Sharp 20LK61M Service Manual - Page 6

20LK31M 20LK61M 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 adjusment is required. 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. 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 control are in their proper (reset) position. 2. Service number selection. In the service mode, you will see the window screen as window 1. There are 3 adjustment categories 2DEF, 3SIGNAL, 4FIX VALUE as show in Figure A. Window 2: DEF D01 D02 D03 D04 D05 D06 RETURN DEF SIGNAL Window 3: SIGNAL S01 S02 S12 S13 RETURN RETURN Window 1: ADJUSTMENT Categories SERVICE MODE DEF SIGNAL FIX VALUE EEPROM RETURN RETURN FIX VALUE Window 4: FIX VALUE F01 F02 NEXT F13 RETURN F14 NEXT PREVIOUS F15 F16 F25 F26 RETURN PREVIOUS Figure A: Adjustment Categories Press CH UP/DOWN button for selection and enter by VOL UP or VOL DOWN. Press CH UP/DOWN button to select the adjustment item and VOL UP/DOWN to adjust the data number for each categories. (OSD disturbance can be erased by R/C display key) (Note: EEPROM - factory used only) 6