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there is a button on the front pannel. change ink. press it. open the front pannel. take cartride out and put new one in. close front panel. printer will ask if it is a new or old cartridge. 1 for new 2 for old.
Roll the window down first, you will need 2 hands. Pull the small cover off that is at the top front of the door pannel. You will then disconnect the wire connector and remove the three 11mm nuts that are holding the mirror in place. Pull mirror out and replace.
If you dont have just that little pannel you will have to remove the door pannel. If you dont have power windows pull the cover out on the window crank and move it to the side, there will be a screw holding the crank in place. Remove it. If you do have power windows remove the window control switch plate (it will just pop up using a small screwdriver) and disconnect the wires. If equipped, remove the front door trim panel reflector or the courtesy lamp lens. Then remove the screws. DO NOT pull directly outward on the door pannel, something will brake. Remove the front door trim panel by pulling it straight upward.Lift and remove the front door trim panel. Then the nuts holding the mirror will be visible, remove and replace the mirror.
Drain pump screen is clogged. If its makeing a bad grinding sound the pump will need to be replaced. Otherwise disasembly of the machine is required to access pump area to clean out screen. Dextrous people can probaly do this from the back or underneath unit. Its difficult and I don't recomend it to beginers or people who arn't handy. Easiest/prefered method: (This is the one I use.)
Method A units that have a bottom access panel. ie: front panel not one seamless peice.
-lean back against wall for easy access.
-remove two #2 square screws form access panel.
-Loosen clamp holding hose to tub. (Big black one around 2" in diameter.)
-remove and clean screen.
-reassemble machine and test pump operation.
Method B units the have seamless front panel.
-remove top. 3 screws @ back, slide top away from machine to remove.
-remove 2 screws holding console onto chasis.
-remove 3 screws @ and behind disp area.
-Remove console. ( tab may be holding to front panel @ middle bottom use putty knife to pry up.)
-remove 4 screws holding front pannel @ top to chasis.
-remove 2 screws holding frong pannel to chasis inside machine. Acess from top. (some models only.)
-remove bottom screws either 4 or 2 usally 4.
-remove two screws holding door lock to front panel
-remove spring from around bellow.
-remove bellow from front pannel
-remove front pannel. Tilts forward and lifts up off supports. (some models only.) or pannel ifs up and off from white tabs in side of chasis.
-unhook wires to door lock from front pannel. (plastic molex tab)
-may now access pump like in method A.
-access pump area
-remove drain hose to pump by looseing clamp and pulling off.
-remove hose to tub by losseing clamp and pulling off.
-remove power connection at back left of pump.
-unscrew two philips screws holding pump too base plate. (only one is really required.)
-clean pump screen or add one if not present.
-replug in power
-test pump operation
This is the BIOS telling you that the case or panel on your system had been removed for some reason. Is the front panel snug? Was it removed for some reason? You may have to go into the setup and clear the message.
I am not familiar with this machine but most dryers have to have the front removed so that you can slip the belt over the drum. I would imagine they have the screws hidden pretty well. Perhaps their is a removable front panel. Some have a few screws on top then you raise the controlpanel exposing the front screws. Just a guess.
you need to provide a serial number of your computer and model. gp7800 does not say much to lookup that information for you.
in general most towers are secured with plastic tabs that are secured to the chasis of your system. what i suggest is for you to open on of the side panels and check at the back of the front panel if there are tabs securing your front panel. you don't want to force the plastic panel or those tabs as you may brake them if you apply to much force, simply move the tab to unsecure it and check all the tabs had been moved to an unlock position before jiggling with the part in order to remove it... you may also want to look if your system has a top pannel to be removed as removing this top pannel may also release other panels and may also provide acess to latches or tabs on the top part of the front panel that may allow you to unsecure these portion.
I've been trying to obtain general information on your system or any other gateway tower for you to have an idea but given how generic and also how propriatery this instructions may be is unlikely a service manual may be accessible.