Printer won't close

I understand that your WF 7620 can't recognize your ink, here's a tutorial which might help with this:
Solved Epson printer doesnt recognize Ink Cartridge

Sometimes the ink cartridge carrier won't automatically move to its loading position even when the printer is on and the cover is open. Follow the steps below:

1. Unplug the printer from the power source.

2. With the cover open, hold the solid white strip that connects from the carrier assembly to the ink cartridge carrier and gently slide the cartridge carrier to the center of the printer.

3. Remove the used cartridges.

4. Load the new cartridges. Close the cover.

5. Plug the printer back to the power source.

try to fix the cartridge or ink properly, it could be that the cable is fasten.

There are a couple reasons a pen refill won't start writing right away. The first thing to check is the tip--often there is a bit of glue or plastic over it in order to prevent leaking.
If that doesn't work, then try one (or both) of the following two methods:
1) Place the refill (but not the tip) in some warm water. Heat will allow the liquid in the gel pen to become thinner and flow more naturally.
2) Hook a rubber band around the middle of the pen, using tape to ensure safety, and wind the pen while holding the rubber band on either side of the pen. Make sure the cap is on the pen. When the rubber band is tight, when you pull straight out on the rubber band from both sides of the pen, it should spin very quickly. The centripetal force will cause the liquid in the pen (at least half of it) to move toward the tip.
Make sure you fasten the rubber band to the pen with tape or something similar; otherwise the pen may go flying off at someone nearby. Also, again, make sure the cap is on to prevent any ink spraying out--this is unlikely in a gel pen, but it could happen.

What is the version of your ink cartridge? It could be that it's not seated properly in the cartridge carrier. Open the printer cover and remove the cartridges. Close the cover. Unplug and replug the printer into the power outlet in the wall to reset it. When the printer turns on, open the printer cover and reinsert one cartridge first. Close the cover. If no error, open the printer cover and reinsert the other cartridge. Replace whichever cartridge is causing the error to appear. You could also try to insert a different known working cartridge to determine if the other is faulty.

Installing/Replacing your ink cartridges:
1. Open the printer, and then press down on the cartridge carrier levers.

2. Remove the used print cartridge or cartridges. 3. If you are installing new print cartridges, remove the tape from the back and bottom of the color cartridge, insert the cartridge in the right carrier, and then close the color cartridge carrier lid. 4. If a black cartridge is included in the box contents, remove the tape from the back and bottom of the black cartridge, insert the cartridge in the left carrier, and then close the black cartridge carrier lid. 5. Close the printer.

Sometimes the ink cartridge carrier won't automatically move to its loading position even when the printer is on and the cover is open. Follow the steps below:

1. Unplug the printer from the power source.

2. With the cover open, hold the solid white strip that connects from the carrier assembly to the ink cartridge carrier and gently slide the cartridge carrier to the center of the printer.

3. Remove the used cartridges.

4. Load the new cartridges. Close the cover.

5. Plug the printer back to the power source.

Since the problem changed when you did the ink cart replacement, is it possible that you neglected to do something --- normally all you do on installation is to remove the tape present to protect the pins on the cart; other than that, there is not much to be done. If the same thing happens with multiple catrtidges make sure you are using the correct cartridges, and that the cartridges are properly fastened down, hard not to if it clicks it is in right. Procedures say to do an alignment after replacement and that is done automatically. Prescence or lack of printing is only a factor of ink being in the cartridge.

yes you can repair it from vendor.

Throttle Position Sensor Replacement

1. Disconnect the negative battery cable.
2. Remove the generator.
3. Disconnect the throttle position (TP) sensor electrical connector.
4. Remove the TP sensor attaching screws
5. Remove the TP sensor
   
6. Remove the TP sensor O-ring seal
   

Installation Procedure

1. Install the TP sensor O-ring seal (7) on the TP sensor (6).
2. Install the TP sensor on the throttle body with the throttle valve in the closed position. Make sure the TP sensor lever lines up with the TP sensor drive lever on the throttle shaft.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the TP sensor attaching screws (5).
Tighten
Tighten the screws to 2 N·m (18 lb in).

4. Connect the TP sensor electrical connector.
5. Install the generator.
   
6. Connect the negative battery cable.

The part has been broken in my printer for over a year now. I hold the cartridge in with a rubber band.