Epson L1800 / InkSonic-Modded Setup: EPS-155E vs EPS-135 Compatibility, S-75-24 Board, and Ink Tank Air-Filter Leak Fix Options

Question: I really appreciate how quickly you respond-even on a weekend/holiday-and I'm grateful for Kevin's videos and all the help from BCH. I found an Epson EPS-135 on your website and I'm hoping it might be interchangeable with the EPS-155E I believe I need. I also think my InkSonic-modified Epson L1800 uses an additional S-75-24 board (the "silver" board), and I understand proper capacitor handling.
Can you confirm whether both components should be replaced, and if BCH sells them, can you tell me where to find them on your site? I'm also trying to find Kevin's video about modifying hoses to make cleaning white ink lines easier so I can order the parts.
One more question: I have a leak around the black air-filter connection on the ink tanks. Tightening the screw didn't help. Do you sell silicone pads or anything that can stop the leak? (Photo attached.) I understand no repair is guaranteed.

Answer: 

1) EPS-135 on our site vs. the EPS-155E you need (interchangeability)

At this time, we do not carry the EPS-155E, and we cannot confirm EPS-135 ↔ EPS-155E interchangeability as a safe swap. Power supplies in these systems are not "universal," even if they look similar. Differences that matter include:

• Output voltage and amperage ratings (a mismatch can cause undervoltage, overheating, or failure)

• Connector type/pinout and harness mapping

• Mounting/grounding differences

• Built-in protection behavior (overcurrent/overtemp characteristics)

Because the L1800 base platform is often modified by third parties (like InkSonic), the "correct" part is usually defined by their specific conversion design, not Epson's original configuration. For that reason, the safest path is to source the exact EPS-155E specified by InkSonic (or the exact substitute they explicitly approve).

2) The "silver thing" / S-75-24 board and whether both parts should be replaced

You're correct to be cautious here-DTF conversions frequently add a secondary power stage or auxiliary board to support added loads (white ink circulation, heaters, extra pumps, control logic, etc.). However:

• We do not sell the S-75-24 board, and

• We can't reliably tell you whether both components should be replaced without hands-on diagnosis and confirmed part numbers from the conversion provider.

In many real-world cases, replacing only one component can lead to repeat failure if the original cause remains (shorted load, failing pump, damaged cable, incorrect fuse rating, etc.). Since this unit is InkSonic-modified, InkSonic is the correct source to confirm:

• Whether EPS-155E and S-75-24 are both required in your exact build

• Which revision/version you must use

• Any matching cables, connectors, or mounting hardware that must be ordered together

Also, thank you for mentioning capacitor safety-power boards can store a dangerous charge even when unplugged. If you continue any internal work, always follow appropriate discharge procedures and safety precautions.

3) Finding the hose-mod video for easier white ink line cleaning (and ordering parts)

We definitely understand what you're referring to-white ink setups are notorious for clogs and maintenance headaches, and hose changes can make flushing and cleanup easier.

The fastest way to locate that exact video is to go to our channel homepage and use YouTube's built-in search:

• Visit: BCH Technologies on YouTube (https://youtube.com/@bchtechnologies)

• Use the search icon near the channel menu (around the "About" area on the right side depending on your device)

• Try keywords like: white ink, flush, hoses, lines, cleaning, DTF, L1800

Once you find the video, check the description-Kevin often lists parts, sizes, and links there when applicable.

4) Leak at the black air-filter connection on the ink tank (tightening didn't help)

A leak at the air-filter/vent connection usually means you're dealing with one (or more) of these issues:

• Damaged or missing gasket/O-ring at the fitting

• Cracked plastic port on the tank lid (tightening won't fix a crack; it can make it worse)

• Cross-threading or uneven seating of the fitting

• Incorrect vent/filter orientation or a filter that's saturated/blocked, causing pressure behavior you don't expect

• Warped lid or contamination (ink residue) preventing a seal

Regarding parts availability: we do not sell silicone pads for that seal at this time. Since your tanks and vent hardware are part of an InkSonic-modified ecosystem, the most reliable fix is typically to obtain the exact replacement fitting/gasket/tank lid assembly from InkSonic (or the specific tank system vendor), because thread specs and sealing surfaces vary a lot across tank models.

If InkSonic offers a replacement gasket/O-ring, lid, or vent fitting, that's usually the cleanest solution. If they don't, many users end up replacing the entire lid or tank rather than trying to "patch" it-especially if there's any cracking around the port.

Addressing printer issues can be a complicated affair because these problems are hands-on and often depend on physical inspection, measurements, and part verification. Because of that, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. We do offer an in-person evaluation and repair service through our local diagnostic facility: Printer Repair Service (https://bchtechnologies.com/printer-repair-service). Due to high demand, we operate first-come, first-served, and it may take a few weeks before we're able to accept your printer for drop-off. Our services can cover either a full printer or specific components, with clear instructions on how to proceed. That said, we understand our rates aren't the most economical-so we strongly encourage self-help through online research. You can start with YouTube, including our channel homepage at BCH Technologies on YouTube (https://youtube.com/@bchtechnologies). To find the most relevant content quickly, use the search function near the "About" section-since we've created videos over the past nine years, it's difficult to remember every single one on demand. Using YouTube search is the most efficient approach, and YouTube may also recommend relevant videos from other channels that can help.

Thanks again for your kind words and for supporting BCH Technologies. We truly appreciate you taking the time to share details and photos, and we're wishing you the smoothest possible repair outcome with your setup.