Epson L1800 or Procolored L1800 Won't Power On? Understanding Flashing Red Lights and Mainboard Issues

Question:
I watched your video about avoiding costly repairs by testing the Epson L1800 mainboard. Would the same testing approach apply to the Procolored Epson L1800 version (the teal-colored model)? My printer had the paper and ink lights flashing red. When I tried turning the front power button on so the printhead could move, the printer would not power on anymore. Now the unit doesn't power on at all.

Answer:

To answer your question: yes, the same diagnostic principles generally apply to the Procolored L1800 printers, including the teal version. These machines are typically built on the original Epson L1800 printer platform, but the manufacturer adds a separate DTF ink management system. Understanding how the system is structured helps explain why you may see certain symptoms.

Understanding the Two Major Systems in a DTF L1800 Printer

Most modified L1800 DTF printers consist of two main subsystems:

1. The Epson printer itself

   • Mainboard

   • power supply

   • carriage system

   • printhead electronics

   • sensors and control circuits

2. The external ink system

   • white ink circulation system

   • mixer or stirrer motor

   • white ink pump

   • sometimes a thermo heater or vacuum platen

   • independent control board and power supply

The main power switch at the back of the printer normally controls both systems, but internally they may still run on separate circuits.

Why the Ink System May Still Work When the Printer Doesn't

In many cases when a printer fails to power on, users notice that the ink system is still active. For example:

• the white ink mixer continues spinning

• the circulation pump runs normally

• heaters or vacuum tables remain powered

This happens because the ink system is powered separately from the printer's internal electronics. If the printer mainboard, internal power circuit, or fuse fails, the external ink system can still appear operational.

What the Flashing Red Lights Mean

Before the printer stopped powering on, you mentioned that the paper light and ink light were flashing red. On Epson L-series printers, this often indicates a general hardware error. Possible causes include:

• carriage obstruction

• encoder strip errors

• printhead electrical fault

• mainboard communication error

• waste ink counter overflow

• power circuit fault

However, once the printer stops powering on entirely, the problem typically shifts from a firmware error to a hardware power failure.

Common Causes When an L1800 Will Not Power On

If the printer now shows no response when pressing the power button, several components could be responsible.

1. Power Supply Failure

The internal power supply board may have failed. This can happen due to:

• voltage spikes

• short circuits

• aging capacitors

Symptoms include:

• no lights

• no movement

• completely unresponsive printer

2. Mainboard Damage

The mainboard (logic board) controls startup. If it becomes damaged, the printer may appear completely dead.

Possible reasons include:

• printhead short circuit

• damaged driver chips

• ink contamination

• electrical surge

This is why testing the mainboard-like demonstrated in the video-is helpful.

3. Printhead Short Circuit

A shorted printhead can prevent the printer from powering up. Epson boards are designed to protect themselves from head shorts, which sometimes results in the printer refusing to start.

Signs include:

• printer suddenly shutting down

• power button becoming non-responsive

• printer failing after a head cleaning or print job

Disconnecting the printhead temporarily during testing can sometimes help isolate this.

4. Internal Fuse or Power Circuit

Some Epson boards contain surface-mounted fuses or protection circuits. If these blow due to a surge or short circuit, the printer may lose power even though the external power adapter still works.

Does This Apply to Procolored Versions?

Yes. Most Procolored L1800 DTF printers still rely on the same Epson motherboard and internal electronics. The main difference is the added ink management system.

Because of this, the diagnostic approach shown in the video still applies:

• verify power supply voltage

• inspect mainboard components

• check for printhead shorts

• inspect fuses or burnt components

Addressing printer issues can be complicated because they often require physical inspection and hands-on testing. For that reason, we're not able to provide remote troubleshooting or step-by-step repair guidance. However, we do offer in-person evaluation and repair services through our diagnostic center at BCH Technologies Printer Repair Service (https://bchtechnologies.com/printer-repair-service). Due to high demand, repairs are handled on a first-come, first-served basis, and it may take several weeks before we can schedule a drop-off. Our repair services are designed to handle either complete printers or specific components, depending on your needs. That said, we understand our repair rates may not always be the most economical option. Therefore, we strongly encourage exploring self-help resources online. A great starting point is YouTube, including our channel homepage at BCH Technologies YouTube Channel (https://youtube.com/@bchtechnologies). Use the search icon next to the "About" section on the right side of the menu bar to find videos related to your specific issue. I receive dozens of requests every day asking whether a video exists for a particular problem. After creating videos for more than nine years, it's difficult to remember every single one, so using YouTube's search feature is the fastest way to locate helpful content. YouTube may also suggest useful videos from other creators that could guide you further.

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