MFC640 Printer had a paper jam I took the paper out from the back put the cover back on its still flashing paper jam. what should I do?

The light flashing may mean more things, not just a paper jam. Could mean any of the following:
- Front cover is open: Close the front cover of the printer.
- Back cover is open: Close the back cover of the printer.
- Paper jam: Clear the paper jam. To see paper jams and how to clear them, click here. If the printer does not start printing, press the Go button.
- No paper fed manual feed slot: Put the paper back in the manual feed slot.
- Memory full: The printer memory is full and the printer cannot print full pages of a document. To solve this problem, click here.
- Print overrun: A print overrun occurred and the printer cannot print full pages of a document. To solve this problem, go here.
- Drum Error: The corona wire needs to be cleaned. To see how to clean the corona wire, click here.

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Paper light flashing could mean several things on this machine.

There could be a paper jam in the machine. Open the front cover remove the drum and toner and look in the machine. You can also check in between the drum and toner by removing the toner from the drum. Open the back cover and look for a Jam as well.

Try putting a piece of paper in the manual feed tray which is right above the paper tray, sometimes on certain documents the margins are too big and asks to go into the manual feed slot.

Clear the jammed paper as follows.
Observe Cautions signs in printer.
Always remove all paper from the paper tray and straighten the stack when you add new paper. This helps prevent multiple sheets of paper from feeding through the printer at one time and prevents paper jams.
1. Press the cover release button and then open the front cover.
2. Slowly take out the drum unit and toner cartridge assembly. The jammed paper will be pulled out with the drum unit and toner cartridge assembly.
3. Pull the paper tray completely out of the printer.
4. Close the front cover.
5. Pull the jammed paper up and out of the printer.
6. Open the front cover again.
7. Open the back cover.
8. Pull the tabs at the left and right hand sides toward you to open the fuser cover (1).
9. Using both hands, gently pull the jammed paper out of the fuser unit.
10. Close the back cover.
11. Pull the duplex tray completely out of the printer.
12. Pull the the jammed paper out of the printer or the duplex tray. Put the duplex tray back in the printer.
13. Push down the blue lock lever and take the toner cartridge out of the drum unit. Clear the jammed paper if there is any inside the drum unit.
14. Put the toner cartridge back into the drum unit until you hear it lock into place. If you put the cartridge in properly, the blue lock lever will lift automatically.
15. Put the drum unit and toner cartridge assembly back in the printer.
16. Put the paper tray firmly back in the printer.
17. Close the front cover.
18. Make sure that the Paper LED is now off and the printer is ready.
After clearing paper jam if noise persist printer may need a Repair Tech and parts replacement for broken or wore parts.

you have take out zamed paper from the printer from the back side of the printer by ejecting the try from back side if it present. or pull out your tonner and then pull out the zame paper.

If you did not get ALL the jammed sheet out, there is still a small piece of paper in there somewhere, probably covering a sensor or micro switch. Get a torch and look carefully. If youu don't find anything you may need to disassemble the printer to find it

Title:
How do I clear paper jams?
Description:
If a paper jam occurs, the Paper LED will flash as shown below.
Caution

After you have used the printer, some parts inside the printer are extremely hot. When you open the front cover or face-up output tray of the printer, never touch the shaded parts shown below.

1. Remove the paper tray from the printer.

1. Pull the jammed paper up and out of the printer.

1. Open the front cover.

1. Pull out the drum unit and toner cartridge assembly slowly. The jammed paper will be pulled out with the drum unit and toner cartridge assembly.

Caution

To prevent damage to the printer caused by static electricity, do not touch the electrodes shown below.

1. Open the back cover.

1. Pull the tab toward you to open the rear chute cover.

1. Pull the jammed paper out of the fuser unit. If the jammed paper cannot be pulled out easily, push down the tab with one hand as you gently pull the paper out with other.

1. Close the back cover.

1. Push the lock lever down and take the toner cartridge out of the drum unit. Take out the jammed paper if there is any inside the drum unit.

1. Put the toner cartridge into the drum unit until you hear it lock into place. If you put it in properly, the lock lever will lift automatically.

Caution

To avoid print quality problems, DO NOT touch the shaded part shown in the illustration.
If you accidentaly touch the shaded part, wipe the surface with a dry lint-free soft cloth.

1. Put the drum unit and toner cartridge assembly back in the printer.

1. Put the paper tray firmly back in the printer.

1. Close the front cover.
   Make sure that the Paper LED is now off and the printer is ready.

Title:
How do I clear paper jams?
Description:
If a paper jam occurs, the Paper LED will flash as shown below.
Caution

After you have used the printer, some parts inside the printer are extremely hot. When you open the front cover or face-up output tray of the printer, never touch the shaded parts shown below.

1. Remove the paper tray from the printer.

1. Pull the jammed paper up and out of the printer.

1. Open the front cover.

1. Pull out the drum unit and toner cartridge assembly slowly. The jammed paper will be pulled out with the drum unit and toner cartridge assembly.

Caution

To prevent damage to the printer caused by static electricity, do not touch the electrodes shown below.

1. Open the back cover.

1. Pull the tab toward you to open the rear chute cover.

1. Pull the jammed paper out of the fuser unit. If the jammed paper cannot be pulled out easily, push down the tab with one hand as you gently pull the paper out with other.

1. Close the back cover.

1. Push the lock lever down and take the toner cartridge out of the drum unit. Take out the jammed paper if there is any inside the drum unit.

1. Put the toner cartridge into the drum unit until you hear it lock into place. If you put it in properly, the lock lever will lift automatically.

Caution

To avoid print quality problems, DO NOT touch the shaded part shown in the illustration.
If you accidentaly touch the shaded part, wipe the surface with a dry lint-free soft cloth.

1. Put the drum unit and toner cartridge assembly back in the printer.

1. Put the paper tray firmly back in the printer.

1. Close the front cover.
   Make sure that the Paper LED is now off and the printer is ready.

Got the same problem, but in fact it WAS a paper jam. Open both the back panel (can you see the orange roller clearly? If so, no jam) and the front panel. Grab the handle and take out the toner and drum and check there is no paper. Chances are there will be.

Did you see http://www.fixya.com/support/r310860-lights_indicate
The Paper LED is flashing.
Meaning of LED Indication

Front cover is open:
Close the front cover of the printer.

Back cover is open:
Close the back cover of the printer.

Paper jam:
Clear the paper jam. To see paper jams and how to clear them, click here. If the printer does not start printing, press the Go button.

No paper fed manual feed slot:
Put the paper back in the manual feed slot.

Memory full:
The printer memory is full and the printer cannot print full pages of a document. To solve this problem, click here.

Print overrun:
A print overrun occurred and the printer cannot print full pages of a document. To solve this problem, click here.

Clean drum unit:
The corona wire needs to be cleaned. To see how to clean the corona wire, click here.

take off the back cover of printer and check it out for any paper left from the paper jam and then make sure you replace the back cover properly. : )