Where Does the 13-Pin Printer Carriage Flat Cable Connect on an ACHI R1390 A3 Roll DTF Printer?

Question

I purchased a 13-pin flat carriage cable that runs from the back of the printer carriage to the motherboard on my ACHI R1390 A3 Roll DTF printer. Unfortunately, I did not see where it became unplugged from on the printer carriage, and I have not been able to find much information online showing exactly where it connects. Do you have any ideas about where this cable should plug in or what I should check?

Answer

For an ACHI R1390 A3 Roll DTF printer, the base print engine is usually derived from the Epson R1390, L1800, 1390, or 1430 style platform. Many DTF manufacturers modify the frame, add roll-feeding hardware, add white ink circulation, add external boards, or reroute cables, but the carriage wiring layout is still generally based on the Epson-style carriage assembly.

The 13-pin flat cable you described is most likely the CRPW sensor cable or a carriage-related flat flexible cable. On Epson R1390/L1800/1390/1430-style printers, a 13-pin cable is commonly associated with the carriage area and may connect to a small sensor board or carriage-side connector rather than directly to the printhead itself. Depending on the exact ACHI modification, this cable may be routed from the carriage area toward the main board or a small intermediate board.

The most important thing is not to guess the connector by force. A flat flexible cable can physically fit into more than one similar-looking socket if the printer has multiple FFC connectors nearby, but the pin count, orientation, and contact direction must match. Plugging the cable into the wrong socket, reversing the contact side, or inserting it crooked can damage the motherboard, sensor board, carriage board, or printhead circuit.

First, inspect the printer carriage carefully from the back and side. Look for a narrow 13-pin FFC socket on or near the carriage assembly. It may be mounted on a small board attached behind the carriage, near the page-width sensor, CR encoder sensor area, or cable guide. On many Epson-style carriage assemblies, the cable does not plug into a large obvious motherboard-style connector on the carriage. Instead, it may slide into a small flip-lock or friction-lock connector on a sensor board or carriage PCB.

A useful way to identify the correct location is to look for a connector that matches these signs:

The socket should have 13 positions, not just a similar width. Count the visible pins or contact grooves if possible.

The socket should be in the carriage path or mounted on a small carriage-side board.

There should usually be evidence that a cable was previously installed, such as a clean mark, cable bend memory, old adhesive, or a cable path that naturally reaches that area without twisting.

The cable should reach the socket comfortably without stretching, folding sharply, or crossing moving parts.

The cable should not interfere with the carriage movement, timing belt, encoder strip, ink tubes, or roll-feed conversion hardware.

Also check the cable contact orientation. Flat flexible cables usually have exposed metal contacts on only one side. The connector may require the contacts to face up or down depending on the socket design. If the cable has a blue stiffener, the blue side usually faces away from the contacts, but that does not automatically tell you whether the contacts should face front, back, up, or down. You need to match the contact side to the connector's internal contacts.

Before reconnecting the cable, power the printer off and unplug it from the wall. Do not connect or disconnect carriage cables while the printer is powered on. Even standby power can be enough to short a board if the cable touches at an angle.

If the connector has a locking tab, lift or open the tab gently before inserting the cable. Insert the cable straight and evenly, making sure it goes in fully and squarely. Then close the lock. If the connector is a friction-style socket without a flip lock, the cable should slide in smoothly and sit evenly. Never force it. If it feels blocked, the angle, orientation, or connector may be wrong.

Since you mentioned that the cable runs from the back of the printer carriage to the motherboard, I would also trace the old cable path if any part of it is still visible. Look for cable clamps, tape marks, plastic guides, or the natural bend direction of the replacement cable. These clues are often more reliable than general online photos because converted DTF printers are frequently modified by the seller or builder.

If the printer was working before the cable came loose, it may help to inspect nearby sockets for an empty connector. Most working carriage assemblies will not have several unused carriage-side FFC connectors. An empty 13-pin socket near the carriage is a strong clue, especially if the cable length and bend line up naturally with it.

