When I fax it prints a paper saying document jammed but there is none jammed and I cant receive a fax

Is there a small piece of paper over the paper jam sensor?

If the memory is filled up when a fax is received ... when there's no paper, or it is jammed (so that it can't print) ... you can print the fax (in Memory, after putting in new paper, or fixing the jam) by pressing the START/MEMORY button. After it prints, the memory is cleared.

If the memory is filled up when you're scanning and storing a document into memory (to be fax out), press the START/MEMORY key to transmit the pages that's already in memory. After transmitting the content in memory, the memory will be cleared/emptied. You'll need to scan the remaining pages to transmit (as a separate fax)

to clear document jam:
1 Open the front panel.
2 Carefully remove the jammed document.
3 Close the front panel firmly until it clicks
into place.

If the fax paper jams while you are receiving or printing, Remove jammed paper and press
Cancel appears in the message.

if the paper is jammed in the printing area
1 Remove the jammed paper by pulling it out
smoothly in the direction of the arrow as
shown.
If the paper tears when it is being removed
check to ensure that no small pieces have
been left inside the machine.
2 Press Cancel.
3 If this was a fax, reprint the fax. For more
information, see reprinting faxes on
page 29.

if the paper is jammed in the paper feed
area
1 Remove the jammed paper as shown.
If the paper tears when it is being
removed check to ensure that no small
pieces have been left inside the machine.
2 Reload new paper with the print side
facing toward you.
3 Press Cancel when finished.

1. Issue: How do I print a document stored in memory?
   Solution: Print the received fax from memory - MX310
   Memory Reference Print faxes received from memory when ink is low or paper has run out or paper has jammed. It may be necessary to press to clear the error then attempt to print the fax from memory.
   1. Press , then press . [FAX SETTINGS] will appear at the top row.
      
      
   2. Use to select [MEMORY REFERENCE].
      
      
   3. Press .
      
      
   4. Use to select [PRINT DOCUMENT] or [DELETE DOCUMENT].
      
      If you select [PRINT DOCUMENT]:
      
      1. Press .
         
      2. Use to select the transaction number (TX/RX NO.) of the document you want to print, or enter the number using the numeric buttons. If you are unsure of the transaction number, print the MEMORY LIST
         Press .
         
      3. Use[ ] to select to print the first page only, or use [ ] to select to print all pages of the document. (Received faxes begin at 5001. Faxes waiting to be transmitted start at 0001.)
         
      4. Press .
         
      5. To print another document, return to step 4b, or to finish printing, go to step 5.
         
         If you select [DELETE DOCUMENT]:
         
      6. Press .
         
      7. Use to select the transaction number (TX/RX NO.) of the document you want to delete, or enter the number using the numeric buttons.
         
      8. Press .
         
      9. Use [ ] to select to delete document, or use [ ] to select not to delete the document.
         
      10. Press . To delete another document, return to step 4g, or to finish deleting, go to step 5.
          
          
   1. Press .
      

check the gears in the adf maybe you have one that is misaligned ,run a piece of paper following the paper path check the flag sensor make sure none of them is jammed close or misaligned.
Good luck

Your document feed is separate from your received and report prints so that's why your reports are printing ok and the document feeder jams. When you open up the doc feeder and look inside the machine you will see a roller and above it on the cover that opens you will see a rubber pad. Clean both the roller and pad (in fact anything in there that is rubber) with a rubber cleaner, alcohol, or even soap and water on a cloth without it been dripping wet. You will probablt find that they are very dirty. The roller feeds the document in so that needs to be clean and the pad helps to keep all the other docs from feeding in at the same time and that should be very clean so it produces good friction.

when fax gives msg ,fax in memory,just remove jammed paper .put fresh papers in tray.if the msg is coming on screen that fax in memory just press START key.there is a green button labeled as fax start .u will receive all faxes in memory.MIAN AKHLAQ .do not forget to rate the solution.

The memory is full of received documents due to a
lack of recording paper, a lack of ink film or a
recording paper jam. Install paper (page 13), install
ink film (page 11) or remove the jammed paper
(page 63).
the entire manual here http://service.us.panasonic.com/OPERMANPDF/KXFG2451.PDF#page=53

Memory Reference Print faxes received from memory when ink is low or paper has run out or paper has jammed. It may be necessary to press <Stop/Reset> to clear the error then attempt to print the fax from memory.

1. Press <FAX>, then press <Menu>. [FAX SETTINGS] will appear at the top row.
   
   
2. Use to select [MEMORY REFERENCE].
   
   
3. Press <OK>.
   
   
4. Use to select [PRINT DOCUMENT] or [DELETE DOCUMENT].
   
   If you select [PRINT DOCUMENT]:
   
   1. Press <OK>.
      
   2. Use to select the transaction number (TX/RX NO.) of the document you want to print, or enter the number using the numeric buttons. If you are unsure of the transaction number, print the MEMORY LIST
      Press <OK>.
      
   3. Use[ ] to select <YES> to print the first page only, or use [ ] to select <NO> to print all pages of the document. (Received faxes begin at 5001. Faxes waiting to be transmitted start at 0001.)
      
   4. Press <OK>.
      
   5. To print another document, return to step 4b, or to finish printing, go to step 5.
      
      If you select [DELETE DOCUMENT]:
      
   6. Press <OK>.
      
   7. Use to select the transaction number (TX/RX NO.) of the document you want to delete, or enter the number using the numeric buttons.
      
   8. Press <OK>.
      
   9. Use [ ] to select <YES>to delete document, or use [ ] to select <NO> not to delete the document.
      
   10. Press <OK>. To delete another document, return to step 4g, or to finish deleting, go to step 5.
       
       

1. Press <Stop/Reset>.
   

showing paper jam and have checked and don't see any paper