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Re: I need Know, How enter to service mode
Press,,,,, Menu #1934 . What you may want to try first is to do what is called the Shading adjustment. That calibrates the scanner. It would be found in the maintenance menu after you enter diagnostics. You must place 5 pieces of white paper on the glass before you perform the adjustment. There really is no way to increase the amount of toner concentration on that machine. You may very well have a defective ink cartridge. That is not uncommon on the C20. There is a metering blade in the toner cartridge that often times does not allow enough ink to be applied to the toner roller.
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Yeah the c20 is not sturdy at all. But that aside. Some things to do. 1, Unplug the machine, remove the back cover and on the right side you will see the main board.On the top portion of the board you will see a white ribbon cable. Unplug it and look at the silver contacts on the very end of that cable. Then reseat that cable. That may be the problem. More than likely though you have either a dirty mirror in the scanner. Which would require removing and cleaning the scanner thoroughly. The laser may also need cleaning. The toner cartridges for that machine leave a lot to be desired also. When you get a bad copy remove the toner, shake it from side to side and see if that fixes the problem temporarily. The blades that put the proper amount of ink on the toner roll fail often. The scanner failing would be my first thought. Also go to Xerox.com, select support and drivers, then enter C20 in the search box. Then go to drivers and downloads and install the newest firmware for the machine. You may have a machine software issue. I have worked on that machine since day one of its existence, I never did care for it. It is a cheap machine made by Sharp corporation for Xerox. It really isn't a Xerox product, they just stuck their sticker on it.
Open the cover and put a piece of paper on only half the glass, and make a copy. BLOCK the left side of the glass with the blank paper. See where it is blank. Most of the times that is a dirty or haved up mirror in the scan head. One of the small mirrors in the black assembly under the lamp. When a digital copier scanner optics become dirty, the image in that area becomes very light .
Have you simply tried shaking it front to back vigorously? If you have and I am assuming you did that. take it out, and on the top of the cartridge you will see a clear round window. Take either some black tape, or a small piece of paper and tape over it and see what happens. How that machine determines if there is or is not ink in the cartridge is by a sensor that looks throught that window for toner.
If you block it and it still says out of toner, then your sensor is bad.
Unplug the machine, open the right door. Get a phillips screwdriver. Look on the upper portion of the paper path, you will see an assembly with yellow waning stickers that say HOT. There are 4 silver screws on that fuser assembly. Remove those screws, and unplug the white connector. Pull back toward yourself to remove the fuser. Lay it down and remove 2 silver phillips screws , it will open up and you can remove the paper. Make sure the machine has been off for a half an hour or so, It is hot. Take a good look at the black aluminum coated roller on top. See if it looks smooth and clean, If it has a lot of toner built up on it, you will have to repalce the fuser or it will continue to jam and give you ghost ( light reprinted) images up and down your page. Also the M20 does not handle large black ares on a page such as a picture or magasing cover being copied. Largs solid areas tend to stick to that heat roller. If you do copy a photo, try and allow about 2 inches on the top of white. Just move your original down on the glass about 2 inches from the edge. 2 inches to tie right of the edge of the glass.
hello sir; you said this one is brand new, did you follow the installation instruction, no matter what, just di it again,
1, press "menu" ,
2, press up/down arrow keys until"new drum" display
3, press "mode/enter"
4, when you see"new drum unit?" press "1" to select "yes"
5, turn power off and on .