Hatteland Display 20 inch - HM 20T07 CMD - Manual (Page 27)

27 Operation
IND100064-22
User Controls
EXTENDED FUNCTIONALITY:
The unit features a BITE function button and INV Indicator LED.
BITE SWITCH INV Indicator LED
No function No function
B ITE SWITCH:
The test picture is designed to easily discover image errors in the unit. When the BITE button is pressed and held
down for a couple of seconds, the unit will display a test picture and perform an extended self test. The test picture is
displayed for 10 seconds, during which time the display will be unresponsive to other signal sources and key presses.
(Note: If MENU button is pressed the test picture will disappear, but the unit will still be unresponsive for the remaining
test cycle).
The image is generated internally in the display controller, and does not rely on any other external signal sources.
The brightness of the panel is automatically adjusted to 100% during the test and will reset back to its initial value as
defined before the test was initiated. The results of the last extended self test is stored in the unit. If there are image
defects in the test pattern, these are generated in the display itself, and are not affected by any other signal inputs.
To exit from the test sequence after its 10 second test cycle, press the MENU button.
INV INDICATOR:
The INV led indicator alarm will only illuminate red when there is a problem with the backlight control logic which
means that it uses a fault segmented backlight system where parts of the system can fail witout causing critical
degrading of the performance of the display. If there is a critical error in the backlight driver the maximum light output
will be cut in half and the display will be slightly darker in the upper or lower section. Since the human eye have a very
non-linear response to light, this can be difficult to see.