Canon i850 tank cross contamination - after heads parked

[Roy Thomas]

Canon i850 tank cross contamination - after heads parked

I've see this before on a ng and its believed that its caused by the
suction hoses connecting the pumps to the nozzle docking "pads" has
got clogged or degraded and is not working to suck away ink pushed out
from the printhead during any cleaning routine/cycle. Hence mixing of
colours. This wasted ink should end up in the sump.

Its been said replace the ink suction hoses - I've got the printer's
cover off (the easy bit) but can't see how to gain access to under the
nozzle docking section - does anyone know how to get to this? Does the
whole of this part, with suction pump, come out as one complete
section. In the case of my printer the waste ink does seem to pond in
the nozzle docking pad trays.

I assume this is similar on some other Canon printers.

Thanks.
Roy Thomas <roytomeclipse**NOSPAM**@yahoo.co.uk>

 

[Ron P]

Canon i850 tank cross contamination - after heads parked

I've see this before on a ng and its believed that its caused by the
suction hoses connecting the pumps to the nozzle docking "pads" has
got clogged or degraded and is not working to suck away ink pushed out
from the printhead during any cleaning routine/cycle. Hence mixing of
colours. This wasted ink should end up in the sump.

Its been said replace the ink suction hoses - I've got the printer's
cover off (the easy bit) but can't see how to gain access to under the
nozzle docking section - does anyone know how to get to this? Does the
whole of this part, with suction pump, come out as one complete
section. In the case of my printer the waste ink does seem to pond in
the nozzle docking pad trays.

I assume this is similar on some other Canon printers.

Thanks.
Roy Thomas <roytomeclipse**NOSPAM**@yahoo.co.uk>

I used to have the same printer and had the same problem. The solution from
Canon was to remove the offending tanks and clean around the mount where the
tanks are installed with alcohol and replace the tanks as there is no saving
them. It worked and the problem never returned.

 

[Roy Thomas]

Well I dismantled the printer so I could get to the waste ink suction
pipes and on testing they seemed fine - no leaks. Also there is plenty
of suction from the head docking trays as I tested these while the
printer was in use again by adding distilled water - which was
immediately sucked out to the waste area (out of interest I never
realised just how much ink gets dumped down there). ie. I assume there
is no ponding of ink for the heads to be bathed in.

In my case the yellow printing at the start of each page gets green in
it and this affects the red. It never affects the cyan or black. It
happens far less with repeated pages of printing.

Did Canon just tell you to clean the print head rubber sealing around
the bit that engages with the outlet wick at the base of the
cartridge?

In my case the ink is definitely cross leaching - once the printer was
left unused for a very long time the yellow cartridge ink all turned
green.

Could cross contamination be happening inside the print head itself?

Regards, Roy

 

[measekite]

I think that Canon's instructions was for the use of their ink. This
usually does not happen with Canon ink unless you are nearing the end of
the wear cycle.

 

[Tony]

Well I dismantled the printer so I could get to the waste ink suction
pipes and on testing they seemed fine - no leaks. Also there is plenty
of suction from the head docking trays as I tested these while the
printer was in use again by adding distilled water - which was
immediately sucked out to the waste area (out of interest I never
realised just how much ink gets dumped down there). ie. I assume there
is no ponding of ink for the heads to be bathed in.

In my case the yellow printing at the start of each page gets green in
it and this affects the red. It never affects the cyan or black. It
happens far less with repeated pages of printing.

Did Canon just tell you to clean the print head rubber sealing around
the bit that engages with the outlet wick at the base of the
cartridge?

In my case the ink is definitely cross leaching - once the printer was
left unused for a very long time the yellow cartridge ink all turned
green.

Could cross contamination be happening inside the print head itself?

Regards, Roy

I have seen this more than once and only with Canon printers (various models).
I think Canon's advice was good and it seems to fix the problem.
BTW it happens with OEM and compatible tanks.
Tony

 

[Olin K. McDaniel]

I have seen this more than once and only with Canon printers (various models).
I think Canon's advice was good and it seems to fix the problem.
BTW it happens with OEM and compatible tanks.
Tony

Tony,
I had the same problem with 2 older HP printers, the 722 and the
Photosmart P-1000. Don't say it only happens with Canon printers, in
fact it has not yet happened with my Canon i950 in over 3 years.

Olin

 

[Tony]

Tony,
I had the same problem with 2 older HP printers, the 722 and the
Photosmart P-1000. Don't say it only happens with Canon printers, in
fact it has not yet happened with my Canon i950 in over 3 years.

Olin

Olin
I am sure it happens with other makes but I have never seen it with a printer
that has non-integrated heads other than the current line of Canon printers.
The colour cartridges in the Deskjet 722 and the Photosmart P1000 have heads in
cartridges (integrated) and they can cross contaminate but usually with
refilled cartridges.
I can only speak from personal experience and I certainly did not imply it only
hapens with Canons. I have yet to see this with an Epson or Brother inkjet.
Tony

 

[Ron P]

Olin
I am sure it happens with other makes but I have never seen it with a
printer
that has non-integrated heads other than the current line of Canon
printers.
The colour cartridges in the Deskjet 722 and the Photosmart P1000 have
heads in
cartridges (integrated) and they can cross contaminate but usually with
refilled cartridges.
I can only speak from personal experience and I certainly did not imply it
only
hapens with Canons. I have yet to see this with an Epson or Brother
inkjet.
Tony

The two time that it has happened to me was after doing a head alignment.
The models concerned were a i850 and an IP4200.

The problem with the IP4200 seems to be correcting itself as the green
overcast that I have to my prints is getting fainter with every print.