6f5f31d5_Printer_Error_Code_Information__Solutions
[Error Code] Error 939 [Error Message] RIP Communications Lost Controller Engine Communications Lost The controller board and the engine board cannot communicate with one another. [Solutions] 
POR several times Check each board for secure ground. Replace the assys in the following order 1. Controller Board 2. Engine Board 3. Intterconnect Board
Lexmark Printer Error Code Information
Solutions