate to 4.14 No Flow Error Recovery.
    2. Use the front panel Up/Down arrows to select the desired color, then press OK.
      The printer displays the message OK then automatically restarts.

Integrated check valve (four-way valve) blocked

The four-way valve that directs ink to the appropriate intermediate tank did not open, thereby preventing ink from flowing to the tank.
  1. Using a Torx T30 driver, remove the ink system module (ISM) enclosure panels.
    note:
    It may be necessary to remove only one panel, depending on the color indicated by the error code. Removal of the end panel allows easiest access to the electrovalves, but requires removing at least one of the side panels first.
    • Input-side or back ISM enclosure removal. Remove this panel for access to magenta, light magenta, and light cyan components.
        Figure : ISM input-side panel
        Removing the ISM input-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
    • Output-side or front ISM enclosure removal. Remove this panel for access to black, cyan, and yellow components.
        Figure : ISM output-side panel
        Removing the ISM output-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
    • ISM end panel enclosure removal. Remove this panel for access to all ISM components except for intermediate tanks. At least one of the side panels must be removed for access to the interior fasteners.
        Figure : ISM end panel
        Removing the ISM end panel
      1. Internal Torx T30 fasteners (two locations)
      2. External Torx T30 fasteners (two locations)
      3. Enclosure panel
  2. Locate the four-way valve for the affected color.
      Figure : Four-way valve
      Identifying the four-way valve
    1. Four-way valve
  3. Enter Diagnostic Mode.
    1. Press and hold the Cancel button and the Down arrow.
    2. Press and hold the Power button.
    3. Continue to press all three buttons.
      The LED indicator on the front panel will be steady-on red, then steady-on green, and then finally start blinking green.
    4. When the LED begins blinking green, release all three buttons.
      Figure : LX front panel
      LX front panel
    1. Cancel button
    2. Down arrow
    3. Power button
    4. LED
  4. Actuate the electrovalve
    1. With the printer in Diagnostic mode, use the front panel keys to navigate to 4.15.1 Entry Front Valves or 4.15.2 Entry Rear Valves, depending on which color is presenting the original 24.x:12.1 error code.
      The front panel will show the three colors on the selected side.
    2. Use the Up/Down keys to highlight the desired color.
    3. With the desired color selected on the front panel, press OK to activate the electrovalve.
      note:
      The electrovalve must be opened for ink to flow to the four-way valve.
      The front panel display will show the open or closed state of the valve.
    4. While the electrovalve is open, go to the four-way valve and tap gently on the valve using the end of a screwdriver or similar tool. This tapping may free a four-way valve that has become stuck in one position.
      Generally it will not be possible to see ink flowing through the four-way valve and the tubing in the ISM.
    5. After tapping on the four-way valve for a while, close the entry electrovalve using the front panel controls.
  5. Clear the error.
    1. Use the front panel keys to navigate to 4.14 No Flow Error Recovery.
    2. Use the front panel Up/Down arrows to select the desired color, then press OK.
      The printer displays the message OK then automatically restarts.

Intermediate tank overfilled due to entry electrovalve stuck open

The weight of an intermediate tank indicates how much liquid ink is present. A full intermediate tank weighs 1 kilogram (35.2 ounces or 2.2 lbs). The weights of the two intermediate tanks when a 24.x:12.1 error occurs may help determine the cause of the error. If the intermediate tank is overfilled it may prevent new ink from flowing into it.
  1. Using a Torx T30 driver, remove the ink system module (ISM) enclosure panels.
    note:
    It may be necessary to remove only one panel, depending on the color indicated by the error code.
    • Input-side or back ISM enclosure removal. Remove this panel for access to magenta, light magenta, and light cyan components.
        Figure : ISM input-side panel
        Removing the ISM input-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
    • Output-side or front ISM enclosure removal. Remove this panel for access to black, cyan, and yellow components.
        Figure : ISM output-side panel
        Removing the ISM output-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
  2. Remove the two intermediate tanks for the affected color by gently pressing each tank back into the machine and lifting up slightly on the front, then pulling the entire tank from its slot.
  3. Using a gram scale, weigh each tank individually.
    • If one intermediate tank is almost empty and the other one is 500 grams or less, it indicates that ink is not flowing properly from the cartridge into the system. Reinstall the intermediate tanks and repeat the troubleshooting of the entry electrovalve described above.
    • If one intermediate tank is almost empty and the other one is full, it indicates that the four-way valve is not opening and closing properly. Reinstall the intermediate tanks and repeat the troubleshooting of the four-way valve described above, then re-weigh the tanks. If there is no change in the tank weights, replace the four-way valve. The four-way valve may be replaced using HP spare part Q6702-60686 ISM Repair Kit, which includes one four-way valve configured for the front colors, one four-way valve configured for the back colors, and various related components.
    • If both intermediate tanks are full (i.e., weighing 1 kg each), it indicates that the entry electrovalve is stuck open and allowing ink to flow into the system continuously. Replace the entry electrovalve.
  4. Clear the error.
    1. Use the front panel keys to navigate to 4.14 No Flow Error Recovery.
    2. Use the front panel Up/Down arrows to select the desired color, then press OK.
      The printer displays the message OK then automatically restarts.

