Got a clog on photocyan only

[Smile]

Hi, I see that one of my printers IP6700D 6color has a clog on photocyan nozzles seen in nozzle test as thin line and if you print plain paper mode normal quality you can see it better.

Tried to clean by using distilled water and a syringe. Soaked the head in warm water 3-4 times until water became clear. Blowing water trough head pickup port 5 times.

Reinstalled in printer - same thing.

Repeated the process and reinstalled in printer - same thing.

I did not however use ammonia yet. Leaved the print head to soak in distilled water overnight.

Will try to blow ammonia tomorrow

Any ideas are welcome.

BTW ink that resulted in clog is OCP photo cyan ink, the rest are InkTec and works fine.

 

[headphonesman]

Any ideas are welcome.

Smile I have revisited this thread where we both contributed :-
http://www.nifty-stuff.com/forum/viewtopic.php?id=2798
and see that you must have tried everything discussed there.
The only further suggestions I could make are to use the vacuum principle only (head sat in small puddle of clean ammonia? ), in the hope the offending particles can be dislodged by the suction and return the way they came.
Should this still not do the trick perhaps head dismantling down to internal gasket level with a clean of the now available internal area and a repeat of the suction process after re-assembly might work.
Failing all of the above perhaps the Photo Cyan "firing mechanism" has become defective and its time for a head replacement ?, a great pity if thats the case.
Please advise how you finish up

 

[pharmacist]

Another possibility is that the OCP ink reacted with your Inktec ink to give some nasty and very fine precipitation very deep inside the print nozzles.

 

[ghwellsjr]

Have you tried my recommended procedure?

http://www.nifty-stuff.com/forum/viewtopic.php?pid=17971#p17971

 

[Smile]

It turned out that I cleared the photocyan with overnight soaking or blowing.

But now I see 1 black and 1 cyan nozzles cloged.

See atachments

service print http://rapidshare.com/files/153974229/nozzles_service_mode.jpg
normal nozzle test http://rapidshare.com/files/153974450/nozzles.jpg

I tried to blow with warm ammonia, does not work. If you look at images magnified it can be seem that cyan and black is misaligned ? They were fine before cleaning

 

[Smile]

Update

Is it some sort of weird luck or timing strip? Because I read that it is possible that timing strip to cause this. I decided to clean it.
While cleaning the black nozzles dried up somehow, it was not parket only for about a 1minute or so.

See attachment http://rapidshare.com/files/154268627/while_cleaning.jpg

Then after I ran normal head clean procedure with printer driver.

Wow black is OK? How come?

service print after cleaning timing strip http://rapidshare.com/files/154267063/nozzles_service_after_timing_strip.jpg

Cyan is still not firing with all nozzles, perhaps I should remove printer cover and clean the strip one more time because I cleaned it with cover on and it was hard task to clean it very good.

 

[Tin Ho]

It may be a purge unit problem. Is the pad dried up? I recently decided to bring a MP780 back to work after it's print head failed. I bought a new print head from Canon and installed it. After two cleaning cycles and two nozzles checks it printed absolutely nothing, not a single dot! I gave the pad of the purge unit a few drops of water then did another cleaning cycle. All in a sudden the nozzle check is printed perfectly. Check your purge unit. It may be too dry and lost the ability to prime the print head.

 

[Smile]

It may be a purge unit problem. Is the pad dried up? I recently decided to bring a MP780 back to work after it's print head failed. I bought a new print head from Canon and installed it. After two cleaning cycles and two nozzles checks it printed absolutely nothing, not a single dot! I gave the pad of the purge unit a few drops of water then did another cleaning cycle. All in a sudden the nozzle check is printed perfectly. Check your purge unit. It may be too dry and lost the ability to prime the print head.

The purge unit is fine as I use external bottle for the ink, I see ink flowing to the bottle when I run cleaning cycle etc. It's working OK

 

[Tin Ho]

So you are using a CIS. There is a possibility that one of your cartridges is leaking slightly. The leaked ink moves around and blocks off some other nozzles. The leaked ink forms a small pool of ink and moves around from the nozzles that leak. Depending on where the ink pool is formed different nozzles are blocked at different time. Usually all of the nozzles of a particular color are blocked at once because the ink pools along the slot where the nozzles are. Sometimes only one color gets blocked but some times more than one color. If you see different colors missing (or blocked) at different times this is really likely caused by leaking of ink from a cartridge. This is particularly likely because you are using a CIS. Usually a cleaning cycle will fix it but if the leak continues it will come back and you may see difference colors blocked. I have seen this on leaky cartridges, not CIS. If you used G&G cartridges (known to be leaky) you probably have seen all this already.

 

[Smile]

So you are using a CIS.

I do not use CIS because on canon printers it is very unstable as you know. Instead I use a few sets of OEM cartridges and rotate them I refill them in a vacuum. This way I can replace a cart when I need to.

I use ink collecting bottle because that way the waste ink is collected before it creeps inside the printer. The waste ink can also be used as I found out PGI black single use canon cartridges without any problems. So I get "real free" printing for my low end printer that prints documents only.