Question about Brother MFC-640CW All-In-One InkJet Printer
Not long after we got the MFC-640CW, a plant-watering overflow resulted in water on the control panel of the unit. Most of the buttons haven't worked since then. We still used it on occasion via software control but would really like to make it fully functional again.
I have taken apart plenty of gear and cleaned/fixed little carbon-button/membrane switches, so that part I'm OK with. I just can't figure out how to take this thing apart so I can get at the dirty bits.
How do I take this thing apart?
Figured it out. There are three screws under the lid. One of them is tough to get at, but if you remove the lid support and the phone rest the lid will open to 90 degrees. At that point the top just pulls away from the base unit. You may have to unsnap the small cover where the wires pass from the base to the top unit so you can pull enough slack in the wires to pull the top off the hinges. Once that's done removing the last screw is easy.
After the screws are out, prying around the edges of the panel unsnaps the remaining retainers and pops it right off.
The problem in our unit ended up being corrosion in the circuit area of the board. I cleaned up the corrosion and found one trace that was broken. I soldered a jumper around the broken trace. The broken trace was preventing 4 of the buttons from functioning. Once the jumper was in place all the buttons started working.
Back in business.
Posted on Jul 22, 2008
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Posted on Jan 02, 2017
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