Epson 1390 Ink-Out Error After Mainboard Replacement - Causes and Fixes

Question:
I replaced the motherboard in my Epson 1390 about 18 months ago after accidentally blowing the transistors when removing the printhead while the printer was still powered on. Since then, I cleared all the ink lines, drained the system, replaced the capping station kit, and even installed a new printhead. Now, when I boot the printer, I keep getting an "ink out" error that I can't bypass. I also purchased a firmware key, but it won't install. What could be causing this issue, and how can I get my Epson 1390 running again?

Answer:

From your description, here are the most likely reasons for the persistent ink-out error:

1. CN15 Connection on the Mainboard

• On the Epson 1390, the CN15 connector plays a role in linking the cartridge chip sensor circuit. If this connector is loose, damaged, or not seated properly after the mainboard replacement, the printer may incorrectly detect the ink cartridges as empty.

• Reseating the FFC (flat flexible cable) connected to CN15 is an important first step. Make sure there's no dust, corrosion, or bent contacts.

2. Overwrite Board (CSIC Board) Malfunction

Many Epson 1390 printers used for DTF, UV, or DTG modifications rely on a cartridge chip overwrite board (also known as a CSIC overwrite board). This board tells the printer that cartridges are full by auto-resetting the ink levels. If this board malfunctions, the printer will stay locked in an "ink out" state no matter what you do.

You can check or replace this component here: Epson R1390 Cartridge Chip - CSIC Overwrite Board for DTF, UV, and DTG Printers (Auto Reset Ink Level) (https://bchtechnologies.com/products/epson-r1390-cartridge-chip-csic-overwrite-board-for-dtf-uv-and-dtg-printers-auto-reset-ink-level).

3. Firmware and Initialization Problems

• Since you mentioned trying to install a firmware key without success, it's worth noting that if the overwrite board is malfunctioning, the firmware won't be able to initialize properly. The system expects to see "valid" cartridges before it allows firmware flashing or further setup.

• Fixing or replacing the CSIC overwrite board should allow the firmware update process to proceed normally.

4. Other Considerations

• Ensure that the cartridges (or dummy cartridges if you're using an alternate ink system) are seated firmly. Even with an overwrite board, poor cartridge contact can trigger errors.

• If the overwrite board is functional and CN15 is fine, but the error persists, the issue may still lie within the new mainboard. Transistor damage or incomplete repairs can sometimes carry over.

Addressing printer hardware and firmware issues like this can be complicated because they often require physical inspection and testing. That's why we aren't able to provide remote repair services. However, we do offer in-person evaluations and targeted repairs at our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). This service operates on a first-come, first-served basis, and depending on demand, there may be a wait of a few weeks before your printer or part can be checked. While our rates may not always be the most economical, we encourage exploring self-help solutions first. A great starting point is our YouTube channel (https://youtube.com/@bchtechnologies), where you can use the search icon next to "About" to locate tutorials on error codes, overwrite boards, and firmware setups. With nearly a decade of videos, this is often the quickest way to find solutions, and YouTube may also recommend other creators with helpful content.

Thank you again for your question and for your continued support of BCH Technologies. We hope this guidance helps you narrow down the cause of the ink-out error and get your Epson 1390 back in working order.