Microtek 815C User Manual page 20

Display is
too dark or If the video output level of the computer is within the spec.
too bright.
Display is not
in the center. If the signal timing of the computer is within the spec.
If the power voltage is within the spec.
Display is
shaking.
If the signal timing of the computer is within the spec.
If the signal cable is properly connected.
Display is not
If the signal timing of the computer is within the spec.
synchronized.
If the video output level of the computer is within the spec.
Cable not connected Change Computer Hz
14
Mode Error