User guide Troubleshooting115Paper jam. ` Eliminate the paper jam detec-ted by the paper motion sensor.For the procedure, see Paperjam (fanfold paper), (page 111)or Paper jam (single sheets),(page 112).Top cover is open. ` Close the top cover.Internal hardware error. ` Try switching off and on.` Check if changes to optionshave been previously carriedout.` Note down the display messa-ge. Contact your dealer.Transmission error from computerto printer via the optional serialinterface.` Compare the interface configu-ration of your printer with thesettings of your computer (pro-tocol), see Interfaces,(page 157).` Check the cable, if necessaryreplace it.` The cable exceeds the maxi-mum allowed length, see Inter-face specifications, (page 127).Transmission error (serial inter-face).` Compare the format setting ofyour printer with the setting ofyour computer.` Check the permissible cablelength, see Interface specificati-ons, (page 127).` See parity error.Message Possible cause Corrective actionPaper JamCover openHardware AlarmParity ErrorFrame Error
