How to Test Narrow Power Supply Wires in Printers (Using Multimeter Probe Kits)

Customer Question:

What’s the name of the orange wire you used in the video? I’m having trouble testing the power supply wire—it has a small hole, so I can’t insert my multimeter probe.

Answer:

Now, to your question: the wire you're referring to in the video (linked here [https://www.youtube.com/watch?v=yU767zbVgWE&lc=UgzjT6H7x2xqIyY38a14AaABAg]) appears to be part of the power supply harness, and from your description, you're struggling to get a multimeter probe into the connector because of its small size.

This is a common issue with modern printer components. Many power supply sockets—especially in inkjet printers—use very narrow terminals, often intended for tight internal connections. These terminals are not designed with testing probes in mind, which can make troubleshooting tricky.

To safely and effectively test such wires, we recommend using a multimeter lead kit with fine-tip probe accessories or multimeter back probe pins. These kits come with thin needle-like tips that are specifically designed to fit into small spaces such as compact connectors and terminal blocks. Here's one you can check out: Multimeter Lead Kit (https://amzn.to/3GmBbwv).

These tools allow you to:

• Probe into tight sockets without damaging the terminals.

• Maintain safe and secure contact with live circuits.

• Avoid using sharp objects or forceful insertion that might bend or deform internal connector pins.

When testing, ensure the power is ON only when taking measurements and OFF when connecting/disconnecting probes. Be sure to set your multimeter to the correct setting (e.g., DC voltage when checking a printer’s internal power supply).

Please Note:

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. So, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. We offer an in-person evaluation and repair service via our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). Given the high demand, we operate on a first-come, first-served basis. So, it might take a few weeks before we can get your printer to drop it off. Our services are structured to repair either a whole printer or specific parts, with clear instructions on how to proceed. However, we acknowledge that our rates aren't the most economical. Thus, we highly recommend that you resort to self-help via online research. You can start by checking out YouTube or visiting our YouTube channel's homepage (https://youtube.com/@bchtechnologies). Look for specific videos using the search icon next to "About" on the right-hand side of the menu bar. I receive dozens of queries every day asking about videos for specific topics. Having created videos over the past nine years, it's challenging to remember every single one. Therefore, using YouTube's search function would be most efficient. Plus, YouTube might suggest relevant videos from other channels that could assist you.

Thanks again for your support. We're always here to help educate and guide our community through common (and not-so-common) printer repair challenges!