Epson LQ-950 User Manual - Page 221

4. Secure the upper case with the two retaining screws. 5. Replace all parts and options you removed earlier. WARNING: Before you use the optional interface board, be sure to disconnect the interface cable for the printer's built-in parallel or serial interface. Two interface cables must not be installed at the same time. #8143 New Serial Interface If you are using an optional interface, it may be necessary for you to alter the communication protocol of the printer or the computer so that they can communicate properly. In most cases, you should use the information in your optional interface manual or your computer's manual to match the computer with the interface. If you are using the #8143 optional interface board, make sure that you read through the section below on baud rate selection. You may also want to see the sections on handshaking timing and error handling for interface information specific to the printer. Using the Printer Options 5-65