Procolored DTF Printer Won't Fully Power On After Motherboard Replacement: F1 Fuse, Power Supply, and Startup Problems

Question

I have a Procolored DTF printer and recently installed a secondhand replacement motherboard. The printer initially worked normally, but when I tried to run a test print, it suddenly shut off. Now, when I turn the machine on, the printer itself does not fully start and the power light does not illuminate. However, the ink temperature system is still on, and the white ink stirring system continues to operate.

I also noticed that the green indicator on the power supply is now blinking.

When I reconnect my original motherboard, the printer does power on and can eventually print, but the startup is abnormal. It can take approximately 20 minutes before it becomes ready, and during startup it seems to think that it is already printing.

Previously, I also had an electrical problem that blew the F1 fuse. Could the blown F1 fuse, motherboard, or power supply be causing these startup problems?

Answer

The Printer and the DTF Ink System May Be Receiving Power Separately

The first important point is that a converted or purpose-built DTF machine is not necessarily one single electrical system.

You can generally think of the machine as having two major sections:

• The printer mechanism and its main electronics

• The auxiliary DTF ink and heating systems

The auxiliary system may include the white ink stirring motor, white ink circulation pump, ink temperature controller, heater, vacuum platform, or other accessories, depending on the exact Procolored model.

Although the master power switch may supply power to the entire machine, these systems can operate through different boards and different power circuits.

This is why seeing the white ink stirrer operating and the temperature display illuminated does not necessarily mean that the printer's mainboard is successfully starting.

Procolored itself describes its printer motherboard as the central controller responsible for coordinating the printer's major functions, while some Procolored models use a separate multifunction board to control components such as the circulation pump, stirring motor, and temperature controller.

Therefore, your observation actually makes sense: the DTF ink system may still be receiving power while the printer section has failed to complete its startup sequence.

Why the Replacement Motherboard Worked Until You Started a Test Print

The fact that the replacement motherboard powered the printer normally at first but shut down when you commanded a test print is an important clue.

During basic startup, the motherboard may only be powering its logic circuitry and performing relatively light initialization. Once printing begins, additional circuits become active. Depending on the printer platform, this can include the printhead drive circuitry, carriage motor, paper-feed motor, pump system, and other loads.

Therefore, if the printer shuts down specifically when printing starts, I would be suspicious of an electrical problem that appears only when one of these higher-load circuits is activated.

Possibilities include a problem with the replacement motherboard itself, a shorted printhead or printhead cable, damaged FFC contacts, a carriage or feed motor problem, an unstable power supply, or another component pulling one of the printer's voltage rails down.

A secondhand motherboard can also already have weakened or damaged circuitry even if it appears functional during initial power-up.

The Blinking Green Light on the Power Supply Is Important

The blinking green indicator on the power supply deserves attention.

I would not assign a definite error meaning to the blinking light without knowing the exact power supply model, because indicator behavior can differ between versions.

However, a switching power supply may cycle or enter protection when it detects an excessive load, short circuit, unstable output, or another abnormal electrical condition.

Procolored notes that its printer power systems supply different voltage rails to various components and that some of its switching power supplies incorporate overload and short-circuit protection.

Therefore, a power supply indicator that behaved normally before the motherboard problem but now blinks after the shutdown could potentially indicate that the supply is repeatedly attempting to start and then protecting itself.

That does not automatically mean the power supply itself is defective. Something connected to the power supply could be pulling the voltage down.

Could the F1 Fuse Cause This Problem?

Yes, the F1 fuse is definitely relevant, but there is an important distinction.

A fuse normally does not fail for no reason. If the F1 fuse blew, there was probably excessive current somewhere in the circuit it protects.

Depending on the motherboard platform used in your Procolored printer, the F1 fuse may protect part of the printhead power circuitry or another important power rail.

If that fuse is open, certain sections of the board may no longer receive their required voltage. This can result in unusual symptoms such as incomplete initialization, failure of the printhead circuit, abnormal startup behavior, or a printer that appears partially functional.

However, I would not assume that replacing the F1 fuse alone solves the problem.

The more important question is:

Why did F1 blow in the first place?

For example, an F1 fuse can blow because of a shorted printhead, damaged FFC cable, contaminated connector, incorrect cable installation, liquid or ink contamination, damaged transistor or MOSFET circuitry, or another short downstream of the fuse.

If the underlying short remains present and a new fuse is installed, the replacement fuse may simply blow again. In some cases, further motherboard damage can also occur.

The Printhead and FFC Cables Should Be Considered

Because the replacement board apparently failed when a test print was initiated, I would pay particular attention to the printhead circuit.

The printhead requires significantly different electrical activity once the machine actually begins firing nozzles.

A damaged printhead, incorrectly installed FFC cable, partially inserted cable, burned contact, contaminated connector, or cable installed at an angle can potentially create a short when the printhead drive circuitry becomes active.

This is especially important if the printer previously experienced an F1 fuse failure.

If there has ever been ink, cleaning solution, or moisture around the printhead connectors, the printer should not simply be powered repeatedly in hopes that it will recover. A contaminated printhead circuit can damage both the printhead and motherboard.

Why Does the Original Motherboard Take 20 Minutes to Start?

The behavior of your original motherboard is a separate clue.

You mentioned that the printer eventually powers up and prints with the old motherboard, but startup can take approximately 20 minutes and it initially behaves as though it is already printing.

That is not normal startup behavior.

There are several possible categories of causes.

One possibility is a communication or print-queue problem. If the computer, RIP software, or Windows print spooler is repeatedly sending an old job, the printer may appear to enter a printing state immediately after initialization.

