Canon MF8180C "In Use/Memory" won't clear

Either you need ink or your cartridge is defective.

Same computer? If not, uninstall software and reinstall.

Generally the "received in memory" message is a result of the machines inability to print. I.E. It received a fax, attempted to print it, failed, and then stored it in memory to print once the issue has been corrected.

The Prepare Black Toner error is likely directly related. If the toner cartridge is empty, inserted incorrectly, or damaged it could be causing this error. Try reseating the cartridge by removing and reinserting. If that doesn't clear the error try replacing it with a new Canon branded cartridge.

As soon as you correct the printing issue the stored faxes will print.

This is usually caused by data within the print job. Microsoft Office sends paper size and job data with each job. Clear all print jobs in the computer sending the job.(Start/Printers/double click the canon printer and delete all jobs in the print que. Clear the Canon by off/on. Open a program and print a standard letter size document to test. This can be corrected by going to the page/document setup choices under "File" or the Ball in MS Office. Usually this is set to A4 or Bypass by mistake within the application.
Thanks

You include no details about your fax machine.

However, Are your faxes from paper copies only? Do you have to print them out to fax them.?
IF SO.. then you should use a PC fax card, to fax directly from a PC. If you have hard copy only, then the addition of a scanner, with a document feeder to speed things up, will enable you to do same thing. Should be able to que up all the faxes and walk away.

Press MENU and # - this is service mode.Find CLEAR, and OK, then select clear ALL. After that fax returns to factory sett.
You will need to reenter your settings, but it should work.

most fax machines will show receiving memory left or transmit memory left, if it showing receiving memory full make sure there are no paper jams and there is lots of paper in paper cassettes and it will start to print all the faxes in memory... if its transmit memory, you will need to clear those documents in memory to be sent, probably waiting in que....

The fax automatically turns off Auto Print and stores faxes in memory when either ink or paper is low. The memory will store up to 30 transmissions or 60 pages maximum, so it is important not to leave this too long if you have heavy transmission volume.

Faxes can be retrieved as follows.

If you want to choose only certain faxes to print:
1. Print a list of documents in memory for reference:
Press Menu. Use arrows (up & down) to select Memory Reference, then press Start/Copy. Use the arrows to select Doc Memory List, and again press Start/Copy.
2. Print a document from memory (using the list printed in #1):
Press Menu. Use arrows (up & down) to select Memory Reference, then press Start/Copy. Use the arrows to select Print Document, and again press Start/Copy. The LCD will show the first number in memory (e.g., TX/RX NO. 0001).

Use the arrows to choose the document you want to print, and press Start/Copy. The LCD will then toggle between "1st page only?" and "Yes=(*) No=(#)". Press * to print only the first page, or # to print all pages.
3. Delete selected document(s) from memory:
Press Menu. Use arrows (up & down) to select Memory Reference, then press Start/Copy. Use the arrows to select Delete Doc, and again press Start/Copy. The LCD will show the first number in memory (e.g., TX/RX NO. 0001).

Use the arrows to choose the document you want to delete, and press Start/Copy. [Note - if the arrows do not result in another number displaying, there is only one document in memory.] The LCD will show "Yes=(*) No=(#)". Press * to delete the document. Continue to select documents until each document you want to delete has been handled.

If you want to print all unprinted documents in memory:
1. If you want to have a list of documents in memory for reference before performing this procedure, to be sure you have them all, follow step 1 from the above procedure for printing selected documents.]
2. Press Menu. Use arrows (up & down) to select Memory Reference, then press Start/Copy. Use the arrows to select Print All New RX, and again press Start/Copy.
3. Delete all printed docs from memory:
Immediately after printing all documents, you will have the choice of deleting all documents. The LCD will display "Yes=(*) No=(#)". Press * delete all, or # to retain in memory.

To delete all documents at a later time:
Press Menu. Use arrows (up & down) to select Memory Reference, then press Start/Copy. Use the arrows to select Delete Printed RX, and again press Start/Copy. The LCD will display "Yes=(*) No=(#)". Press * delete all, or # to retain in memory. To finish then, press Stop.

If you need further assistance, please post back. Otherwise, thank you for using and rating FixYa!

printing over a network. make sure you have the correct port forwarding open and that you haven't locked access to router to the printer.

Canon Error Codes
L5000,5500,7000,8000: To enter service mode Data Registration, #, Ram Clear is under #8 clear
Faxphone 20 ram clear
Turn off the power switch
Turn off the memory protect switch (located on the bottom of the machine)
Turn the power on
Press function # 2 0 start
Turn the power switch off
Turn on the memory protect switch
Fax L770 fuser gear wears out easily under heavy usage. White gear with 2 sets of teeth.
Inkjet models such as the B160 will hold faxes in memory and refuse to print if excess ink has accumulated on the pad under the cartridge's nose. Remove the cartridge and wipe up excess ink with a cotton swab.