How to Disassemble and Repair the Epson 4105 Printer

If your Epson 4105 printer does not work well, then you need to disassemble it to set up troubleshooting and repair. Whether you're experiencing scanner problems, paper pickup issues, or stripped sensors, this teardown shows you how to disassemble the device completely. Here are the main steps to disassemble the printer, recognize common problems and some basic repairs. You may also check out the video below, which visually shows how this is done.

Removing the Scanner Assembly

Twist the blue lock mechanism to open the scanner and initiate disassembly. If the scanner cable doesn't easily detach, you may need to take the outer casing apart. When the scanner cover is removed, take out all the screws which fasten the top panel and the additional screws located on the side.

A Flat Head Screwdriver that you can use to take the Waste Ink Tank out. With yet another screw removed the side panel is free. After this step, you must remove the duplexer to access the scanner assembly. Unscrew four screws and the blue holder. If that doesn't work, use two pinvices to pry the area where the Epson logo is located. The motor is coming off its rail, a common problem for scanners. If you move it around, the scanner might work again. The entire scanner assembly can then be pulled out after disconnecting cables.

Get a close-up look: Accessing the LCD Panel and Internal Components

The top panel screws are removed and the LCD panel is loosened by removing two screws. Now that the LCD panel screws are removed, lift the cover and pull out the LCD cable. Now you can remove the metal protector over the rail.

Inside the printer, you have the star wheel, PIS, and some extra screws that you need to remove to access more profound components. Next, unclip the capping station, the carriage return (CR) motor, and CR timing scale. The plastic hook that serves as a brake for the printhead can be pulled back to release the printhead assembly.

Removing the Sensors and Waste Tank Assembly

Remove the CR encoder and page width sensors after removing the printhead. You now want to locate the Continuous Ink Supply CIS assembly that hooks up to the waste tank. If the printer is not detecting the waste tank, then aesthetically check the assembly pins, which may be bent or misaligned. Pull out the plug and covering, if needed, to reach the gathering. Absorbent pads can also be picked up and washed at this stage.

Unscrew the Wi-Fi card to get started on removing the mainboard. There's a screw behind the card that needs to be reached through a hole on the back. Remove this screw, and the top plate comes off, revealing the mainboard. Unscrew all the other screws, the board should come out loose.

Fixing Paper Pickup Problems

The failure of paper pickup is a common problem with the Epson 4105. This is often due to effective pickup wheel rubber wear out. Use a flathead screwdriver to pry off the rubber for replacement gently. If your printer is grabbing multiple pages, examine the spring within the wheel assembly. If the spring is broken, replacing the spring will be a simple fix. BCH Technologies carries replacement parts.

Remove PF disc, PF sensor & motor for better paper handling. Cleaning up is creating new mechanical devices and measuring them to be sure they are in a good working condition, behind the areas of the printer where paper needs to go through; these parts greatly affect the performance of the printer.

Managing the Paper Guide and Ejection Sensor

Then, release the printhead cable bundle by pressing it in the middle of the fork until the cables are released. Next, these springs hold the paper guide, remove them. Bend the back feeder forwards and lightly pull it out.

The paper ejection sensor is on the printer's main board. To access the sensor, unscrew three screws along the top section and push the tabs on the top coordinates. Removing the bottom tray offers further access to paper feeding and ejection components.

How to Change the Spring and other Parts

A faulty internal spring in a printer that is malfunctioning may cause it to feed multiple sheets at once. This component is rather simple to replace. If you need a new one, check out BCH Technologies for quality replacement parts.

Disassemble the roller assembly, remove the LD shaft, and remove any other components that need service or replacement. You should now have all of the major parts out, allowing you to perform repairs, clean, and then reassemble them.