Improper ink pressure sensor calibration

Each ink pressure sensor has a unique calibration value that must be entered into the printer software. If the calibration value stored in the software does not match the specific sensor physically present in the ISM, the pressure readings will be erroneous and may cause various false error reports.
  1. Using a Torx T30 driver, remove the ink system module (ISM) enclosure panels.
    note:
    It may be necessary to remove only one panel, depending on the color indicated by the error code. Removal of the end panel allows easiest access to the sensors, but requires removing at least one of the side panels first.
    • Input-side or back ISM enclosure removal. Remove this panel for access to magenta, light magenta, and light cyan components.
        Figure : ISM input-side panel
        Removing the ISM input-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
    • Output-side or front ISM enclosure removal. Remove this panel for access to black, cyan, and yellow components.
        Figure : ISM output-side panel
        Removing the ISM output-side panel
      1. Torx T30 fastener (six locations)
      2. Enclosure panel
    • ISM end panel enclosure removal. Remove this panel for access to all ISM components except for intermediate tanks. At least one of the side panels must be removed for access to the interior fasteners.
        Figure : ISM end panel
        Removing the ISM end panel
      1. Internal Torx T30 fasteners (two locations)
      2. External Torx T30 fasteners (two locations)
      3. Enclosure panel
  2. Locate the ink pressure assembly for the affected color.
      Figure : Ink pressure assembly
      Identifying the ink pressure assembly
    1. The sensor board assembly. Each assembly has 3 sensors, one for each color handled by the board.
    2. Label with calibration values. There is a set of two values for each color. Each color is indicated by K, Y, C, M, LM, or LC, respectively.
    3. Offset values, indicated by the letter "O".
    4. Gain values, indicated by the letter "G".
  3. The calibration values for each sensor are printed on a label on the sensor board. Record the values for the respective colors on a piece of paper.
  4. Enter Diagnostic Mode.
    1. Press and hold the Cancel button and the Down arrow.
    2. Press and hold the Power button.
    3. Continue to press all three buttons.
      The LED indicator on the front panel will be steady-on red, then steady-on green, and then finally start blinking green.
    4. When the LED begins blinking green, release all three buttons.
      Figure : LX front panel
      LX front panel
    1. Cancel button
    2. Down arrow
    3. Power button
    4. LED
  5. With the printer in Diagnostic mode, use the front panel keys to navigate to 4.11 Ink Pressure Sensor Calib.
    The front panel shows the ink pressure sensor calibration values that are currently stored in the printer software.
  6. Compare the displayed values with the numbers copied from the physical pressure sensors in the ISM.
    Figure : Ink pressure sensor calibration
    Identifying the ink pressure sensor calibration
    • If the stored values match the physical numbers from the board, the calibration data is correct. Press Cancel to exit from the diagnostic.
    • If the stored values do not match the physical numbers, contact an authorized HP reseller or the regional HP Customer Care Center for further assistance.
  7. Remove the jumper from the Ink Pressure Sensor board after setting the values.
    note:
    If the jumper is removed before setting the values, then it’s possible an ink cartridge will be marked “Empty”. Once it’s marked as “Empty” it can not be changed, which would result in the loss of any ink left in the ink cartridge.
      Figure : Ink pressure sensor board
      Identifying the ink pressure sensor board jumper pins
    1. Jumper pins
  8. Clear the error.
    1. Use the front panel keys to navigate to 4.14 No Flow Error Recovery.
    2. Use the front panel Up/Down arrows to select the desired color, then press OK.
      The printer displays the message OK then automatically restarts.

Air in connector set or other ISM tubing

Air in the ISM affects the accuracy of the ink pressure readings, which can result in false 24.x:12.1 or errors or other problems.
If service was recently performed on the ISM components, such as replacing an electrovalve, four-way valve, connector set to the ink cartridge, tubing, or anything else that opened the ink system, air may have entered the system and must be removed.
Purging the ISM requires special accessories that were included with the printer when it was installed, specifically syringes, purging bags, and a special quick-connector for the tube routing system that is known informally as the "octopus" due to its multi-tubed appearance. If this equipment and a qualified individual are available to perform the purging, proceed to purge the ISM.
  • If the equipment cannot be located, order HP spare part Q6702-60431 Ink System Purge Kit to obtain a set of syringes, purge bags, and the quick connector.
  • If instruction or assistance is needed to perform the purging, contact an authorized HP reseller or the regional HP Customer Care Center for further assistance.

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