How to Identify and Replace the FFC Cable Next to the Power Port on an Epson ET-8550 Printer

Question:

On the Epson ET-8550, how can I identify the correct FFC cable to replace if it’s the one located directly next to the power cable on the mainboard?

Answer:

Identifying the Correct FFC Cable on the ET-8550

On the Epson ET-8550, the internal components are connected via multiple FFC (Flat Flexible Cable) connections. Each FFC connects specific components—such as the scanner, printhead, or control panel—to the mainboard. These connections are labeled on the board itself using a standardized format such as CN01, CN03, etc.

Step 1: Locate the CN Label

To determine exactly which FFC cable needs replacement, check the label on the mainboard where the FFC is inserted. The connector will be marked with something like CNxx (e.g., CN07).

• The connector next to the power cable is likely responsible for a function near the printer’s control logic—possibly the control panel or scanner board, but this depends on your printer’s revision.

• Remove the FFC gently and note the CN number printed on the mainboard.

Step 2: Reference the BCH Guide

Once you know the CN label, head over to our official ET-8550 FFC Reference Guide ([https://bchtechnologies.com/products/reference-for-ecotank-8550?_pos=3&_sid=4e4359d93&_ss=r]) where we’ve documented each FFC’s function, position, pin count, and more.

Step 3: Identify the Replacement

You have a few options to identify or order the correct FFC:

1. Pin Count – Count how many pins are on the FFC.

2. Length Measurement – Measure the total cable length (in millimeters).

3. Function Search – If you know the component it connects to (e.g., scanner, control panel), use that information along with "ET-8550" as a keyword on bchtechnologies.com (https://bchtechnologies.com).

For example, search for:
ET-8550 control panel FFC cable
or
ET-8550 CN03 FFC

This will give you listings with exact dimensions, pin numbers, and connector types.

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 question and continued trust in BCH Technologies. We’re always here to help where we can, and we’re honored to be part of your repair journey.