Be careful not to confuse this 13-pin carriage/sensor cable with the printhead ribbon cables. The printhead cables usually have a different pin count and are routed directly to the printhead. Mixing up carriage sensor cables and printhead cables can create serious electrical problems. If the printhead cable is reversed or inserted into the wrong connector, it may damage the mainboard or the printhead. Since printheads and motherboards are expensive, it is better to pause and verify than to try multiple positions.

If the printer shows errors after reconnecting the cable, the symptoms can help identify whether the connection is correct. A loose or incorrectly seated carriage sensor cable may cause carriage movement errors, sensor errors, failure to initialize, or the carriage slamming to one side. On Epson-style printers, related issues may appear as general fatal errors, service errors, or carriage/encoder-related problems. Depending on the software or RIP system, you may not always see a clear Epson-style numeric error code. Some converted DTF printers only show a general communication, carriage, or fatal error. If you do see a specific error code, it is worth writing it down exactly because codes related to carriage movement, encoder reading, or sensor detection can point to the affected cable or board.

Common causes after replacing or reconnecting this type of cable include:

The cable is inserted backward.

The cable is not fully seated.

The connector lock is not closed.

The cable is plugged into the wrong socket.

The cable contacts are dirty, scratched, folded, or cracked.

The cable was damaged during installation.

The carriage sensor board or connector was damaged when the original cable came loose.

The encoder strip was touched, contaminated, or knocked out of position during the repair.

The cable routing is preventing the carriage from moving freely.

For a roll DTF printer, also check that the cable and tubing are not fighting each other. DTF conversions often add extra ink lines, dampers, waste tubes, white ink circulation lines, and sometimes extra brackets. If the cable is routed too close to the ink tubing, it can get pulled loose again when the carriage moves. The cable needs enough slack for full carriage travel, but not so much slack that it rubs against the encoder strip, belt, or frame.

If you are unable to identify the socket visually, the safest approach is to compare your carriage assembly to photos or videos of an Epson R1390, Epson 1390, Epson L1800, or Epson 1430 carriage disassembly. The ACHI machine may look different because of the DTF conversion, but the carriage-side cable and sensor locations may still be similar. Search specifically for terms like "Epson R1390 carriage cable," "Epson L1800 CRPW sensor cable," "Epson 1390 carriage sensor cable," or "Epson 1430 carriage FFC cable." You may also search our YouTube channel using the channel search function rather than the general YouTube search bar.

If you purchased the cable from us or from a listing that describes it as a "13-Pin CRPW Sensor Cable" for Epson L1800, 1390, or 1430 DTF/DTG printers, then that confirms it is likely a sensor-related carriage cable rather than a printhead cable. In that case, focus your search around the carriage sensor board or CR/page-width sensor area instead of the printhead ribbon sockets.

If possible, take clear photos before reconnecting anything. Take one photo of the back of the carriage, one photo of the motherboard area, and one wider photo showing the cable route. If you later need help from the printer seller, cable supplier, or a local technician, those photos will make it much easier to identify the correct socket.

Addressing printer issues can be a complicated affair because many of these problems require hands-on inspection. For that reason, we are not able to provide remote troubleshooting, remote repair suggestions, or remote support for individual printer repairs. We do offer an in-person evaluation and repair service through our local diagnostic facility: BCH Technologies Printer Repair Service [https://bchtechnologies.com/printer-repair-service]. Because demand is high, we operate on a first-come, first-served basis, so it may take a few weeks before we can accept a printer for drop-off. Our services are structured to repair either a whole printer or specific parts, with instructions provided on how to proceed. However, we understand that our repair rates may not be the most economical option for everyone. For that reason, we strongly encourage self-help through online research. A good place to begin is YouTube, including our YouTube homepage at BCH Technologies on YouTube [https://youtube.com/@bchtechnologies]. Once you are on our channel page, use the search icon next to "About" on the right-hand side of the menu bar to look for specific topics. I receive dozens of questions every day asking where to find videos on certain repairs. Since we have created videos for more than nine years, it is difficult to remember every individual video, so YouTube's search function is usually the fastest method. YouTube may also recommend helpful videos from other creators that apply to your specific printer model or conversion.

Thank you again for reaching out. I hope this gives you a safer way to identify the correct connection point and avoid damaging the carriage board, motherboard, or printhead while reinstalling the 13-pin flat cable.