Hello, I have already solved my problem. My problem came from the fact that I created the /etc/printcap properly (for example, using "magicfilter") but I didn't know that, in order to use the new configuration, I had to make the lpd daemon re-read the printcap file. This can be done by executing the "lpc" program first and the "reread" command from its prompt later. To check that the printcap file has been read, execute the command "printcap" from the "lpc" prompt.
Doing this, my printer has work properly. I hope it also works for you. Thanks to every one for their advices because they have allowed me to discard some wrong alternatives during the configuration process. Manuel Arenaz