How to Replace the CR Encoder Sensor Board and FFC Cable on Your L1800, R1390, 1390, 1430, 1400, and 1410 Printer

 In this guide, we'll walk you through the process of replacing the CR Encoder Sensor Board and FFC cable in models such as the Epson L1800, 1390, 1430, and 1400. We have a video below to show you how it's done.

Understanding the 13 Pin Carriage Return and Page Width Sensor Cable

The 13 Pin Carriage Return (CR) and Page Width (PW) sensor cable is a vital part of your printer's functionality. It runs from the printhead carriage to the main board and is responsible for detecting the carriage return position and the width of the paper. Without it, the printer cannot correctly sense where the printhead should be or the paper size, leading to errors and misprints.

First, check the connection of the sensor cable to the main board if you encounter any issues. If the cable is connected properly but the problem persists, you might need to replace the cable. BCH Technologies offers replacement 13 Pin CR and PW sensor cables, which you can find by searching for "13P CR PW" on their website.

Removing the APG Assembly

The first step in replacing the CR Encoder FFC cable is to remove the APG assembly. This assembly spans the full width of the printer and must be carefully removed. For detailed instructions on how to do this, refer to our accompanying video.

Removing the Frame Support

Next, you'll need to remove the frame support on the right side of the printer. This involves turning a half-moon-shaped component so that the flat side is on top. If your printer still has a left frame support, remove it as well.

Removing the Torsion Springs

Two large torsion springs push the rod down and must be removed. These springs have direct contact with the rod and are relatively easy to remove. Pay close attention to the orientation and position of the springs, as they stabilize the assembly that holds the CR scale. Removing these springs without understanding their function can result in a wobbly assembly.

Removing the Drive Belt

On the left side, at the back of the printer, there's a strong extension spring that needs to be removed with care to avoid injury. Once the spring is removed, you can proceed to remove the drive belt and four screws on the top, allowing you to access the rail guard.

Removing the Rail Guard

With the drive belt removed, you can now remove the rail guard. This part is necessary to access the other components required for replacing the CR Encoder FFC cable. The printer used in this demonstration is a DTF Pro Fusion Model J, but the procedure is similar for other models as well.

Moving the Parallelism Adjustment Tab

On the left side, there's a piece that adjusts the parallelism of the rod. Mark its position before removing it to ensure you can reassemble it correctly. This piece must be moved (not removed) to prevent interference with the rod during the next steps.

Removing the CR Scale

The CR scale is the component that reads the clear belt. If your printer cannot read this scale, it will not function correctly. Carefully remove the scale, noting that some models, like the Model J, may have screws installed backward. Keep the scale safe if you plan to reuse it.

Removing the Main Rod Spacer

Using a small pair of pliers, remove the white spacer on the main rod. This spacer helps to keep the rod in place and must be removed to proceed with the cable replacement.

Removing the Gears

Remove the washer and gear on the right side by expanding the washer with a dental tool. Repeat this process on the left side. This cable replacement is one of the most challenging tasks, so ensure you follow the steps carefully.

Removing the Main Rod

The main rod can now be lifted out. Slide it to the left and lift it up. This part may look intimidating, but it's essential for accessing the CR Encoder FFC cable.

Removing the Drive Belt and Encoder Cover

Remove the drive belt and encoder cover. This cover has tabs on the top and sides that need to be carefully released. Once removed, you will have access to the sensor PCB board.

Replacing the CR Encoder Sensor Board

The CR Encoder sensor board is different in various printer models. The Model J uses a third-party board held with glue instead of screws. Replace this with a genuine Epson board if possible, as it provides more reliability. BCH Technologies offers a 13 Pin cable replacement that can be folded to match the old cable's folds.

Installing the New 13 Pin FFC Cable

After replacing the sensor board, install the new FFC cable. Thread it through the catch return and plug it in. If your printer doesn't have a PW sensor, leave that slot empty. Make necessary adjustments in your RIP software to disable the page width detection.

Reassembling the Printer

Reassembly involves several steps:

• Install the Drive Belt: Ensure the teeth side of the belt is inside the loop. Align the belt correctly to avoid installation issues.
• Install the Main Rod: Slide the rod back into place, ensuring it moves freely up and down.
• Install Gears: Reinstall the washer and gear on the left and right sides. Ensure the half-moon piece is correctly positioned.
• Install the CR Cable & Holding Assembly: Thread the CR cable through the slot and attach the belt to the holder. Reinstall the torsion springs to stabilize the assembly.
• Install Torsion Springs: Reinstall the torsion springs that push the rod down.
• Install the APG Assembly: Reinstall the APG assembly following the detailed steps provided in our video.
• Install the FFC Cable into Cable Holder: Secure the FFC cable in the black holder by sliding the tabs into place.

Once reassembled, perform a test print to ensure the printer functions correctly. This process may seem daunting, but with patience and careful attention to detail, you can successfully replace the CR Encoder FFC cable and restore your printer to optimal performance.

For more detailed visual guidance, watch our video below. Visit us at BCH Technologies for more information and supplies.