Epson ET-16600 Missing Cyan After Printhead Cleaning: Causes, Risks, and What to Check Next

Question

I have an Epson ET-16600 that was converted for sublimation printing. I started having broken lines in the cyan and magenta sections of my nozzle checks, and normal cleaning did not seem to correct the problem.

Before finding BCH Technologies' videos, I tried several things:

1. I removed the dampers and used a syringe to pull ink through the bottom openings.

2. When that did not improve the nozzle check enough, I pulled ink through the ink tubes separately.

3. I then pushed approximately 10 mL of printhead cleaning solution through the cyan and magenta printhead ports underneath the dampers, with a paper towel under the printhead.

4. After doing this, the nozzle check became much worse. The lower-right portion of the cyan pattern is now completely missing.

Since then, I have pulled more ink through the cyan and magenta dampers and tubes, but the nozzle check has not improved. I have also performed three Power Cleaning cycles, although they were not done back-to-back. I let the printer sit overnight and performed another nozzle check, but the cyan is still missing.

The printer has not been used heavily. It has printed fewer than 700 pages, and a large percentage of those pages have actually been nozzle checks while I was trying to solve this problem. I have also tried to prevent clogging by performing nozzle checks about twice a week.

Is it possible that pushing the cleaning solution through the printhead damaged the printer? Is the printhead ruined, or could the problem still be related to the dampers or ink-delivery system? Also, do you sell replacement dampers for the Epson ET-16600?

Answer

First, regarding replacement dampers, unfortunately, we do not currently carry parts specifically for the Epson ET-16600, including replacement dampers for this model.

Regarding the missing cyan, I would not immediately conclude that the entire printer is ruined. However, the fact that a portion of the cyan nozzle pattern disappeared completely immediately after cleaning solution was manually pushed through the printhead is an important clue.

Manually Pushing Cleaning Fluid Through an Epson Printhead Can Be Risky

Epson printheads use piezoelectric technology and contain extremely small internal ink channels, chambers, membranes, filters, and nozzle structures. These components are designed to operate with very small and carefully controlled pressure differences.

When cleaning solution is pushed manually through a printhead with a syringe, it is very difficult to know how much pressure is actually being applied. Ten milliliters may not sound like very much liquid, but the volume itself is not the most important issue. The pressure used to force that liquid through the microscopic passages is what can create problems.

If too much positive pressure is applied, several things are possible.

One possibility is that accumulated material inside the ink channel was moved deeper into the printhead instead of being removed. A partial clog can therefore become a more serious blockage.

Another possibility is that cleaning solution displaced the ink and introduced a significant amount of air into the cyan channel. Epson ink systems are very sensitive to air. A channel containing a large air pocket may fail to prime properly even though ink appears to be present in the tubing or damper.

A more serious possibility is physical damage inside the printhead. Excessive syringe pressure can potentially damage internal seals, membranes, channel structures, or the bonding between different layers of the printhead. Once internal separation or leakage occurs, normal cleaning cycles generally cannot repair it.

This is one reason we normally discourage aggressively forcing cleaning solution through an Epson printhead.

The Timing of the Cyan Failure Is Significant

Before the manual flushing, you were seeing broken cyan and magenta lines. That normally means that at least some of the affected nozzles were still functioning.

After pushing cleaning solution through the cyan and magenta ports, you reported that an entire section of the cyan pattern disappeared.

That change is important.

If the same cyan area remains completely blank through multiple nozzle checks, cleaning cycles, an overnight rest period, and subsequent attempts to prime the ink system, then the problem may no longer be a simple dried-ink clog.

There are several possibilities to consider.

1. Air May Be Trapped in the Cyan Ink Channel

Because the dampers, tubing, and printhead connections were disconnected and manipulated several times, air may have entered the cyan ink-delivery path.

Pulling ink successfully into a syringe does not necessarily prove that the entire system is operating correctly. Ink may travel through the tubing while a bubble remains somewhere between the damper and the printhead.

The printer's normal pumping system must be able to establish the correct negative pressure through the printhead. If the cyan channel cannot maintain that pressure, some or all of the cyan nozzles may remain empty.

This can sometimes produce a nozzle check where one portion of a color prints normally while another portion is completely absent.

2. The Cyan Damper Could Be Involved

A damper does more than simply hold ink. It also helps regulate ink pressure and normally contains a filtering structure.

A damper can become partially restricted, contaminated, air-filled, or mechanically damaged.

Because you have already removed and manipulated the dampers, it is worth considering whether the cyan damper is still sealing correctly against the printhead manifold. A damaged seal, O-ring, connection point, or damper membrane can allow air to enter even when ink can be manually pulled through the system.

However, replacing a damper would only help if the problem is actually upstream of the printhead.

If the same group of cyan nozzles remains consistently absent while the ink supply to the printhead appears stable, the likelihood of an internal printhead problem becomes greater.

3. The Cleaning Solution May Have Loosened Material Inside the Printhead

Cleaning solution can sometimes dissolve or soften dried pigment or dye deposits, but dissolved material still has to leave the printhead.

If a strong flow suddenly moves contamination through the internal passages, loosened material can sometimes collect in another narrow area.

In that situation, a relatively minor nozzle obstruction can turn into a larger channel restriction.

This is one reason a nozzle check can occasionally look worse immediately after aggressive flushing.

4. There Could Be Internal Printhead Damage

Unfortunately, this possibility cannot be ruled out.

If excessive pressure was applied while pushing the cleaning solution through the printhead inlet, an internal cyan channel could have been damaged.

