Komatsu GALEO HM350-2 Operation & Maintenance Manual page 283

ATTACHMENTS, OPTIONS
USE OF REAR VIEW MONITOR
BRIGHT/DIM LIGHT SELECTOR SWITCH
When this switch is pressed, the brightness of the monitor display
lowers.
A mark of "DIM" appears on the upper left side of the display then.
When the switch is pressed again, the brightness returns to the
original level, and "DIM" mark goes off.
MARK SWITCH
The shown mark position does not correspond with the machine.
Do not use this function.
CONTRAST ADJUSTMENT KNOB
With this knob (6), contrast on the monitor display can be adjusted
to be either stronger or weaker.
To side (A): Contrast becomes stronger.
To side (B): Contrast becomes weaker.
BRIGHTNESS ADJUSTMENT KNOB
With this knob (7), brightness (luminance) on the monitor display
can be adjusted.
To side (A): Brightness increases.
To side (B): Brightness decreases.
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