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Question about IBM Infoprint 1120 Laser Printer

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Invalid Engine Code

I'm getting "Invalid Engine Code" flashing on the printer itself. It';s an Infoprint 1120 - Type: 4520. Anyone know what might fix this? Possibly firmware update but I can't seem to confirm anywhere.

Posted by powergrip on

  • 3 more comments 
  • powergrip Oct 19, 2007

    Thank you for the reply, I did as you said and I was able to get to the screen you mentioned. I did find 4 Engine Code menus and in each one the display read 0* So I hit Select on each one and it said "Saved". I exited the setup and the printer started but with the same error. "Invalid Engine Code" When I went back into the menu I tried to set it to 1 for each engine and I realised that when I selected the new number the * was automaticly put beside it. Is the * supposed to be there or does it mean that there is an error?

  • powergrip Oct 19, 2007

    The choices I had was a number between 0 and 255. I only tested 0 & 1 but either way when selecting either and * was placed beside the number when I saved it. Hence when I would go bacvk into the Engine Code it would display a number and a * beside it. This was the case with all 4 engine codes. The Engine Card is secured in the PCI Slot as well as all wires secured to the card. I am unsure if I should try flashing the firmware but I think I read somewhere that this worked for a diffrent type of Lexmark printer. Only thing is, Lexmark charges for firmware if the item isn't covered by warrenty. Looks like they adopted IBMs handling of firmware.

  • powergrip Oct 22, 2007

    Thank you so much for your help. I have got it working now. Another problem I encountered was that Lexmark & IBM don't like releasing Engine Codes or other firmware. If you go to their site it says you have to contact support to get a code. I did some digging and I found a list of all codes. I have uploaded it to help others.




    What you do is find out what printer you have and what you type of firmware you need. Consult the list and make note of the keycode that applies to you. Then go to the Lexmark Firmware Site and type the keycode into the box that says "Please enter your authorization keycode*". It will then prompt for download.


    Download it and follow the instructions "checkitright" posted to get it installed.



  • powergrip Oct 23, 2007

    I did now. hehe Didn't see the option.

  • tonrey55 Jun 23, 2008

    Do the solutions mentioned in this thread work with an IBM infoprint 1120? The engine codes mentioned are all for Lexmark printers. What Lexmark printer is the equivalent of the IBM Info 1120?


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Does anyone have a source of the authorization codes for the x560n machine? contact me via [email protected]

Posted on Dec 14, 2010


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This is actually a Lexmark printer, so what I'm quoting is a Lexmark sol.

turn off machine

hold down returnand go buttons

turn on printer

hold  until performing test shows and let go of buttons

it will go to a service mode ( instead of saying ready)

got to printer set up

hit select button

go to engine 1,2 or 3


try each one ( hit select to go into that perticular number)

what you are looking for is a number that has an * next to it. Use the arrow keys to scroll. most likely it changed the setting so go and look for that number w/the * and hit select when you see it.

Posted on Oct 18, 2007

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  • CheckitRight
    CheckitRight Oct 19, 2007

    This is what you chose, or what was saved.

    There should have been a lot of numbers and letters in there. I will try to see if you can recover or if you have to replace the engine board.

  • CheckitRight
    CheckitRight Oct 22, 2007

                          TRY THIS


    try to find out what model yours corresponds to a Lexmark then try to input the engine code.


    8491G25L.PJL Engine Code for Lexmark T522
    8491G20L.PJL Engine Code for Lexmark T520
    8491F40L.PJL Engine Code for Lexmark T622
    8491F30L.PJL Engine Code for Lexmark T620
    ENG204.PJL Engine Code for Lexmark W812
    T63xEng550_428.fls Engine Code for Lexmark T63x
    7893B15L.PJL Engine Code for Optra T610
    7893B20L.PJL Engine Code for Optra T612
    7893B25L.PJL Engine Code for Optra T614
    7893B35L.PJL Engine Code for Optra T616
    AE6055_V.PJL Engine Code for Optra S12xx
    AE6055_R.PJL Engine Code for Optra S16xx
    AE6055_S.PJL Engine Code for Optra S1855
    AE6055_L.PJL Engine Code for Optra S24xx
    AE6055_D.PJL Engine Code for Optra S3455


    1. Go to a DOS prompt.
    3. Change directory to that containing Engine Code file(s).
    2. Turn printer on and make sure it is connected and in the Ready state.
    It is also acceptable for the printer to display "Invalid Engine Code."
    4. Type the following command at the DOS prompt:


    press ENTER

    At the ftp> prompt press ENTER and then type:


    press ENTER


    press ENTER

    5. The printer display panel should read "Programming Engine Code"

    NOTE: Do not power off the printer or touch any menus during this

    6. When the printer returns to the Ready state, print the menus.

    Press MENU> or

    Press SELECT.
    Press MENU> or Press SELECT to print a settings page.

    7. Under the Printer Information section, the appropriate updated engine
    code should be displayed.

  • CheckitRight
    CheckitRight Oct 23, 2007

    Nice to know I was able to help.

    Did you mark it as solved ? Thanks


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