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I would like to manually clean the black print head of MRC-845CW but do not know how to get it out. I tried cleaning more than 10 times but did not help. I also put new black ink cartridge.

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I am afraid that the method proposed by bzet1820 only works in printers where the print head is part of the ink cartridge.
On the MFC-845CW, the print head can only be exposed by disassembling the printer and this is not for the faint of heart! It can be done but the disassembly requires:
1) Remove the ink cartridges. Then fully remove the scanner bed (gently disengage the plastic blue arm that would normally hold the printer cover up when installing USB or Network cable.
2) Disconnect all visible connectors (wire and ribbon cables) by first lifting the plastic channels covers to expose the cables.
After all cable are disconected, with the printer cover at 90 degrees open, you can pull it backward and remove it.
3) Remove all visible screws to disconnect the external case from the main body of the printer.
The printer holds together also because of several hard to find plastic notches that click into place. You have to patiently probe and push/pull around the various edges to disengage the parts from each other.
4) After removing three holding screws, gently tilt the control panel forward and remove it. (There are some additional cables connecting the control panel to the rest of the circuitry and of course you need to disconnect those).
Mark or take pictures of the assemblies at various stages to facilitate reassembly.

5) Gently pull up the external case in its entirety to expose the entire printer body and the printer head. This requires some gentle persuasion especially on the two sides and the front of the printer.
6) With the print head visible on its two metal tracks, you have to ease out the rearmost track by forcing two spring clips out of the holding slots.
7) Once the rearmost track is free, gently ease out the print head mechanism from the front track and disengage the driving belt from the two pullies at each end. By twisting a bit the assembly (sill connected with ink tubes and ribbon cable) you will be finally be able to see the actual print head nozzles.
If you are lucky (!) some cleaning agent might be able to unclog the nozzles simply by rubbing with clean soaked fabric or qtips. If (as is most likely) you need more effective cleaning you wll have to remove the printer head completerly by unclipping a clip that holds the ink pipes to the printer head and a ribbon cable. These are under a black plastic cover that you will have to unclip with patient effort.
8) At this point, the head is free and you could soak the head in warm water / alchohol in a tray for a more energetic cleanup.
With a siringe, for my totally clogged magenta head, I tried to push air and alcohol through the magenta channel of the printer head but after reassembly I I found out that I was able to unclog only about 15% of the magenta nozzles. Subsequent cleanings in the printer did not unclog any further nozzles.
9) In reassembling the printer make sure that a little plastic white arm protruding through the rearmost metal track on the right hand side facing the printer, is actually exposed through a slot on the track (this determines when the printer head has reached the end of the run).
There is also a transparent ribbon that has to fit in between a vertical sensor on the printer head plastic cover. I think it senses the position of the printer head on its run.
If the above is not correctly done, after the printer is reassembled you will get an error such as "Unable to Clean - 50" or "Unable to Clean - 30" or something else and you will have to dismantle the whole printer again. Quite a pain....
Unfortunately, in my experience, if the head is heavily clogged it is unlikely that you will be able to free every single nozzle and restore full print quality. Anyway, if you like this type of challenge and don't mind actually getting your hands literally stained with ink, (as well as running the risk to end up with a totally unusable printer) I wish you good luck!!



Posted on Aug 01, 2010

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I assume that this one is multifunction brother mFc-845cw? if so, then please follow this procedure:

1. remove cartridge from craddle
2. check what is ink solvent, water, isopropyl alcohol or methylated spirit, solvent will be that which did not cause precipitation or curdling of the ink
3. touch bottom of the ink cartridge with lint free absorbent paper, if it leave print, this meant there is no problem with ink cartridge.
4. put one drop of solvent on gold button in the craddle adn allow to sink for about minute, touch with absorbent paper
5put a drop of solvent again on the nozzle in craddle, re-insert cartride and print test page. beginnig of the page will be rather faint but it should improve as page go to the bottom.

if this did not solved your problem, some office supply stores sell absorbent pads, weight is about 120 to 160, do not go for haevier than that as brother do not handle very well papers above 160 weight, try to print test page on that, whis will work as sort of cleaning tissue over the heads, do bear in mind that this cannot be run to often as it will wear heads very fast.

on all inkjet printers you need to print at least one page per week to prevent all nozzle from cogging and ink from drying.

hope this solve your problem, if not, please return but with more details on your printer.

Posted on Jul 30, 2010

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1 Answer

How do I clean the print heads of a MFG665CW


Hello there
Not being familiar with this particular model, I had a look at the users manual which can be downloaded in pdf (Acrobat Reader) format from the link below:
http://download.brother.com/welcome/doc002117/Mini3_MfcLcdW_UsaEngUsr_D.pdf
Here I found the instructions for cleaning the printhead using the control panel menus:-
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This is done from the control panel but I also managed to find the Service Manual (not on the Brother site!) here
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If you go towards the bottom of the page, there is a small link which says "Get download". Clicking on this downloads a pdf document to your browser which can then be saved to disk for future reference.
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Open the printer

Remove the ink cartridges from the print head.

Use cotton swabs dipped in hot water to thoroughly clean the print head.

Repeat this until there is no ink residue coming off on the cotton swab.

Once finished, allow to dry and replace the cartridges

Try to print something now

You can also use the manual for help.

http://welcome.solutions.brother.com/BSC/public/files/dlf/doc002117/Mini3_MfcLcdW_UsaEngUsr_D.pdf

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Hi

Clean it manually by removing the black ink cartridge and rub the print head into a paper with rubbing alcohol until ink flows more. Then run the print nozzle to clean the print head thoroughly. After, try to print again.

If not, dip the print head only into hot water for 5 minutes and then run the print nozzle.

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1. open the top lid to have the cartridges that are inserted in the print head to the middle of the printer.
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