Question about Head Office Equipment & Supplies
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Posted on Jan 02, 2017
I'm afraid there is no real sucessful way of cleaning these print heads, tiny micro filters built into the head unit will blocked. I have never unblocked one fully.
Fix is to replace head
These heads are not easy to fit, then once they are you must program in the head id and run a purge with four gen inks, this purge uses like 1/4 of each ink.
Recommennd you replace printer it is cheaper to
LINK to UNRECOMENDED removal of head
I dont have the 420 cn listed but here is link to mfc425cn head info so you can see how much they are not worth buying
below is pic of head
Posted on Jan 13, 2008
Try doing nozzle cleaning, hope fully this flushes the air bubbles trapped in the cartridges. Or try using this template which sometimes flushes out the inks.
Posted on Aug 01, 2008
Replacing the print head
The print head may need replacing if, after all print head and ink tank troubleshooting has been performed:
Posted on Dec 02, 2008
You have the classic single nozzle failure it appears. You say you have done a nozzle check. This should reveal that one of the black nozzles is not working i.e. there is a single gap in your nozzle check printout for the black nozzles. Now, this may be due to a blocked nozzle. Try the following print head soak process.
Turn the printer on, and as soon as the print head moves pull the power cord out of the back, or turn the printer off at the mains. You may now carefully move the print head by hand over to the left hand side out of the way. Look inside the print head parking area on the right and you will see a small rubber cup that comes up to cover the print nozzles when the head is parked (to stop it drying out). Use a syringe or dropper to fill this cup with head cleaning fluid or distilled water. DO NOT USE TAP WATER. Carefully push the print head fully into its parking position so that the cup full of fluid comes up over the print head. Leave this for at least 24 hours, then try a head clean again. If still nothing, report back
Posted on Feb 01, 2009
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