How to Replace the F1 and F2 Fuses on the Epson ET-8550 Mainboard

Usually though, when your Epson ET-8550 printer stops responding due to something wrong with power, a blown fuse on the mainboard is the suspected one. These fuses (F1 and F2) will regulate your printer circuit's electrical flow. If one of these fuses breaks, your printer might not respond or refuse to turn on.

Replacing the F1 or F2 fuse is pretty simple if you can access the right instruments and follow specific instructions. This guide will walk you through the steps to test and replace these fuses to help get your printer working again. For those who do not want to try to repair themselves, BCH Technologies can repair your Motherboard. You will want to keep your printer running in tip-top shape.

And we have a video — embedded below — that demonstrates precisely how.

How to find the correct fuse for your ET-8550

You should check that you have the pre-requisite replacement fuse before you get started. The only fuse used in this device is on the same fuse for the F1 and F2 positions on the mainboard of the ET-8550. Search for “F1” on BCH Technologies’ website to find this fuse.

The fuses are tiny, making them challenging to handle. They are smaller than regular razor blades, which gives you a sense of their size. Because they are fragile, you should always use proper equipment and follow the appropriate replacement procedure.

Testing the Fuse with a Multimeter

This cycle will continue until you replace the fuse or prove it is malfunctioning. An analog or digital multimeter set to continuity (or “beeping”) mode will help you determine whether the circuit is closed.

Set the Multimeter to Beeping Mode – This setting makes the multimeter beep when you complete an electrical circuit.

Test the Multimeter Itself: Touch the two probes to ensure the device functions correctly. The beep indicates that the multimeter works as expected.

Test the Fuse: Place the probes on the two outer faces of the F2 fuse. If the multimeter beeps, the fuse is okay, and you do not need to replace it.

Check the Fuse Soldering. If the circuit beeps, the fuse may be still working but not soldered properly. Resoldering it might solve this problem.

Check the Fuse Itself. Bring the probes closer to the fuse. If you hear no tone, the fuse is blown and needs to be replaced.

When you find that the fuse is bad, replace it.

Removing the Faulty Fuse

Removal and installation should be carried out with care and the appropriate tools. It is much easier with a hot soldering iron and decent solder.

Set the Soldering Iron – Heat it to its optimal temperature.

Add Solder to the Fuse – The soldering iron tip will create a tiny droplet of melted solder as it contacts the fuse.

Detach the Fuse – Hold your soldering iron lightly against the fuse until it comes free from the board.

Pretreating how to fix a blown fuse in the AC unit: Clean the Soldering Area. Once the fuse has been removed, clean the contact points for the new fuse.

The fuse is tiny, so you must handle it carefully, otherwise it will damage the surrounding components.

Installing the New Fuse

The following is the position in which the new fuse should be placed on the mainboard after removing the old fuse.

Place Fuse Into Place – Using precision tweezers, place the new fuse where the old one used to be.

Solder One Side At A Time: Heat one side of your fuse and apply a little solder to hold it in place.

Get the Other Side Soldered—After one side is in place, solder the other to finish the connection.

Make sure both ends are well attached to the board.

The fuses will also need to be tested once again to ensure they have a proper connection after being soldered.

Verifying the Repair

After replacing the fuse, use your multimeter again to repeat the continuity test.

Test the Outer Sides: Touch the multimeter probes to the outer sides of the fuse. A beep confirms a closed circuit, meaning you've just successfully replaced the clip.

Do Not Check the Inner Sides – When performing the checks, the inner part of the fuse is always delicate. You need to check with the outside connections.

At this point, you're finished replacing the fuse, and your printer ought to work again.

Professional Repair Services

For those who find replacing the fuse too complicated, BCH Technologies provides professional repairs of printer motherboards. Rather than simply replacing the fuse, our technicians conduct a complete diagnostic to verify that the rest of the board is functioning correctly before sending it back to you.

To use our repair service:

Visit BCH Technologies.

Select the Repair option on the left side.

Click on the option of Motherboard Repair.

This includes checking for further problems with the motherboard, so you will not have to worry about your printer failing to work correctly again.