Abstract: A charge and deflection control type ink jet printer in which at least an ink jet head section, a charging section and a deflecting section are configured in a single replaceable module, or unit. The user of the printer may replace the module without the help of a serviceman. The replaceable unit is further provided with an ink ejection adjusting mechanism, a deflection efficiency adjusting device, an a drive efficiency adjusting device.

Abstract: An edit mode controller for use in editing magnetic tapes using multiple video tape recorders, in which when one of the recorders is placed in a still or pause mode while waiting for the dubbing location on the other tape to be found, prevents damage to the tape by the repeated scanning of the head in the pause mode by detecting the elapse of a predetermined time period and incrementally advacing the tape by a few number of tracks, then placing the recorder back into the pause mode. The control pulses normally found on video tapes are used to both advance the tape the desired increment and also to rewind the tape back to the desired starting point, once the dubbing point on the other tape has been found.