Sharp 19C140 Service Manual - Page 6

19C140 For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit. Note: There are still a few analog adjustments in this series such as focus and master screen voltage. Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if service adjustments are required. 1. Service mode Before putting unit into the service mode, check that customer adjustments are in the normal mode. Use the reset function in the video adjustment menu to ensure customer controls are in their proper (reset) position. 2. Service number selection Once in the service mode, press the Ch-up or Chdown button on the remote controller or at the set. The service adjustment number will vary in increments of one, from "S01" to "OP". Select the item you wish to adjust. 3. Data number selection Press the Vol-up or down button to adjust the data number. To enter the service mode and exit service mode. While pressing the Vol-up and Ch-up buttons at the sametime, plug the AC cord into a wall socket. Now the TV set is switched on and enters the service mode. To exit the service mode, turn the television off by pressing the power button. DATA NUMBER SERVICE ADJUSTMENT NUMBER CHANNEL S01 55(085) 02 S01 D:00 Figure A. 6