Some Epson heads contain groups of nozzles that share portions of the internal ink-delivery structure. Therefore, losing a distinct section of one color rather than having randomly scattered missing nozzles can sometimes indicate a problem deeper inside the printhead.

If an internal channel, membrane, seal, or laminated section of the head has been damaged, repeated cleaning will not restore it.

This does not necessarily mean the entire printer is worthless, but printhead replacement on a machine of this size can become expensive enough that the economics of the repair need to be considered.

5. The Capping Station and Pump Should Not Be Ignored

Another component involved in nozzle recovery is the maintenance or capping system underneath the printhead.

During a cleaning cycle, the printhead parks over the cap. The pump creates suction through that cap to draw ink through the nozzles.

If the cap does not seal correctly against the printhead, or if the pump, waste tubing, or cap is restricted, cleaning cycles may fail to prime the head correctly.

Normally, a capping-station problem tends to affect multiple colors rather than a very specific portion of cyan. However, because the printer has been through extensive cleaning attempts, it is still something that should be considered before condemning the printhead.

Be Careful With Additional Power Cleaning Cycles

At this point, I would be cautious about repeatedly performing Power Cleaning.

A Power Cleaning consumes a substantial amount of ink and sends that ink through the maintenance system. Performing additional Power Cleanings without seeing meaningful improvement can quickly consume ink and fill the maintenance box or waste-ink system without solving the original problem.

More cleaning is not always better.

If a nozzle-check pattern improves slightly after each cleaning, additional controlled cleaning may sometimes make sense. If exactly the same cyan section remains completely blank every time, however, repeatedly running increasingly aggressive cleaning cycles usually provides diminishing returns.

Sublimation Ink Adds Another Variable

Because this ET-16600 has been converted to sublimation ink, the ink itself also needs to be considered.

Sublimation inks can behave differently from Epson's original ink, particularly regarding particle size, viscosity, surface tension, settling, and drying characteristics.

Even if the printer is exercised regularly, repeatedly printing nozzle checks does not necessarily move enough ink through every channel to prevent sedimentation or flow problems.

There can also be compatibility issues between third-party ink and third-party cleaning solution. A cleaning solution that worked successfully with a cartridge printer in the past is not necessarily appropriate for every Epson printhead, ink formulation, or sublimation setup.

Different cleaning fluids use different solvents and surfactants. Mixing an unknown cleaning chemistry with a sublimation ink can occasionally produce precipitation, residue, or other unexpected behavior.

I cannot say that happened here, but it is one of the possibilities that should be kept in mind.

What I Would Avoid Doing Now

At this stage, I would not continue pushing cleaning solution through the cyan printhead port with positive syringe pressure.

If the head is simply airlocked or partially restricted, more pressure can make the situation worse. If internal damage has already occurred, additional pressure will not repair it and could potentially damage another section.

I would also avoid repeatedly removing and reinstalling the dampers unless there is a specific reason to do so. Every time an ink connection is opened, there is another opportunity for air to enter or for a seal to become damaged or improperly seated.

Is the Printer Definitely Ruined?

No, I would not say that based solely on the nozzle check.

The printer could still have an ink-delivery, damper, air, or maintenance-system problem.

However, because the dramatic loss of cyan occurred directly after pressurized manual flushing, internal printhead damage has to be considered a realistic possibility.

The pattern of the failure is particularly important. Random missing cyan nozzles that gradually move around between nozzle checks tend to point more toward clogging, air, or unstable ink delivery.

A large, sharply defined section that remains completely absent in exactly the same location is more concerning for a channel-level restriction or physical problem inside the printhead.

Therefore, I would not sell the printer for parts immediately, but I also would not keep performing aggressive cleaning procedures hoping that one of them will suddenly restore the cyan.

The next logical stage would be determining whether cyan ink is being supplied reliably to the head and whether the maintenance system is capable of correctly priming the head. If those systems are functioning properly and the identical cyan section continues to remain completely missing, then suspicion increasingly shifts toward the printhead itself.

Addressing printer problems can be complicated because so much of the diagnosis depends on physically observing the machine, ink flow, seals, pumps, and printhead behavior. For that reason, we're unable to provide individualized remote troubleshooting, repair instructions, or ongoing technical support for printer repairs.

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]. Because demand for this service is high, repairs are handled on a first-come, first-served basis, and it may take several weeks before a printer can be scheduled for drop-off. Our service options are designed to accommodate either an entire printer or, where appropriate, specific components, with instructions provided on how to proceed.

We also recognize that professional printer repair is not always the most economical solution. For that reason, we strongly encourage customers who are comfortable working on their own equipment to continue researching the problem independently. YouTube is an excellent starting point, including the homepage of our BCH Technologies YouTube channel [https://youtube.com/@bchtechnologies].

On our channel, you can use the search icon located near the "About" section on the right side of the channel menu to search for terms such as "Epson printhead," "damper," "air in ink line," "capping station," "nozzle clog," or similar topics. I receive dozens of questions every day asking whether we have a video covering a particular problem. After creating repair videos for more than nine years, it has become difficult for me to remember every video we have produced. Using YouTube's channel search is usually the fastest way to locate relevant material, and YouTube may also recommend useful repair videos from other creators.

Thank you again for contacting BCH Technologies, for taking the time to explain everything you have already tried, and for supporting our YouTube channel. I know how frustrating it is when an attempt to correct a relatively small nozzle problem suddenly results in a much larger missing section. I hope this explanation gives you a clearer understanding of what may have happened and helps you make a more informed decision about whether further diagnosis or repair of the ET-16600 is worthwhile.