Diagnostic steps for faded receipts on TD terminals. Non-invasive troubleshooting focusing on thermal printer issues and external maintenance.
Incorrect paper can cause faded prints.
Incorrect voltage will cause problems.
High EMI can affect the performance of the printer's electronics.
Thermal printers rely on heat-sensitive paper. The printer head contains heating elements that selectively heat the paper, causing a chemical reaction that creates the image. Insufficient heat or contaminated elements result in faded prints. Voltage fluctuations can also affect the printer's heating element. Dust accumulation acts as a thermal insulator.
Receipts are printed with reduced ink density, resulting in faded or barely legible text and graphics. The issue persists across multiple receipt attempts.
Avoid using excessive force when cleaning the thermal printer head. Do not use abrasive cleaners or solvents. Ensure the terminal is unplugged during cleaning to prevent electrical shock. Static discharge can damage electronic components; ground yourself before touching any internal components or connectors. Follow Safe Handling procedures (unplug from power) before performing any maintenance.
Regularly clean the thermal printer head (every 1-2 weeks) to prevent buildup of contaminants. Ensure proper ventilation around the terminal to prevent overheating. Use only approved thermal paper. Ensure power cables are routed to minimize strain and damage. Address static discharge by grounding nearby surfaces, especially during dry seasons.
Some terminals have a built-in diagnostic print function accessible via a specific key combination (consult the TD terminal manual for the exact sequence). This can provide valuable information about the printer's status and performance. Note the darkness setting of the printer; some have a user-adjustable contrast.