If your industrial printer keeps losing its message or failing to detect products on the production line, it can quickly become frustrating. One minute everything is running as it should, and the next the printer has stopped printing, missed a code or seems to have forgotten which message it should be using.
For production teams, the immediate concern is usually the same: how long has this been happening, how many products have been affected, and what needs to be done to get the line running properly again?
The good news is that intermittent printing problems don't always mean the printer has developed a serious fault. In many cases, the cause can be traced to a product sensor, a signal interruption, a message selection issue or a change in the way products are moving along the line.
The important thing is to work out which part of the process is causing the problem rather than repeatedly restarting the printer and hoping it behaves itself.
Although these problems can appear similar, there are two slightly different issues to consider.
Losing the product signal usually means the printer isn't receiving the trigger it needs to know when a product is in the correct position for printing. This signal often comes from a product sensor or from the production line's control system.
Without that trigger, the printer may not print at all, may miss products or may print inconsistently.
Losing the message means the printer is no longer using, displaying or printing the expected message. Depending on the system and how it is configured, this could relate to message selection, external control signals, communication with another piece of equipment or a problem with the printer's settings.
Understanding which of these is happening is the first step towards finding the cause.
A product sensor plays an important role in many industrial coding applications. It tells the printer when a product has reached the point where a code needs to be applied.
If the sensor is dirty, incorrectly positioned or beginning to fail, the signal can become intermittent. The printer may detect some products but miss others, even though the production line appears to be running normally.
This can be particularly noticeable when products are close together, move at different speeds or have reflective, dark or irregular surfaces that make reliable detection more difficult.
Start by checking:
If the sensor has been knocked or repositioned, even a small adjustment can make a difference.
Always follow the site's safety procedures before inspecting or adjusting equipment near a moving production line.
The printer relies on signals from other parts of the production line to operate at the right time. Depending on the installation, these may come from a product sensor, PLC (programmable logic controller), line controller or another connected machine.
If a connection is loose, a cable is damaged or a signal is being interrupted, the printer may receive the trigger inconsistently.
This can make the fault particularly difficult to pin down. The printer might work perfectly for several minutes before missing a product, then appear to correct itself without any obvious intervention.
If the problem started after maintenance, a change to the line layout or the installation of new equipment, it's worth considering whether any connections or control settings may have been disturbed.
Check for visible cable damage and any obvious signs of a loose connection, but leave electrical testing and internal repairs to a suitably qualified engineer.
On production lines where several products share the same printer, message selection is another area worth investigating.
A coding system may need to switch between different messages depending on the product, packaging format, batch or production order. This selection can be made by an operator or controlled automatically through a connected system.
If the printer is receiving the wrong selection signal, the message may not change when expected. If communication between the printer and the control system is interrupted, the printer may also fail to receive the information needed to select the correct message.
The printer itself might be working correctly, but the information reaching it is not.
Ask a few simple questions:
These checks can help establish whether the problem is linked to the printer's operation or to the wider production system.
Where product identification is important, don't assume that a printer displaying a message means the correct message is being applied to every product. Check the printed result as part of the investigation.
Sometimes the printer is blamed when the real issue lies in how products are travelling along the line.
Industrial printers need a reliable trigger and the correct timing to apply a code consistently. If products are too close together, moving unpredictably or passing the print position at a different speed than expected, the printer may struggle to trigger at the right moment.
Changes to conveyor speed, product guides, sensor positioning or the distance between the sensor and the printhead can all affect performance.
This is worth checking if the issue only occurs on a particular line, product format or production speed.
For example, if printing is reliable during a slower run but becomes inconsistent when production speeds up, that pattern is useful evidence. It may point towards a timing, detection or setup issue rather than a printer fault.
Avoid making adjustments at random. Record when the problem occurs and what has changed, so any necessary settings can be checked methodically.
Where the printer is connected to a PLC, production management system or other line equipment, the way those systems communicate can be just as important as the printer itself.
A change to an input configuration, trigger mode, message selection parameter or external control setting may affect how the printer responds.
This is especially relevant if the fault appeared after a printer was moved, a new product was introduced, control equipment was updated or another machine was integrated into the line.
It's worth reviewing any recent changes and checking the relevant settings against the intended operating configuration.
However, don't change parameters simply to see whether the problem disappears. An adjustment that masks one fault can introduce another, particularly where product codes, batch details or automatic message selection are involved.
If the settings appear correct but the signal is still intermittent, an engineer may need to investigate the input signal and the communication between connected equipment.
Intermittent problems are often easier to diagnose when you look at when they happen.
Instead of simply recording that the printer has stopped printing, try to identify the circumstances surrounding the fault.
Does it happen:
These details can help narrow down the possibilities before an engineer arrives.
It's also useful to record any warning messages shown on the printer, whether the expected message remains on the display, and whether the product sensor appears to detect every item.
A short record of the problem is often more useful than several unsuccessful attempts to restart the equipment. It can help an engineer focus on the likely cause rather than starting the investigation from scratch.
If the sensor is correctly positioned, visible connections appear secure and the problem continues, it may be time for a more detailed investigation.
You should consider engineering support if:
An engineer can investigate the signal path, check the printer's configuration and determine whether the issue relates to the sensor, the installation, the control system or the printer itself.
This matters because replacing a printer won't necessarily resolve a fault caused by an external sensor, wiring issue or incorrect control signal.
At Industrial Printer Services Ltd (IPS), we understand that unreliable coding equipment can cause unnecessary disruption, missed codes and additional pressure on production teams.
We support manufacturers with industrial coding and marking equipment, including Markem-Imaje continuous inkjet printers, and provide servicing, breakdown support, repairs, parts and consumables to help keep production moving.
If you're experiencing recurring message selection or product detection problems, we can help investigate the issue and identify the most appropriate next step.
Our aim is to help you get more reliable performance from your coding equipment, reduce avoidable downtime and keep your production line working as efficiently as possible.
When an industrial printer loses its product signal or appears to lose its message, the cause isn't always immediately obvious. It could be a sensor that needs attention, an interrupted signal, a message selection problem or a change in production line conditions.
The key is to establish exactly what the printer is doing when the fault occurs and work back through the process systematically.
If the problem keeps returning, don't let repeated restarts become the routine. Finding the underlying cause is a much better way to protect production time and ensure your products are being coded correctly.
Having trouble with a printer that keeps missing products or losing its message? Contact us today to discuss the issue and the support available for your coding equipment.
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