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HP Scitex LX600 Printer series - End of Roll Reached/Media Slippage

Issue

System Error 78.X:01- End of roll reached/Media Slippage (ADVISORY).

Solution

From the Maintenance and Troubleshooting Guide:
The substrate is not attached to the input core.
If the printer detects a lack of tension during the substrate check after loading, it will ask to confirm the winding direction. If the roll is not firmly attached to the input core during printing, end-user may see banding on the prints.
If end-user sees an error message numbered 78... while printing, it means that the substrate may have become detached from the rear spindle, or the core is slipping on the spindle. This could mean that end-user has reached the end of the roll, or the spindle is not correctly inflated, or the dual-roll differential hub is locked.
The substrate is automatically unloaded when this error occurs. End-user should respond to this error in the following ways.
  • Check whether end-user has reached the end of a roll.
  • For single-roll printing, check that the spindle is correctly inflated.
  • For dual-roll printing, check that the differential hub is unlocked.
  • Check that the hubs are tightly secured to the spindle.
  • Check that the diameter of each substrate core is not too large for the spindle.
  • Check that each substrate core is tightly connected to the hubs on each side of it. If the roll is not firmly attached to the input core, proceed as follows.
  1. Unload the roll from the input spindle and load it onto the output spindle. Take care to avoid telescoping.
  2. Raise the pinches and, in the front panel's Substrate Management menu, raise the carriage beam to its maximum height.
  3. Unload substrate from the roll and pass it backwards through the printer towards the input spindle. Attach it to the empty core on the input spindle, securing it with adhesive tape. Wrap a couple of turns of substrate around the input core. Take care to align the substrate with the output roll.
  4. Lower the pinches.
  5. Go to the HP Internal Print Server and select Substrate > Load/Unload, then select the printer configuration and press Load.
    Poznámka:
    If the substrate check fails, return the roll to the input side and attach it to an empty core on the output side. Raise the pinches and use the front panel's Substrate Management menu to move all the substrate onto the output core.
  6. Select the correct substrate in the HP Internal Print Server.
  7. Press the Move substrate key on the front panel, then the Back key, and wait until all the roll has been wound onto the input spindle.
  8. End-user may decide to cancel rewinding when the substrate is detached from the output roll. Then attach it to the output core to print immediately, or rewind it completely onto the input core if end-user wants to remove the roll.
From the Service Manual:
SE Code: 78.X:01- End of roll reached/Media Slippage (ADVISORY)
Description: This collection of system errors are all advisory system errors, they are triggered when the values detected for media movement and tension do not correspond to the expected values (i.e. Media moving, but input spindle is not rotating). With these system errors the appropriate message will be displayed in the front panel for appropriate user’s reaction:
  • 78.2:01: Potential end of the roll.
  • 78.3:01: Substrate may be detached from the rear spindle or slippage detected after forward movement.
  • 78.4:01: Substrate may be detached from the rear spindle or slippage detected after backward movement.
  • 78.5:01: Substrate may be detached from the front spindle or slippage detected after forward movement.
  • 78.6:01 Substrate may be detached from the front spindle or slippage detected after backward movement.
Problem causes in order of importance:
  1. True end of the roll (media finished in one spindle system)
  2. Media/Core/Spindle slippage
  3. Spindle damaged with Air leak
  4. Drive roller encoder disc faulty
  5. Drive roller drive/ Media path system failure
Corrective action
  1. True end of the roll (media finished in one spindle system)
    Check the input or output spindle, ensure the media has not finish and detach from the core. Repeat the media load procedure or perform the appropriate media handling (i.e. media removal).
  2. Media/Core/Spindle slippage
    Check the media spindle attachment; inflate more the spindle to ensure correct core attachment. In order to check the system is not slipping place a mark in the media, the core and the spindle to check which one is moving.
  3. If the media is slipping on the roll:
    • If the media is slipping between the media and the core it is important that the end of the media is glued/stuck to the core. It might be possible that the media has to be rewound onto a new core, with the edge taped to the core.
    • If the media is slipping because the core and the spindle, check that the spindle is inflated to at least 5.5 bars (80psi) (as per the site preparation guide) As a workaround if there is an air leak in the input spindle, end-user could change over with the output spindle (but it must be replaced at a later date).
  4. Check the media used is correctly rolled on to the core (end-user can use a different media roll to check for this issue), ensure the tension settings used in the printer are the appropriate ones for the media, and that the roll of media used is able to handle them. Reduce tension and system vacuum levels if required (note: ensure the values are still appropriate to control the media in the print zone).
  5. 5. LX800: In the case of dual roll, check the rubber latched with the different core systems, replace the rubber latches if required or re-tighten the core supports.
  6. Spindle damaged, air leak
    If the attachment on the spindle constantly loses latch, the spindle will be losing air pressure (air leak). Perform the appropriate repair procedure re-tighten the end latches or replace the spindle valve. Replace the damaged spindle if the Air leak issue cannot be repaired.
  7. Drive roller drive/Media path system failure
    Check that the Driver Roller Motor is secured correctly and is not loose, also check the mounting bracket is correctly installed, and is not loose.
    1. With the printer turned off, try to rotate the Driver Roller, under normal circumstances, this should be impossible.
    2. Check that the input spindle and the output spindle can move horizontally by approximately 5mm (0.4 inches).
    3. Check the latches are correctly securing the Spindles.


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