As a basic distinction, you can observe whether the behavior remains when the printer is started without the USB connection to the computer. If the abnormal "printing" condition disappears when disconnected, the problem may be related to the computer, RIP software, print queue, or USB communication rather than the printer electronics alone.

If the same behavior occurs completely disconnected from the computer, then I would be more suspicious of the printer's initialization process.

A Mechanical Initialization Problem Can Also Delay Startup

The motherboard must verify several mechanical conditions before the printer becomes ready.

Depending on the underlying Epson platform used in the Procolored machine, startup can involve the carriage position, carriage encoder, paper-feed mechanism, pump or capping station position, sensors, and other initialization routines.

If one of these systems is moving improperly or providing an inconsistent signal, the motherboard may spend an unusually long time attempting to initialize.

This would be different from an F1 fuse problem, although multiple problems can certainly exist in the same machine.

For example, your original motherboard may have survived the original electrical event but sustained partial damage. Alternatively, the motherboard may be fine while another component connected to it is intermittently causing the abnormal startup.

The Replacement Motherboard May Have Been Damaged by the Existing Printer Fault

One possibility that should not be overlooked is that the replacement motherboard was not the original cause.

The printer itself may already contain the electrical fault that damaged the first board or blew the original F1 fuse.

You then installed another motherboard. It powered on because the problematic circuit had not yet been heavily activated. Once you commanded a test print, the affected circuit became active and the second motherboard shut down.

That sequence would be consistent with a downstream electrical problem.

In other words, if two motherboards show problems in the same printer, I would become increasingly suspicious of something connected to the motherboard rather than assuming that both motherboards independently failed.

Do Not Continue Swapping Boards Repeatedly

I would be careful about repeatedly switching between the original motherboard and the replacement motherboard.

If there is a short somewhere in the printhead circuit, cable system, motor circuit, or another connected component, repeatedly installing good boards can damage additional boards.

Likewise, repeatedly replacing the F1 fuse without identifying why it failed is risky.

A fuse is a protective component. When it opens, it is often protecting more expensive circuitry from an electrical problem farther downstream.

The Power Supply Should Also Remain on the Suspect List

Because you specifically mentioned the power supply's green indicator now blinking, the power supply should not be ignored.

Procolored power boards can provide several DC outputs for different printer functions, depending on the model.

A power supply can sometimes appear functional under a light load but become unstable once the carriage, printhead, or motors begin drawing more current.

Therefore, there are two general possibilities:

The power supply itself may be unstable, or a component connected to the power supply may be causing it to enter protection.

Those two situations can look very similar from the outside.

The Startup Button and Control Circuit Are Another Possibility

Some Procolored machines also use a dedicated startup button board that sends the activation signal to the mainboard. Procolored describes this board as part of the circuit responsible for initiating the printer's startup sequence.

Since your power indicator is not behaving normally with the replacement motherboard, this circuit could theoretically be involved as well. However, because the failure happened immediately after starting a test print, I would consider the power, mainboard, printhead, and associated load circuits more significant clues than the button alone.

What the Symptoms Suggest Overall

Based on the sequence you described, I would not treat this as simply an ink-system problem.

The white ink stirring and temperature systems continuing to operate only tells us that those auxiliary DTF circuits are receiving power.

The important symptoms are:

• The replacement motherboard initially operated normally.

• The printer shut down when a test print was started.

• The printer section no longer completes startup with that board.

• The auxiliary ink system still operates.

• The power-supply indicator is now blinking.

• The original motherboard can still eventually start.

• The original motherboard has an abnormal, very long initialization.

• The machine previously experienced a blown F1 fuse.

Taken together, these symptoms make an electrical or initialization problem much more likely than a simple software setting.

The F1 fuse could absolutely be part of the problem, but I would consider it evidence of a deeper electrical fault rather than automatically identifying the fuse itself as the original cause.

Extra caution is appropriate around the power supply. Printer power supplies contain hazardous mains voltage even though many of the outputs going to the printer are low-voltage DC. Unless you are qualified to diagnose switching power supplies, avoid opening or probing the high-voltage section. Disconnect AC power before connecting or disconnecting motherboard, printhead, motor, or FFC connections.

Addressing printer issues like this can be complicated because diagnosis usually requires hands-on inspection and electrical testing of the actual machine. For that reason, we're not able to provide ongoing remote troubleshooting, repair instructions, or individualized repair support. We do offer an in-person evaluation and repair service through our BCH Technologies printer diagnostic and repair facility [https://bchtechnologies.com/printer-repair-service]. Due to high demand, service is handled on a first-come, first-served basis, and there may be a waiting period of several weeks before a printer can be dropped off. Our services are structured for either whole-printer repair or certain individual components, with instructions provided for how to proceed. We also understand that professional repair is not always the most economical option, so we strongly encourage self-help research when appropriate. A good place to begin is YouTube or the BCH Technologies YouTube channel [https://youtube.com/@bchtechnologies]. On our channel homepage, use the search icon near the "About" section to search terms such as your printer model, F1 fuse, motherboard, no power, printhead short, power supply, or the specific symptom. We receive dozens of questions every day asking whether we have a video covering a particular issue, and after producing repair videos for more than nine years, it is difficult to remember every video individually. YouTube's channel search is usually the fastest way to locate one, and YouTube may also recommend useful repair information from other creators.

Thank you again for contacting BCH Technologies and for taking the time to explain the symptoms so thoroughly. I hope this gives you a clearer understanding of why the printer's ink system can continue operating even when the printer itself does not start, and why the previous F1 fuse failure is an important clue when evaluating the motherboard and power system.