![]() ![]() Turn the SUB-BRIGHT control (VR202) all the way down Use Display Service Utility to display the Full Black Screen test pattern. Set the contrast knob to maximum and the brightness knob to the center (detent) position. Make sure the prong with the ground tab is in the ground receptacle.Ĥ Switch on the monitor and let it warm up for at least 10 minutes.ĥ Attach the ground clip from the high-voltage probe to the metal chassis. Use only a high-voltage probe that meets these specifications:Ģ Switch on the voltmeter power and set the voltmeter to the 2 VDC (or lowest) setting.Ĭonnect the high-voltage probe two-pronged connector to the ground and voltage receptacles on the voltmeter. Note: Performing the screen voltage adjustment requires a voltmeter and a high-voltage probe ( Apple service part number 076-0392).ġ Caution: Using a high-voltage probe other than Apple part number 076-0392 could damage the monitor. You have replaced the CRT/yoke assembly with a different revision CRT/ yoke assembly.You have inadvertently altered the screen adjustment.You have replaced the main deflection board.Note: Perform the screen voltage adjustment only if one or more of the following conditions apply: Note: The look and operation of buttons and jacks on voltmeters vary. If you have not replaced the main deflection board, go to the Geometry adjustments. Note: If you have replaced the main deflection board, you must perform the screen adjustments prior to performing other adjustments. Do not reach around the computer to adjust the controls. To prevent serious injury, review CRT safety in Bulletins/Safety.Īwarning: Because adjustments are made from the rear of the computer, position a mirror to view the computer screen. Awarning: This product contains high voltage and a high-vacuum picture tube.
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