Akai PDP4290 Owner's Instructions Manual page 56

Frequency Adjustment
Preset:
• Press the RGB button to select the PC mode.
Press the Menu button. Move the joystick up or
down to select "SETUP", then press the joystick to
enter.
Move thejoystick up or down to select "Image
lock", then move thejoystick left or right to enter.
Remove picture noise (vertical stripes on the screen
by moving thejoystick left or right.
(If frequency is not set properly, vertical stripes
wiJJ appear on the screen.)
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Press the Menu button to exit,
56