User manual OKI LE840DT USER GUIDE

[. . . ] LE840/LE850 User’s Guide PREFACE Every effort has been made to ensure that the information in this document is complete, accurate, and up-to-date. The manufacturer assumes no responsibility for the results of errors beyond its control. The manufacturer also cannot guarantee that changes in software and equipment made by other manufacturers and referred to in this manual will not affect the applicability of the information in it. Mention of software products manufactured by other companies does not necessarily constitute endorsement by the manufacturer. [. . . ] 4V (default) after the power is turned OFF then ON. > When you perform a threshold setting for the Transmissive sensor (Gap sensor) and found the threshold needs to be adjusted, set a fine adjustment value. This menu is accessible directly from the Threshold Setting Mode so that the threshold can be manually set right away. 10 Threshold Setting To maintain a constant print position the printer uses the media sensor to detect a print start position according to the difference of voltage between a print area and a gap or black mark. When the media is pre-printed, the darker (or more dense) inks can interfere with this process causing paper jam errors. To get around this problem, first, try an automatic threshold setting. If the problem still occurs, then, the threshold voltage needs to be fine adjusted. Threshold is a voltage level by which the printer determines whether a print area or a gap/a black mark is being detected by the media sensor. The threshold is a boundary between a print area and a gap/black mark, and should be a midpoint of their voltage levels. Power ON Power OFF ONLINE Mode [PAUSE] PAUSE state Hold down [PAUSE] Threshold Setting Mode • • Reflective sensor (Black mark sensor) Transmissive sensor (Gap sensor) (1) Load the media to be used. (2) Choose 1) or 2) depending on the sensor type to be used, then press the [ENTER]. Ensure that a paper end or ribbon end error will not occur during paper feed. (3) Hold down the [PAUSE] until more than 1. The media will continue to be fed until the [PAUSE] is released. (An automatic threshold setting for the selected sensor is completed by this operation. ) Display example 1 2 3 NOTE: To make a threshold value set in this section effective, select the Transmissive Sensor (when using pre-printed media) or Reflective Sensor (when using manual threshold value) in Issue Command or the printer driver. 4 5 6 Explanation Result: OK (Mid. ) Threshold is at the midpoint between the peak and the baseline. Result: OK (High) Threshold is near the peak voltage, so detection of a gap/black mark may fail if the voltage difference is very small. Adjusting the threshold to the midpoint between the peak and the baseline enables more accurate detection. Follow next (5) to (10) Result: OK (Low) Threshold is near the baseline voltage, so detection of a gap/black mark may fail if the voltage difference is very small. Adjusting the threshold to the midpoint between the peak and the baseline enables more accurate detection. [. . . ] These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and set in accordance with the instruction manual, may cause harmful interference to radio communications. Operations of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. (for USA only) Changes or modifications not expressly approved by the manufacturer for compliance could void the user’s authority to operate the equipment. [. . . ]