A Continuous Ink Supply System (CISS) is designed to provide a high-volume, cost-effective alternative to standard ink cartridges. However, it can be a source of various frustrating faults. The most common issues are air bubbles and clogged printheads. Air can enter the ink lines during installation or after a long period of inactivity, creating a blockage that prevents ink from reaching the printhead. Similarly, if the printer is not used regularly, ink can dry and crystallize inside the fine nozzles of the printhead, leading to streaky, missing colors, or complete print failure. These problems are often exacerbated by using low-quality or incompatible inks.

Another frequent problem involves incorrect ink levels or pressure imbalances within the system. The external tanks must be kept at the same level as the printer to maintain proper hydrostatic pressure. If a tank is placed too high, it can cause ink to over-supply and leak into the printer, potentially causing severe internal damage. Conversely, if the tank is too low, ink may not flow effectively to the printhead. Furthermore, faulty or poorly sealed valves and air holes in the external tanks can disrupt the pressure balance, preventing ink flow and leading to printing artifacts. Regular maintenance, including priming the system, cleaning the printhead, and ensuring all seals are tight, is crucial for stable CISS operation.

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