IBM 4230 User Guide - Page 305

not ready. A state where you have pressed Stop or an error or operator intervention condition is occurring. The printer can be not ready and online or offline. See also offline and online. Contrast with ready. O offline. Pertaining to equipment or devices not under control of a control unit or host processor. Contrast with online. online. (1) Stored in a computer and accessible from a terminal. (2) Pertaining to equipment or devices under the direct control of a control unit or host processor. Contrast with offline. operator panel. A functional unit containing switches used to control a printer or other data processing units, or a portion of these devices that may contain indicators giving information on the functioning of the system. P paper door. Used to provide access to the printer for loading paper and forms devices. paper jam. A condition in which paper forms have not fed properly during printing and have become wedged in the feeding or printing mechanism, thus preventing the correct forward movement of the forms. A paper jam usually causes one line to be printed over one or more other printed lines. parallel interface. An interface where data is exchanged between the computer and the printer one byte at a time. partial reset. An action that returns the printer to the current configuration values. platen. A backing, usually cylindrical, against which printing mechanisms strike or otherwise deposit ink to produce an image. power cord. Cable that carries the main power supply between a room outlet and a machine. power-on custom set. The custom set containing the values used to set the printer parameters when the printer is turned on. power-on self test. A series of diagnostic tests that are run automatically by a device when the power is turned On (|). power switch. A device that makes and breaks the contact between equipment and the main electricity supply. print head. That part of the printer that prints data. print head carrier. Used to hold the print head and ribbon guide posts as they slide along the platen. print quality. The quality of printed output relative to existing standards Glossary X-5