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there are three usual faults that cause this
1. the scanner is unable to locate home position- remove the scan glass/ clean and lubricate all rails
2. the ribbon cable has open circuit on tracks- replace the ribbon cable connecting the scanner to printer
3. the printer main PCA has failed and cannot control the scanner- replace main PCA
If you are unable to solve this problem using above mention solutions then you can try this one. Open all covers and then detach the DC controller board that is shown In picture below. it is the back side of DC controller board.
With this DC controller board you can see another small circuit bard that is attached with DC controller board with a white (ribbon) cable. I found two printers with this error when I examine the board I found that the thin print wires are broken as shown in the following picture. I have to connect these wires with soldering and now it is working fine.
If these printed wires are ok then you can check the ribbon cable .check all connectivity with Multimeter.
First you solve this problem with software.
Then try to find disconnected wires or dry soldering on circuit board.
Last you change the Dc controller board because the problem is in surly in DC controller board.
light should come on at power up. Found ribbon cable connecting scanner
unit to base had come unplugged from socket on circuit board. The
ribbon cable is one of three found near back hinge of scanner and is
hidden underneath the other two. It should drape over the edge of
circuit board and then plug into small recepticle on inner side of
board. I plugged it in and printer works again. Hope this helps.
The problem is most likely a broken plastic lever on the end of the
shaft that moves the print head. The plastic lever is keyed to the
shaft by a flat on the shaft. The plastic has a tendency to split at
the edge of the flat, resulting in the lever slipping on the shaft.
This in turn results in one side of the print head not contacting the
paper with sufficient pressure. The other end of the shaft has a thick
plastic sector gear which is much less likely to break.
mine by making a clamp from a metal spacer (made from split tube about
1/8 inch long) and force fitting it over the part of the plastic lever
that fits on the metal shaft (on the end towards the inside of the
unit). There is just enough clearance to do this without hitting the
print head frame.
To remove the plastic lever, first remove two
screws from back of unit, then pull up on top of unit, unplug two
ribbon cables from circuit board
and remove top. Then unplug two remaining ribbon cables from circuit
board, and three screws holding circuit board. Lift circuit board and
fan/fan-holder as one piece. Finally, disengage tab on plastic retainer
on end of metal shaft, rotate tab straight up and lift shaft up and to
the side (may require a little wiggling). The plastic lever slides off
the metal shaft.
Do all the other buttons function properly? If the numbers do not work etc then one of the other keys is stuck down, check them .
If only the start button is not working, then you have to remove the panel and check to see if it is broken or otherwise defective.
To remove the control panel, you have to remove the scanner. Here is how you accomplish that.
Open the front door as if you were changing toner or the drum. There are 2 silver phillips screws there, Remove those 2 screws.
Turn the maching around and remove the 6 screws holding on the back cover. Since this is a 412, you have to remove the back metal plate covering the main board, that is if I remember correctly 8 screws holding that metal cover on. remove the cover and set aside. Now look under the back edge of the scanner, there are 3 philips screws holding the back of the scanner it. Remove those screws. Then there is one ribbon cable connected to the upper part of the main board. Another plug just to the right of the white ribbon cable. Remove that, and also the green ground wire is screwed to the upper metal bracket. Remove the screw and the wire. to then remove the scanner from the back side of the machine, pull the scanner back and up to remove it. Then turn the scanner upside down and there are 3 screws holding the panel in, remove those screws and unsnap the pannel from the scanner, then remove the screws holding the circuit boards to the start assembly and check the switch.
In the back of the printer is an access panel with one screw to hold it in place.
The outer side edges are held in place with it plastic tabs (which you
can not see due to they are inside the printer. So carefully remove
this panel without breaking the tabs. Look inside and you will see a
ribbon connecting to a circuit board. This is probably loose or
disconnected. The end of the ribbon is hard and not flexible. Push the
end of this ribbon in the white plastic standoff slot. This ribbon
sometimes comes loose when the top scanner cover is partially remove
from the printer. I said, partially because if you needed to remove the
top scanner completely, then this ribbon would need to be completely
disconnected. You can also see, when the access panel is off, other
wire connections connected to this circuit panel. Sometimes they also
come loose or disconnect when the top scanner is partially remove.
Connect them if they are loose or disconnected. I believe to solve your
problem is the ribbon disconnected. Best wishes in solving your
That sounds more like the ribbon cable has some bad ends. remove the white ribbon cable from the board and see if some of the metal contacts are peeled back.
I have seen that problem a few times. The ends of that cable are not made to be taken out and in very many times.
Check ribbon cable connecting scanner unit to base, it may have come unplugged from socket on circuit board. POWER OFF the unit before you do any work on it.
The ribbon cable is one of three found near back hinge of scanner and is hidden underneath the other two. It should drape over the edge of circuit board and then plug into small recepticle on inner side of board.
Once reset, you can power the unit back on and it should work..
Normally that is an issue with the ribbon cable from the scanner to the main board if the latch is in the correct position.
I would securely reseat that cable, bias it somewhat upward.
Check the ends of that ribbon cable to be sure a portion of the silver print isnt pealed back.
No reset code for that. The scanner may have failed also. The sensor inside the scanner may be bad.
You can try going to the Xerox.com site under drivers and downloads and load the newest firmware. But I doubt that is an issue.
Only other thing i could think of would be the scanner not returning to the full home position due to an obstruction.
Or the scan head itself being out of the rail latch, or even the end of the scan head could be broken, not scanning straight.