Instrument and display lighting (MIU2)
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Instrument and display lighting (MIU
2)
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The intensity of certain lamps in the main instrument display panel is controlled
by the SID unit via pins 3 and 4. There are three different intensity levels:
Rheostat
The rheostat is connected to the SID unit which sends the rheostat setting to the main
instrument display panel via pins 3 and 4. The rheostat also controls the following instrument
lighting when it is dark:
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Tachometer (rev counter)
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Light intensity in the cabin
The light sensor is mounted in the SID unit which sends a light intensity signal to the
main instrument display panel via pins 3 and 4. When light intensity exceeds a certain level,
the following instrument lighting will be extinguished:
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Tachometer (rev counter)
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Turbo pressure gauge
Similarly, the intensity of the indicator and warning lamps below changes when
the light intensity in the cabin drops below a certain level. Low intensity in the dark and high
intensity in daylight. All these lamps are grounded in the main instrument display panel.
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LH direction indicators repeater
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RH direction indicators repeater
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CRUISE
The intensity of the following lamps also changes in daylight and in the dark but
they all receive a +15 power supply from the main instrument display panel and are
grounded in the main instrument display panel's control module:
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Display lighting
The SID unit calculates a suitable display lighting intensity on the basis of the rheostat
setting and the light intensity in the cabin, which is obtained from the light sensor.
When it is dark, display lighting is controlled by the rheostat setting and as it gets lighter
it is controlled by the light intensity in the cabin.
This ensures that the displays will be easy to read in all conditions of light. The following
lamps are controlled by the intensity of the display lighting in the main instrument display
panel:
