Also check to see if there is a media type specification. If its seeking 8 1/2 x 11 letterhead, and you have loaded 8 1/2 x 11 plain it may not accept the substitution. Also enable auto tray switching. For printing it's defaulted to off (R1,0

. Send this command from KM-Net Viewer:
!R! FRPO R1,99; EXIT;
=^..^=