Question:
I am using the printhead pin chart to test my Epson print head, and I noticed that your video explains the green Ground pins but doesn't cover the blue Ground2 connections. When I test the Ground2 pins, I don't get any continuity between them. Is this normal, or does it indicate a problem?
Answer:
When testing printhead connections with the pin chart for Epson printheads (https://bchtechnologies.com/products/pin-chart-ffc-pin-testing-chart-for-printhead-l1800-1430-1390-digital-download), it's important to understand the difference between the standard Ground pins (usually marked in green) and the Ground2 pins (often shown in blue).
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Ground Pins (Green): These are the main return paths that connect together internally. When you test them with a continuity meter, you will see they are all tied together, which is why continuity shows up between any two green ground points.
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Ground2 Pins (Blue): These are not the same as the main ground. Instead, they serve as isolated return paths for certain circuits inside the printhead-such as the heater elements or driver logic. Unlike the green grounds, they are not internally linked to each other. That's why, when you test the blue Ground2 pins, you won't get continuity across them.
This design is intentional and normal. Epson separates Ground and Ground2 lines to reduce electrical noise and interference between different functional sections of the printhead. The main grounds handle general returns, while the Ground2 pins help keep sensitive circuits stable.
So, to answer your concern directly: it's expected that all the green grounds show continuity, while the blue Ground2 pins do not. The absence of continuity in Ground2 pins does not indicate a fault in your printhead-it's simply part of how Epson engineers these heads.
Addressing printer issues can be a complex matter because of the hands-on nature of repairs. For that reason, we cannot provide detailed remote troubleshooting. However, we do offer in-person diagnostics and repair services at our local repair facility (https://bchtechnologies.com/printer-repair-service). Due to high demand, we work on a first-come, first-served basis, and wait times may be a few weeks. We can repair full printers or specific parts, depending on your needs. That said, we understand our rates may not be the most budget-friendly, so we strongly encourage self-help and continued research. A great place to start is our YouTube channel's homepage (https://youtube.com/@bchtechnologies). You can find videos efficiently by using the search icon next to the "About" tab in the menu bar. I've created videos for over nine years, and while I may not recall every single one, the search function can help you locate them quickly. YouTube may also recommend related content from other creators that could be helpful.
Thanks again for your thoughtful question and for supporting BCH Technologies. We appreciate your engagement and look forward to continuing to assist the printer community with detailed resources and guidance.