If the error persists after cleaning and resetting, what hardware components should I suspect?

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Grade: Education Subject: Support
If the error persists after cleaning and resetting, what hardware components should I suspect?
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If cleaning and resetting don't work, suspect the printhead (even after cleaning, it might be damaged), the ink supply system (pump, tubes, valves), the main PCB (motherboard), or the power supply. These require more advanced diagnostics and potentially replacement.