This unit is a bit hard on CRT's. After a while the gray scale needs rebiased. It's not adjustable on the CRT board and can be accessed from the front panel control's.

1. Apply a video signal to the monitor. Press and hold the "up and down" buttons and apply power.
2. Wait four seconds and release the buttons.
3. Press the "menu" button 4 times and the "OSD"display reads COLOR BIAS.
4. Press the "enter" button once to index to the red gun. Press "enter" again and the "OSD" disappears. The + and - buttons now control the red gun bias voltage.
5. When finished press "enter". Repeat step three only this time press "enter" twice to index to the green gun. Pressing "enter" three times gets you the blue one.

1. Repeat steps one and two above. Press "menu" button once, then the "up" button eight times. A secret yellow square now appears on the "OSD".
2. Press the "enter" button once and adjust the "new" contrast bar with the + and - buttons.